NAME
Config - access Perl configuration information
SYNOPSIS
use Config; if ($Config{usethreads}) { print "has thread support\n" } use Config qw(myconfig config_sh config_vars config_re); print myconfig(); print config_sh(); print config_re(); config_vars(qw(osname archname));
DESCRIPTION
The Config module contains all the information that was available to
the Configure
program at Perl build time (over 900 values).
Shell variables from the config.sh file (written by Configure) are
stored in the readonly-variable %Config
, indexed by their names.
Values stored in config.sh as 'undef' are returned as undefined
values. The perl exists function can be used to check if a
named variable exists.
- myconfig()
- config_sh()
- config_re($regex)
- config_vars(@names)
Returns a textual summary of the major perl configuration values.
See also -V
in "Switches" at perlrun.
Returns the entire perl configuration information in the form of the original config.sh shell variable assignment script.
Like config_sh() but returns, as a list, only the config entries who's names match the $regex.
Prints to STDOUT the values of the named configuration variable. Each is printed on a separate line in the form:
name='value';
Names which are unknown are output as name='UNKNOWN';
.
See also -V:name in "Switches" at perlrun.
EXAMPLE
Here's a more sophisticated example of using %Config:
use Config; use strict; my %sig_num; my @sig_name; unless($Config{sig_name} && $Config{sig_num}) { die "No sigs?"; } else { my @names = split ' ', $Config{sig_name}; @sig_num{@names} = split ' ', $Config{sig_num}; foreach (@names) { $sig_name[$sig_num{$_}] ||= $_; } } print "signal #17 = $sig_name[17]\n"; if ($sig_num{ALRM}) { print "SIGALRM is $sig_num{ALRM}\n"; }
WARNING
Because this information is not stored within the perl executable itself it is possible (but unlikely) that the information does not relate to the actual perl binary which is being used to access it.
The Config module is installed into the architecture and version specific library directory ($Config{installarchlib}) and it checks the perl version number when loaded.
The values stored in config.sh may be either single-quoted or
double-quoted. Double-quoted strings are handy for those cases where you
need to include escape sequences in the strings. To avoid runtime variable
interpolation, any $
and @
characters are replaced by \$
and
\@
, respectively. This isn't foolproof, of course, so don't embed \$
or \@
in double-quoted strings unless you're willing to deal with the
consequences. (The slashes will end up escaped and the $
or @
will
trigger variable interpolation)
GLOSSARY
Most Config variables are determined by the Configure
script
on platforms supported by it (which is most UNIX platforms). Some
platforms have custom-made Config variables, and may thus not have
some of the variables described below, or may have extraneous variables
specific to that particular port. See the port specific documentation
in such cases.
_
_a_exe_o
From Unix.U:
This variable defines the extension used for ordinary library files. For unix, it is .a. The . is included. Other possible values include .lib.
From Unix.U:
This variable defines the extension used for executable files.
DJGPP
, Cygwin and OS/2 use .exe. Stratus VOS
uses .pm.
On operating systems which do not require a specific extension
for executable files, this variable is empty.
From Unix.U:
This variable defines the extension used for object files. For unix, it is .o. The . is included. Other possible values include .obj.
a
afsafsrootalignbytesansi2knraphostnameapi_revisionapi_subversionapi_versionapi_versionstringararchlibarchlibexparchname64archnamearchobjsasctime_r_protoawk
From afs.U:
This variable is set to true
if AFS
(Andrew File System) is used
on the system, false
otherwise. It is possible to override this
with a hint value or command line option, but you'd better know
what you are doing.
From afs.U:
This variable is by default set to /afs. In the unlikely case this is not the correct root, it is possible to override this with a hint value or command line option. This will be used in subsequent tests for AFSness in the Perl configure and test process.
From alignbytes.U:
This variable holds the number of bytes required to align a double-- or a long double when applicable. Usual values are 2, 4 and 8. The default is eight, for safety.
From ansi2knr.U:
This variable is set if the user needs to run ansi2knr. Currently, this is not supported, so we just abort.
From d_gethname.U:
This variable contains the command which can be used to compute the host name. The command is fully qualified by its absolute path, to make it safe when used by a process with super-user privileges.
From patchlevel.U:
The three variables, api_revision, api_version, and
api_subversion, specify the version of the oldest perl binary
compatible with the present perl. In a full version string
such as 5.6.1, api_revision is the 5
.
Prior to 5.5.640, the format was a floating point number,
like 5.00563.
perl.c:incpush() and lib/lib.pm will automatically search in
$sitelib/.. for older directories back to the limit specified
by these api_ variables. This is only useful if you have a
perl library directory tree structured like the default one.
See INSTALL
for how this works. The versioned site_perl
directory was introduced in 5.005, so that is the lowest
possible value. The version list appropriate for the current
system is determined in inc_version_list.U.
XXX
To do: Since compatibility can depend on compile time
options (such as bincompat, longlong, etc.) it should
(perhaps) be set by Configure, but currently it isn't.
Currently, we read a hard-wired value from patchlevel.h.
Perhaps what we ought to do is take the hard-wired value from
patchlevel.h but then modify it if the current Configure
options warrant. patchlevel.h then would use an #ifdef guard.
From patchlevel.U:
The three variables, api_revision, api_version, and
api_subversion, specify the version of the oldest perl binary
compatible with the present perl. In a full version string
such as 5.6.1, api_subversion is the 1
. See api_revision for
full details.
From patchlevel.U:
The three variables, api_revision, api_version, and
api_subversion, specify the version of the oldest perl binary
compatible with the present perl. In a full version string
such as 5.6.1, api_version is the 6
. See api_revision for
full details. As a special case, 5.5.0 is rendered in the
old-style as 5.005. (In the 5.005_0x maintenance series,
this was the only versioned directory in $sitelib.)
From patchlevel.U:
This variable combines api_revision, api_version, and api_subversion in a format such as 5.6.1 (or 5_6_1) suitable for use as a directory name. This is filesystem dependent.
From Loc.U:
This variable is used internally by Configure to determine the
full pathname (if any) of the ar program. After Configure runs,
the value is reset to a plain ar
and is not useful.
From archlib.U:
This variable holds the name of the directory in which the user wants to put architecture-dependent public library files for $package. It is most often a local directory such as /usr/local/lib. Programs using this variable must be prepared to deal with filename expansion.
From archlib.U:
This variable is the same as the archlib variable, but is filename expanded at configuration time, for convenient use.
From use64bits.U:
This variable is used for the 64-bitness part of $archname.
From archname.U:
This variable is a short name to characterize the current architecture. It is used mainly to construct the default archlib.
From Unix.U:
This variable defines any additional objects that must be linked in with the program on this architecture. On unix, it is usually empty. It is typically used to include emulations of unix calls or other facilities. For perl on OS/2, for example, this would include os2/os2.obj.
From d_asctime_r.U:
This variable encodes the prototype of asctime_r.
It is zero if d_asctime_r is undef, and one of the
REENTRANT_PROTO_T_ABC
macros of reentr.h if d_asctime_r
is defined.
From Loc.U:
This variable is used internally by Configure to determine the
full pathname (if any) of the awk program. After Configure runs,
the value is reset to a plain awk
and is not useful.
b
baserevbashbinbinexpbisonbyaccbyteorder
From baserev.U:
The base revision level of this package, from the .package file.
From Loc.U:
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
From bin.U:
This variable holds the name of the directory in which the user wants to put publicly executable images for the package in question. It is most often a local directory such as /usr/local/bin. Programs using this variable must be prepared to deal with ~name substitution.
From bin.U:
This is the same as the bin variable, but is filename expanded at configuration time, for use in your makefiles.
From Loc.U:
This variable is used internally by Configure to determine the
full pathname (if any) of the bison program. After Configure runs,
the value is reset to a plain bison
and is not useful.
From Loc.U:
This variable is used internally by Configure to determine the
full pathname (if any) of the byacc program. After Configure runs,
the value is reset to a plain byacc
and is not useful.
From byteorder.U:
This variable holds the byte order in a UV
. In the following,
larger digits indicate more significance. The variable byteorder
is either 4321 on a big-endian machine, or 1234 on a little-endian,
or 87654321 on a Cray ... or 3412 with weird order !
c
ccastflagscatcccccdlflagsccdlflagsccflagsccflags_uselargefilesccnameccsymbolsccversioncf_bycf_emailcf_timecharsizechgrpchmodchownclocktypecommcompresscontainscpcpiocppcpp_stuffcppccsymbolscppflagscpplastcppminuscppruncppstdincppsymbolscrypt_r_protocryptlibcshctermid_r_protoctime_r_proto
From n.U:
This variable contains the \c string if that is what causes the echo command to suppress newline. Otherwise it is null. Correct usage is $echo $n "prompt for a question: $c".
From d_castneg.U:
This variable contains a flag that precise difficulties the compiler has casting odd floating values to unsigned long: 0 = ok 1 = couldn't cast < 0 2 = couldn't cast >= 0x80000000 4 = couldn't cast in argument expression list
From Loc.U:
This variable is used internally by Configure to determine the
full pathname (if any) of the cat program. After Configure runs,
the value is reset to a plain cat
and is not useful.
From cc.U:
This variable holds the name of a command to execute a C compiler which
can resolve multiple global references that happen to have the same
name. Usual values are cc
and gcc
.
Fervent ANSI
compilers may be called c89
. AIX
has xlc.
From dlsrc.U:
This variable contains any special flags that might need to be
passed with cc -c
to compile modules to be used to create a shared
library that will be used for dynamic loading. For hpux, this
should be +z. It is up to the makefile to use it.
From dlsrc.U:
This variable contains any special flags that might need to be passed to cc to link with a shared library for dynamic loading. It is up to the makefile to use it. For sunos 4.1, it should be empty.
From ccflags.U:
This variable contains any additional C compiler flags desired by the user. It is up to the Makefile to use this.
From uselfs.U:
This variable contains the compiler flags needed by large file builds and added to ccflags by hints files.
From Checkcc.U:
This can set either by hints files or by Configure. If using
gcc, this is gcc, and if not, usually equal to cc, unimpressive, no?
Some platforms, however, make good use of this by storing the
flavor of the C compiler being used here. For example if using
the Sun WorkShop suite, ccname will be workshop
.
From Cppsym.U:
The variable contains the symbols defined by the C compiler alone. The symbols defined by cpp or by cc when it calls cpp are not in this list, see cppsymbols and cppccsymbols. The list is a space-separated list of symbol=value tokens.
From Checkcc.U:
This can set either by hints files or by Configure. If using a (non-gcc) vendor cc, this variable may contain a version for the compiler.
From cf_who.U:
Login name of the person who ran the Configure script and answered the questions. This is used to tag both config.sh and config_h.SH.
From cf_email.U:
Electronic mail address of the person who ran Configure. This can be used by units that require the user's e-mail, like MailList.U.
From cf_who.U:
Holds the output of the date
command when the configuration file was
produced. This is used to tag both config.sh and config_h.SH.
From charsize.U:
This variable contains the value of the CHARSIZE
symbol, which
indicates to the C program how many bytes there are in a character.
From Loc.U:
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
From Loc.U:
This variable is used internally by Configure to determine the
full pathname (if any) of the chmod program. After Configure runs,
the value is reset to a plain chmod and is not useful.
From Loc.U:
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
From d_times.U:
This variable holds the type returned by times(). It can be long,
or clock_t on BSD
sites (in which case <sys/types.h> should be
included).
From Loc.U:
This variable is used internally by Configure to determine the
full pathname (if any) of the comm program. After Configure runs,
the value is reset to a plain comm
and is not useful.
From Loc.U:
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
From contains.U:
This variable holds the command to do a grep with a proper return
status. On most sane systems it is simply grep. On insane systems
it is a grep followed by a cat followed by a test. This variable
is primarily for the use of other Configure units.
From Loc.U:
This variable is used internally by Configure to determine the
full pathname (if any) of the cp program. After Configure runs,
the value is reset to a plain cp
and is not useful.
From Loc.U:
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
From Loc.U:
This variable is used internally by Configure to determine the
full pathname (if any) of the cpp program. After Configure runs,
the value is reset to a plain cpp
and is not useful.
From cpp_stuff.U:
This variable contains an identification of the concatenation mechanism used by the C preprocessor.
From Cppsym.U:
The variable contains the symbols defined by the C compiler when it calls cpp. The symbols defined by the cc alone or cpp alone are not in this list, see ccsymbols and cppsymbols. The list is a space-separated list of symbol=value tokens.
From ccflags.U:
This variable holds the flags that will be passed to the C pre- processor. It is up to the Makefile to use it.
From cppstdin.U:
This variable has the same functionality as cppminus, only it applies to cpprun and not cppstdin.
From cppstdin.U:
This variable contains the second part of the string which will invoke
the C preprocessor on the standard input and produce to standard
output. This variable will have the value -
if cppstdin needs
a minus to specify standard input, otherwise the value is "".
From cppstdin.U:
This variable contains the command which will invoke a C preprocessor on standard input and put the output to stdout. It is guaranteed not to be a wrapper and may be a null string if no preprocessor can be made directly available. This preprocessor might be different from the one used by the C compiler. Don't forget to append cpplast after the preprocessor options.
From cppstdin.U:
This variable contains the command which will invoke the C preprocessor on standard input and put the output to stdout. It is primarily used by other Configure units that ask about preprocessor symbols.
From Cppsym.U:
The variable contains the symbols defined by the C preprocessor alone. The symbols defined by cc or by cc when it calls cpp are not in this list, see ccsymbols and cppccsymbols. The list is a space-separated list of symbol=value tokens.
From d_crypt_r.U:
This variable encodes the prototype of crypt_r.
It is zero if d_crypt_r is undef, and one of the
REENTRANT_PROTO_T_ABC
macros of reentr.h if d_crypt_r
is defined.
From d_crypt.U:
This variable holds -lcrypt or the path to a libcrypt.a archive if the crypt() function is not defined in the standard C library. It is up to the Makefile to use this.
From Loc.U:
This variable is used internally by Configure to determine the
full pathname (if any) of the csh program. After Configure runs,
the value is reset to a plain csh
and is not useful.
From d_ctermid_r.U:
This variable encodes the prototype of ctermid_r.
It is zero if d_ctermid_r is undef, and one of the
REENTRANT_PROTO_T_ABC
macros of reentr.h if d_ctermid_r
is defined.
From d_ctime_r.U:
This variable encodes the prototype of ctime_r.
It is zero if d_ctime_r is undef, and one of the
REENTRANT_PROTO_T_ABC
macros of reentr.h if d_ctime_r
is defined.
d
d__fwalkd_accessd_accessxd_aintld_alarmd_archlibd_asctime_rd_atolfd_atolld_attributd_bcmpd_bcopyd_bsdd_bsdgetpgrpd_bsdsetpgrpd_bzerod_casti32d_castnegd_charvsprd_chownd_chrootd_chsized_classd_closedird_cmsghdr_sd_constd_copysignld_cryptd_crypt_rd_cshd_ctermid_rd_ctime_rd_cuseridd_dbl_digd_dbminitprotod_difftimed_dirfdd_dirnamlend_dlerrord_dlopend_dlsymund_dosuidd_drand48_rd_drand48protod_dup2d_eaccessd_endgrentd_endgrent_rd_endhentd_endhostent_rd_endnentd_endnetent_rd_endpentd_endprotoent_rd_endpwentd_endpwent_rd_endsentd_endservent_rd_eofnblkd_euniced_faststdiod_fchdird_fchmodd_fchownd_fcntld_fcntl_can_lockd_fd_macrosd_fd_setd_fds_bitsd_fgetposd_finited_finiteld_flexfnamd_flockd_flockprotod_forkd_fp_classd_fpathconfd_fpclassd_fpclassifyd_fpclassld_fpos64_td_frexpld_fs_data_sd_fseekod_fsetposd_fstatfsd_fstatvfsd_fsyncd_ftellod_ftimed_Gconvertd_getcwdd_getespwnamd_getfsstatd_getgrentd_getgrent_rd_getgrgid_rd_getgrnam_rd_getgrpsd_gethbyaddrd_gethbynamed_gethentd_gethnamed_gethostbyaddr_rd_gethostbyname_rd_gethostent_rd_gethostprotosd_getitimerd_getlogind_getlogin_rd_getmntd_getmntentd_getnbyaddrd_getnbynamed_getnentd_getnetbyaddr_rd_getnetbyname_rd_getnetent_rd_getnetprotosd_getpagszd_getpbynamed_getpbynumberd_getpentd_getpgidd_getpgrp2d_getpgrpd_getppidd_getpriord_getprotobyname_rd_getprotobynumber_rd_getprotoent_rd_getprotoprotosd_getprpwnamd_getpwentd_getpwent_rd_getpwnam_rd_getpwuid_rd_getsbynamed_getsbyportd_getsentd_getservbyname_rd_getservbyport_rd_getservent_rd_getservprotosd_getspnamd_getspnam_rd_gettimeodd_gmtime_rd_gnulibcd_grpasswdd_hasmntoptd_htonld_ilogbld_indexd_inetatond_int64_td_isasciid_isfinited_isinfd_isnand_isnanld_killpgd_lchownd_ldbl_digd_linkd_localtime_rd_locconvd_lockfd_longdbld_longlongd_lseekprotod_lstatd_madvised_mblend_mbstowcsd_mbtowcd_memchrd_memcmpd_memcpyd_memmoved_memsetd_mkdird_mkdtempd_mkfifod_mkstempd_mkstempsd_mktimed_mmapd_modfld_modfl_pow32_bugd_modflprotod_mprotectd_msgd_msg_ctruncd_msg_dontrouted_msg_oobd_msg_peekd_msg_proxyd_msgctld_msggetd_msghdr_sd_msgrcvd_msgsndd_msyncd_munmapd_mymallocd_nanosleepd_niced_nl_langinfod_nv_preserves_uvd_off64_td_old_pthread_create_joinabled_oldpthreadsd_oldsockd_open3d_pathconfd_paused_perl_otherlibdirsd_phostnamed_piped_polld_portabled_PRId64d_PRIeldbld_PRIEUldbld_PRIfldbld_PRIFUldbld_PRIgldbld_PRIGUldbld_PRIi64d_PRIo64d_PRIu64d_PRIx64d_PRIXU64d_procselfexed_pthread_atforkd_pthread_attr_setscoped_pthread_yieldd_pwaged_pwchanged_pwclassd_pwcommentd_pwexpired_pwgecosd_pwpasswdd_pwquotad_qgcvtd_quadd_random_rd_readdir64_rd_readdird_readdir_rd_readlinkd_readvd_recvmsgd_renamed_rewinddird_rmdird_safebcpyd_safemcpyd_sanemcmpd_sbrkprotod_scalbnld_sched_yieldd_scm_rightsd_SCNfldbld_seekdird_selectd_semd_semctld_semctl_semid_dsd_semctl_semund_semgetd_semopd_sendmsgd_setegidd_seteuidd_setgrentd_setgrent_rd_setgrpsd_sethentd_sethostent_rd_setitimerd_setlinebufd_setlocaled_setlocale_rd_setnentd_setnetent_rd_setpentd_setpgidd_setpgrp2d_setpgrpd_setpriord_setproctitled_setprotoent_rd_setpwentd_setpwent_rd_setregidd_setresgidd_setresuidd_setreuidd_setrgidd_setruidd_setsentd_setservent_rd_setsidd_setvbufd_sfiod_shmd_shmatd_shmatprototyped_shmctld_shmdt
From d__fwalk.U:
This variable conditionally defines HAS__FWALK
if _fwalk() is
available to apply a function to all the file handles.
From d_access.U:
This variable conditionally defines HAS_ACCESS
if the access() system
call is available to check for access permissions using real IDs.
From d_accessx.U:
This variable conditionally defines the HAS_ACCESSX
symbol, which
indicates to the C program that the accessx() routine is available.
From d_aintl.U:
This variable conditionally defines the HAS_AINTL
symbol, which
indicates to the C program that the aintl() routine is available.
If copysignl is also present we can emulate modfl.
From d_alarm.U:
This variable conditionally defines the HAS_ALARM
symbol, which
indicates to the C program that the alarm() routine is available.
From archlib.U:
This variable conditionally defines ARCHLIB
to hold the pathname
of architecture-dependent library files for $package. If
$archlib is the same as $privlib, then this is set to undef.
From d_asctime_r.U:
This variable conditionally defines the HAS_ASCTIME_R
symbol,
which indicates to the C program that the asctime_r()
routine is available.
From atolf.U:
This variable conditionally defines the HAS_ATOLF
symbol, which
indicates to the C program that the atolf() routine is available.
From atoll.U:
This variable conditionally defines the HAS_ATOLL
symbol, which
indicates to the C program that the atoll() routine is available.
From d_attribut.U:
This variable conditionally defines HASATTRIBUTE
, which
indicates the C compiler can check for function attributes,
such as printf formats.
From d_bcmp.U:
This variable conditionally defines the HAS_BCMP
symbol if
the bcmp() routine is available to compare strings.
From d_bcopy.U:
This variable conditionally defines the HAS_BCOPY
symbol if
the bcopy() routine is available to copy strings.
From Guess.U:
This symbol conditionally defines the symbol BSD
when running on a
BSD
system.
From d_getpgrp.U:
This variable conditionally defines USE_BSD_GETPGRP
if
getpgrp needs one arguments whereas USG
one needs none.
From d_setpgrp.U:
This variable conditionally defines USE_BSD_SETPGRP
if
setpgrp needs two arguments whereas USG
one needs none.
See also d_setpgid for a POSIX interface.
From d_bzero.U:
This variable conditionally defines the HAS_BZERO
symbol if
the bzero() routine is available to set memory to 0.
From d_casti32.U:
This variable conditionally defines CASTI32, which indicates whether the C compiler can cast large floats to 32-bit ints.
From d_castneg.U:
This variable conditionally defines CASTNEG
, which indicates
wether the C compiler can cast negative float to unsigned.
From d_vprintf.U:
This variable conditionally defines CHARVSPRINTF
if this system
has vsprintf returning type (char*). The trend seems to be to
declare it as "int vsprintf()".
From d_chown.U:
This variable conditionally defines the HAS_CHOWN
symbol, which
indicates to the C program that the chown() routine is available.
From d_chroot.U:
This variable conditionally defines the HAS_CHROOT
symbol, which
indicates to the C program that the chroot() routine is available.
From d_chsize.U:
This variable conditionally defines the CHSIZE
symbol, which
indicates to the C program that the chsize() routine is available
to truncate files. You might need a -lx to get this routine.
From d_class.U:
This variable conditionally defines the HAS_CLASS
symbol, which
indicates to the C program that the class() routine is available.
From d_closedir.U:
This variable conditionally defines HAS_CLOSEDIR
if closedir() is
available.
From d_cmsghdr_s.U:
This variable conditionally defines the HAS_STRUCT_CMSGHDR
symbol,
which indicates that the struct cmsghdr is supported.
From d_const.U:
This variable conditionally defines the HASCONST
symbol, which
indicates to the C program that this C compiler knows about the
const type.
From d_copysignl.U:
This variable conditionally defines the HAS_COPYSIGNL
symbol, which
indicates to the C program that the copysignl() routine is available.
If aintl is also present we can emulate modfl.
From d_crypt.U:
This variable conditionally defines the CRYPT
symbol, which
indicates to the C program that the crypt() routine is available
to encrypt passwords and the like.
From d_crypt_r.U:
This variable conditionally defines the HAS_CRYPT_R
symbol,
which indicates to the C program that the crypt_r()
routine is available.
From d_csh.U:
This variable conditionally defines the CSH
symbol, which
indicates to the C program that the C-shell exists.
From d_ctermid_r.U:
This variable conditionally defines the HAS_CTERMID_R
symbol,
which indicates to the C program that the ctermid_r()
routine is available.
From d_ctime_r.U:
This variable conditionally defines the HAS_CTIME_R
symbol,
which indicates to the C program that the ctime_r()
routine is available.
From d_cuserid.U:
This variable conditionally defines the HAS_CUSERID
symbol, which
indicates to the C program that the cuserid() routine is available
to get character login names.
From d_dbl_dig.U:
This variable conditionally defines d_dbl_dig if this system's
header files provide DBL_DIG
, which is the number of significant
digits in a double precision number.
From d_dbminitproto.U:
This variable conditionally defines the HAS_DBMINIT_PROTO
symbol,
which indicates to the C program that the system provides
a prototype for the dbminit() function. Otherwise, it is
up to the program to supply one.
From d_difftime.U:
This variable conditionally defines the HAS_DIFFTIME
symbol, which
indicates to the C program that the difftime() routine is available.
From d_dirfd.U:
This variable conditionally defines the HAS_DIRFD
constant,
which indicates to the C program that dirfd() is available
to return the file descriptor of a directory stream.
From i_dirent.U:
This variable conditionally defines DIRNAMLEN
, which indicates
to the C program that the length of directory entry names is
provided by a d_namelen field.
From d_dlerror.U:
This variable conditionally defines the HAS_DLERROR
symbol, which
indicates to the C program that the dlerror() routine is available.
From d_dlopen.U:
This variable conditionally defines the HAS_DLOPEN
symbol, which
indicates to the C program that the dlopen() routine is available.
From d_dlsymun.U:
This variable conditionally defines DLSYM_NEEDS_UNDERSCORE
, which
indicates that we need to prepend an underscore to the symbol
name before calling dlsym().
From d_dosuid.U:
This variable conditionally defines the symbol DOSUID
, which
tells the C program that it should insert setuid emulation code
on hosts which have setuid #! scripts disabled.
From d_drand48_r.U:
This variable conditionally defines the HAS_DRAND48_R symbol, which indicates to the C program that the drand48_r() routine is available.
From d_drand48proto.U:
This variable conditionally defines the HAS_DRAND48_PROTO symbol, which indicates to the C program that the system provides a prototype for the drand48() function. Otherwise, it is up to the program to supply one.
From d_dup2.U:
This variable conditionally defines HAS_DUP2 if dup2() is available to duplicate file descriptors.
From d_eaccess.U:
This variable conditionally defines the HAS_EACCESS
symbol, which
indicates to the C program that the eaccess() routine is available.
From d_endgrent.U:
This variable conditionally defines the HAS_ENDGRENT
symbol, which
indicates to the C program that the endgrent() routine is available
for sequential access of the group database.
From d_endgrent_r.U:
This variable conditionally defines the HAS_ENDGRENT_R
symbol,
which indicates to the C program that the endgrent_r()
routine is available.
From d_endhent.U:
This variable conditionally defines HAS_ENDHOSTENT
if endhostent() is
available to close whatever was being used for host queries.
From d_endhostent_r.U:
This variable conditionally defines the HAS_ENDHOSTENT_R
symbol,
which indicates to the C program that the endhostent_r()
routine is available.
From d_endnent.U:
This variable conditionally defines HAS_ENDNETENT
if endnetent() is
available to close whatever was being used for network queries.
From d_endnetent_r.U:
This variable conditionally defines the HAS_ENDNETENT_R
symbol,
which indicates to the C program that the endnetent_r()
routine is available.
From d_endpent.U:
This variable conditionally defines HAS_ENDPROTOENT
if endprotoent() is
available to close whatever was being used for protocol queries.
From d_endprotoent_r.U:
This variable conditionally defines the HAS_ENDPROTOENT_R
symbol,
which indicates to the C program that the endprotoent_r()
routine is available.
From d_endpwent.U:
This variable conditionally defines the HAS_ENDPWENT
symbol, which
indicates to the C program that the endpwent() routine is available
for sequential access of the passwd database.
From d_endpwent_r.U:
This variable conditionally defines the HAS_ENDPWENT_R
symbol,
which indicates to the C program that the endpwent_r()
routine is available.
From d_endsent.U:
This variable conditionally defines HAS_ENDSERVENT
if endservent() is
available to close whatever was being used for service queries.
From d_endservent_r.U:
This variable conditionally defines the HAS_ENDSERVENT_R
symbol,
which indicates to the C program that the endservent_r()
routine is available.
From nblock_io.U:
This variable conditionally defines EOF_NONBLOCK
if EOF
can be seen
when reading from a non-blocking I/O source.
From Guess.U:
This variable conditionally defines the symbols EUNICE
and VAX
, which
alerts the C program that it must deal with ideosyncracies of VMS
.
From d_faststdio.U:
This variable conditionally defines the HAS_FAST_STDIO
symbol,
which indicates to the C program that the "fast stdio" is available
to manipulate the stdio buffers directly.
From d_fchdir.U:
This variable conditionally defines the HAS_FCHDIR
symbol, which
indicates to the C program that the fchdir() routine is available.
From d_fchmod.U:
This variable conditionally defines the HAS_FCHMOD
symbol, which
indicates to the C program that the fchmod() routine is available
to change mode of opened files.
From d_fchown.U:
This variable conditionally defines the HAS_FCHOWN
symbol, which
indicates to the C program that the fchown() routine is available
to change ownership of opened files.
From d_fcntl.U:
This variable conditionally defines the HAS_FCNTL
symbol, and indicates
whether the fcntl() function exists
From d_fcntl_can_lock.U:
This variable conditionally defines the FCNTL_CAN_LOCK
symbol
and indicates whether file locking with fcntl() works.
From d_fd_set.U:
This variable contains the eventual value of the HAS_FD_MACROS
symbol,
which indicates if your C compiler knows about the macros which
manipulate an fd_set.
From d_fd_set.U:
This variable contains the eventual value of the HAS_FD_SET
symbol,
which indicates if your C compiler knows about the fd_set typedef.
From d_fd_set.U:
This variable contains the eventual value of the HAS_FDS_BITS
symbol,
which indicates if your fd_set typedef contains the fds_bits member.
If you have an fd_set typedef, but the dweebs who installed it did
a half-fast job and neglected to provide the macros to manipulate
an fd_set, HAS_FDS_BITS
will let us know how to fix the gaffe.
From d_fgetpos.U:
This variable conditionally defines HAS_FGETPOS
if fgetpos() is
available to get the file position indicator.
From d_finite.U:
This variable conditionally defines the HAS_FINITE
symbol, which
indicates to the C program that the finite() routine is available.
From d_finitel.U:
This variable conditionally defines the HAS_FINITEL
symbol, which
indicates to the C program that the finitel() routine is available.
From d_flexfnam.U:
This variable conditionally defines the FLEXFILENAMES
symbol, which
indicates that the system supports filenames longer than 14 characters.
From d_flock.U:
This variable conditionally defines HAS_FLOCK
if flock() is
available to do file locking.
From d_flockproto.U:
This variable conditionally defines the HAS_FLOCK_PROTO
symbol,
which indicates to the C program that the system provides
a prototype for the flock() function. Otherwise, it is
up to the program to supply one.
From d_fork.U:
This variable conditionally defines the HAS_FORK
symbol, which
indicates to the C program that the fork() routine is available.
From d_fp_class.U:
This variable conditionally defines the HAS_FP_CLASS
symbol, which
indicates to the C program that the fp_class() routine is available.
From d_pathconf.U:
This variable conditionally defines the HAS_FPATHCONF
symbol, which
indicates to the C program that the pathconf() routine is available
to determine file-system related limits and options associated
with a given open file descriptor.
From d_fpclass.U:
This variable conditionally defines the HAS_FPCLASS
symbol, which
indicates to the C program that the fpclass() routine is available.
From d_fpclassify.U:
This variable conditionally defines the HAS_FPCLASSIFY
symbol, which
indicates to the C program that the fpclassify() routine is available.
From d_fpclassl.U:
This variable conditionally defines the HAS_FPCLASSL
symbol, which
indicates to the C program that the fpclassl() routine is available.
From d_fpos64_t.U:
This symbol will be defined if the C compiler supports fpos64_t.
From d_frexpl.U:
This variable conditionally defines the HAS_FREXPL
symbol, which
indicates to the C program that the frexpl() routine is available.
From d_fs_data_s.U:
This variable conditionally defines the HAS_STRUCT_FS_DATA
symbol,
which indicates that the struct fs_data is supported.
From d_fseeko.U:
This variable conditionally defines the HAS_FSEEKO
symbol, which
indicates to the C program that the fseeko() routine is available.
From d_fsetpos.U:
This variable conditionally defines HAS_FSETPOS
if fsetpos() is
available to set the file position indicator.
From d_fstatfs.U:
This variable conditionally defines the HAS_FSTATFS
symbol, which
indicates to the C program that the fstatfs() routine is available.
From d_statvfs.U:
This variable conditionally defines the HAS_FSTATVFS
symbol, which
indicates to the C program that the fstatvfs() routine is available.
From d_fsync.U:
This variable conditionally defines the HAS_FSYNC
symbol, which
indicates to the C program that the fsync() routine is available.
From d_ftello.U:
This variable conditionally defines the HAS_FTELLO
symbol, which
indicates to the C program that the ftello() routine is available.
From d_ftime.U:
This variable conditionally defines the HAS_FTIME
symbol, which indicates
that the ftime() routine exists. The ftime() routine is basically
a sub-second accuracy clock.
From d_gconvert.U:
This variable holds what Gconvert is defined as to convert
floating point numbers into strings. By default, Configure
sets this
macro to use the first of gconvert, gcvt, or sprintf
that pass sprintf-%g-like behaviour tests. If perl is using
long doubles, the macro uses the first of the following
functions that pass Configure's tests: qgcvt, sprintf (if
Configure knows how to make sprintf format long doubles--see
sPRIgldbl), gconvert, gcvt, and sprintf (casting to double).
The gconvert_preference and gconvert_ld_preference variables
can be used to alter Configure's preferences, for doubles and
long doubles, respectively. If present, they contain a
space-separated list of one or more of the above function
names in the order they should be tried.
d_Gconvert may be set to override Configure with a platform- specific function. If this function expects a double, a different value may need to be set by the uselongdouble.cbu call-back unit so that long doubles can be formatted without loss of precision.
From d_getcwd.U:
This variable conditionally defines the HAS_GETCWD
symbol, which
indicates to the C program that the getcwd() routine is available
to get the current working directory.
From d_getespwnam.U:
This variable conditionally defines HAS_GETESPWNAM
if getespwnam() is
available to retrieve enchanced (shadow) password entries by name.
From d_getfsstat.U:
This variable conditionally defines the HAS_GETFSSTAT
symbol, which
indicates to the C program that the getfsstat() routine is available.
From d_getgrent.U:
This variable conditionally defines the HAS_GETGRENT
symbol, which
indicates to the C program that the getgrent() routine is available
for sequential access of the group database.
From d_getgrent_r.U:
This variable conditionally defines the HAS_GETGRENT_R
symbol,
which indicates to the C program that the getgrent_r()
routine is available.
From d_getgrgid_r.U:
This variable conditionally defines the HAS_GETGRGID_R
symbol,
which indicates to the C program that the getgrgid_r()
routine is available.
From d_getgrnam_r.U:
This variable conditionally defines the HAS_GETGRNAM_R
symbol,
which indicates to the C program that the getgrnam_r()
routine is available.
From d_getgrps.U:
This variable conditionally defines the HAS_GETGROUPS
symbol, which
indicates to the C program that the getgroups() routine is available
to get the list of process groups.
From d_gethbyad.U:
This variable conditionally defines the HAS_GETHOSTBYADDR
symbol, which
indicates to the C program that the gethostbyaddr() routine is available
to look up hosts by their IP
addresses.
From d_gethbynm.U:
This variable conditionally defines the HAS_GETHOSTBYNAME
symbol, which
indicates to the C program that the gethostbyname() routine is available
to look up host names in some data base or other.
From d_gethent.U:
This variable conditionally defines HAS_GETHOSTENT
if gethostent() is
available to look up host names in some data base or another.
From d_gethname.U:
This variable conditionally defines the HAS_GETHOSTNAME
symbol, which
indicates to the C program that the gethostname() routine may be
used to derive the host name.
From d_gethostbyaddr_r.U:
This variable conditionally defines the HAS_GETHOSTBYADDR_R
symbol,
which indicates to the C program that the gethostbyaddr_r()
routine is available.
From d_gethostbyname_r.U:
This variable conditionally defines the HAS_GETHOSTBYNAME_R
symbol,
which indicates to the C program that the gethostbyname_r()
routine is available.
From d_gethostent_r.U:
This variable conditionally defines the HAS_GETHOSTENT_R
symbol,
which indicates to the C program that the gethostent_r()
routine is available.
From d_gethostprotos.U:
This variable conditionally defines the HAS_GETHOST_PROTOS
symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various gethost*() functions.
See also netdbtype.U for probing for various netdb types.
From d_getitimer.U:
This variable conditionally defines the HAS_GETITIMER
symbol, which
indicates to the C program that the getitimer() routine is available.
From d_getlogin.U:
This variable conditionally defines the HAS_GETLOGIN
symbol, which
indicates to the C program that the getlogin() routine is available
to get the login name.
From d_getlogin_r.U:
This variable conditionally defines the HAS_GETLOGIN_R
symbol,
which indicates to the C program that the getlogin_r()
routine is available.
From d_getmnt.U:
This variable conditionally defines the HAS_GETMNT
symbol, which
indicates to the C program that the getmnt() routine is available
to retrieve one or more mount info blocks by filename.
From d_getmntent.U:
This variable conditionally defines the HAS_GETMNTENT
symbol, which
indicates to the C program that the getmntent() routine is available
to iterate through mounted files to get their mount info.
From d_getnbyad.U:
This variable conditionally defines the HAS_GETNETBYADDR
symbol, which
indicates to the C program that the getnetbyaddr() routine is available
to look up networks by their IP
addresses.
From d_getnbynm.U:
This variable conditionally defines the HAS_GETNETBYNAME
symbol, which
indicates to the C program that the getnetbyname() routine is available
to look up networks by their names.
From d_getnent.U:
This variable conditionally defines HAS_GETNETENT
if getnetent() is
available to look up network names in some data base or another.
From d_getnetbyaddr_r.U:
This variable conditionally defines the HAS_GETNETBYADDR_R
symbol,
which indicates to the C program that the getnetbyaddr_r()
routine is available.
From d_getnetbyname_r.U:
This variable conditionally defines the HAS_GETNETBYNAME_R
symbol,
which indicates to the C program that the getnetbyname_r()
routine is available.
From d_getnetent_r.U:
This variable conditionally defines the HAS_GETNETENT_R
symbol,
which indicates to the C program that the getnetent_r()
routine is available.
From d_getnetprotos.U:
This variable conditionally defines the HAS_GETNET_PROTOS
symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various getnet*() functions.
See also netdbtype.U for probing for various netdb types.
From d_getpagsz.U:
This variable conditionally defines HAS_GETPAGESIZE
if getpagesize()
is available to get the system page size.
From d_getprotby.U:
This variable conditionally defines the HAS_GETPROTOBYNAME
symbol, which indicates to the C program that the
getprotobyname() routine is available to look up protocols
by their name.
From d_getprotby.U:
This variable conditionally defines the HAS_GETPROTOBYNUMBER
symbol, which indicates to the C program that the
getprotobynumber() routine is available to look up protocols
by their number.
From d_getpent.U:
This variable conditionally defines HAS_GETPROTOENT
if getprotoent() is
available to look up protocols in some data base or another.
From d_getpgid.U:
This variable conditionally defines the HAS_GETPGID
symbol, which
indicates to the C program that the getpgid(pid) function
is available to get the process group id.
From d_getpgrp2.U:
This variable conditionally defines the HAS_GETPGRP2 symbol, which
indicates to the C program that the getpgrp2() (as in DG/UX
) routine
is available to get the current process group.
From d_getpgrp.U:
This variable conditionally defines HAS_GETPGRP
if getpgrp() is
available to get the current process group.
From d_getppid.U:
This variable conditionally defines the HAS_GETPPID
symbol, which
indicates to the C program that the getppid() routine is available
to get the parent process ID
.
From d_getprior.U:
This variable conditionally defines HAS_GETPRIORITY
if getpriority()
is available to get a process's priority.
From d_getprotobyname_r.U:
This variable conditionally defines the HAS_GETPROTOBYNAME_R
symbol,
which indicates to the C program that the getprotobyname_r()
routine is available.
From d_getprotobynumber_r.U:
This variable conditionally defines the HAS_GETPROTOBYNUMBER_R
symbol,
which indicates to the C program that the getprotobynumber_r()
routine is available.
From d_getprotoent_r.U:
This variable conditionally defines the HAS_GETPROTOENT_R
symbol,
which indicates to the C program that the getprotoent_r()
routine is available.
From d_getprotoprotos.U:
This variable conditionally defines the HAS_GETPROTO_PROTOS
symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various getproto*() functions.
See also netdbtype.U for probing for various netdb types.
From d_getprpwnam.U:
This variable conditionally defines HAS_GETPRPWNAM
if getprpwnam() is
available to retrieve protected (shadow) password entries by name.
From d_getpwent.U:
This variable conditionally defines the HAS_GETPWENT
symbol, which
indicates to the C program that the getpwent() routine is available
for sequential access of the passwd database.
From d_getpwent_r.U:
This variable conditionally defines the HAS_GETPWENT_R
symbol,
which indicates to the C program that the getpwent_r()
routine is available.
From d_getpwnam_r.U:
This variable conditionally defines the HAS_GETPWNAM_R
symbol,
which indicates to the C program that the getpwnam_r()
routine is available.
From d_getpwuid_r.U:
This variable conditionally defines the HAS_GETPWUID_R
symbol,
which indicates to the C program that the getpwuid_r()
routine is available.
From d_getsrvby.U:
This variable conditionally defines the HAS_GETSERVBYNAME
symbol, which indicates to the C program that the
getservbyname() routine is available to look up services
by their name.
From d_getsrvby.U:
This variable conditionally defines the HAS_GETSERVBYPORT
symbol, which indicates to the C program that the
getservbyport() routine is available to look up services
by their port.
From d_getsent.U:
This variable conditionally defines HAS_GETSERVENT
if getservent() is
available to look up network services in some data base or another.
From d_getservbyname_r.U:
This variable conditionally defines the HAS_GETSERVBYNAME_R
symbol,
which indicates to the C program that the getservbyname_r()
routine is available.
From d_getservbyport_r.U:
This variable conditionally defines the HAS_GETSERVBYPORT_R
symbol,
which indicates to the C program that the getservbyport_r()
routine is available.
From d_getservent_r.U:
This variable conditionally defines the HAS_GETSERVENT_R
symbol,
which indicates to the C program that the getservent_r()
routine is available.
From d_getservprotos.U:
This variable conditionally defines the HAS_GETSERV_PROTOS
symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various getserv*() functions.
See also netdbtype.U for probing for various netdb types.
From d_getspnam.U:
This variable conditionally defines HAS_GETSPNAM
if getspnam() is
available to retrieve SysV shadow password entries by name.
From d_getspnam_r.U:
This variable conditionally defines the HAS_GETSPNAM_R
symbol,
which indicates to the C program that the getspnam_r()
routine is available.
From d_ftime.U:
This variable conditionally defines the HAS_GETTIMEOFDAY
symbol, which
indicates that the gettimeofday() system call exists (to obtain a
sub-second accuracy clock). You should probably include <sys/resource.h>.
From d_gmtime_r.U:
This variable conditionally defines the HAS_GMTIME_R
symbol,
which indicates to the C program that the gmtime_r()
routine is available.
From d_gnulibc.U:
Defined if we're dealing with the GNU
C Library.
From i_grp.U:
This variable conditionally defines GRPASSWD
, which indicates
that struct group in <grp.h> contains gr_passwd.
From d_hasmntopt.U:
This variable conditionally defines the HAS_HASMNTOPT
symbol, which
indicates to the C program that the hasmntopt() routine is available
to query the mount options of file systems.
From d_htonl.U:
This variable conditionally defines HAS_HTONL
if htonl() and its
friends are available to do network order byte swapping.
From d_ilogbl.U:
This variable conditionally defines the HAS_ILOGBL
symbol, which
indicates to the C program that the ilogbl() routine is available.
If scalbnl is also present we can emulate frexpl.
From d_strchr.U:
This variable conditionally defines HAS_INDEX
if index() and
rindex() are available for string searching.
From d_inetaton.U:
This variable conditionally defines the HAS_INET_ATON
symbol, which
indicates to the C program that the inet_aton() function is available
to parse IP
address dotted-quad
strings.
From d_int64_t.U:
This symbol will be defined if the C compiler supports int64_t.
From d_isascii.U:
This variable conditionally defines the HAS_ISASCII
constant,
which indicates to the C program that isascii() is available.
From d_isfinite.U:
This variable conditionally defines the HAS_ISFINITE
symbol, which
indicates to the C program that the isfinite() routine is available.
From d_isinf.U:
This variable conditionally defines the HAS_ISINF
symbol, which
indicates to the C program that the isinf() routine is available.
From d_isnan.U:
This variable conditionally defines the HAS_ISNAN
symbol, which
indicates to the C program that the isnan() routine is available.
From d_isnanl.U:
This variable conditionally defines the HAS_ISNANL
symbol, which
indicates to the C program that the isnanl() routine is available.
From d_killpg.U:
This variable conditionally defines the HAS_KILLPG
symbol, which
indicates to the C program that the killpg() routine is available
to kill process groups.
From d_lchown.U:
This variable conditionally defines the HAS_LCHOWN
symbol, which
indicates to the C program that the lchown() routine is available
to operate on a symbolic link (instead of following the link).
From d_ldbl_dig.U:
This variable conditionally defines d_ldbl_dig if this system's
header files provide LDBL_DIG
, which is the number of significant
digits in a long double precision number.
From d_link.U:
This variable conditionally defines HAS_LINK
if link() is
available to create hard links.
From d_localtime_r.U:
This variable conditionally defines the HAS_LOCALTIME_R
symbol,
which indicates to the C program that the localtime_r()
routine is available.
From d_locconv.U:
This variable conditionally defines HAS_LOCALECONV
if localeconv() is
available for numeric and monetary formatting conventions.
From d_lockf.U:
This variable conditionally defines HAS_LOCKF
if lockf() is
available to do file locking.
From d_longdbl.U:
This variable conditionally defines HAS_LONG_DOUBLE
if
the long double type is supported.
From d_longlong.U:
This variable conditionally defines HAS_LONG_LONG
if
the long long type is supported.
From d_lseekproto.U:
This variable conditionally defines the HAS_LSEEK_PROTO
symbol,
which indicates to the C program that the system provides
a prototype for the lseek() function. Otherwise, it is
up to the program to supply one.
From d_lstat.U:
This variable conditionally defines HAS_LSTAT
if lstat() is
available to do file stats on symbolic links.
From d_madvise.U:
This variable conditionally defines HAS_MADVISE
if madvise() is
available to map a file into memory.
From d_mblen.U:
This variable conditionally defines the HAS_MBLEN
symbol, which
indicates to the C program that the mblen() routine is available
to find the number of bytes in a multibye character.
From d_mbstowcs.U:
This variable conditionally defines the HAS_MBSTOWCS
symbol, which
indicates to the C program that the mbstowcs() routine is available
to convert a multibyte string into a wide character string.
From d_mbtowc.U:
This variable conditionally defines the HAS_MBTOWC
symbol, which
indicates to the C program that the mbtowc() routine is available
to convert multibyte to a wide character.
From d_memchr.U:
This variable conditionally defines the HAS_MEMCHR
symbol, which
indicates to the C program that the memchr() routine is available
to locate characters within a C string.
From d_memcmp.U:
This variable conditionally defines the HAS_MEMCMP
symbol, which
indicates to the C program that the memcmp() routine is available
to compare blocks of memory.
From d_memcpy.U:
This variable conditionally defines the HAS_MEMCPY
symbol, which
indicates to the C program that the memcpy() routine is available
to copy blocks of memory.
From d_memmove.U:
This variable conditionally defines the HAS_MEMMOVE
symbol, which
indicates to the C program that the memmove() routine is available
to copy potentatially overlapping blocks of memory.
From d_memset.U:
This variable conditionally defines the HAS_MEMSET
symbol, which
indicates to the C program that the memset() routine is available
to set blocks of memory.
From d_mkdir.U:
This variable conditionally defines the HAS_MKDIR
symbol, which
indicates to the C program that the mkdir() routine is available
to create directories..
From d_mkdtemp.U:
This variable conditionally defines the HAS_MKDTEMP
symbol, which
indicates to the C program that the mkdtemp() routine is available
to exclusively create a uniquely named temporary directory.
From d_mkfifo.U:
This variable conditionally defines the HAS_MKFIFO
symbol, which
indicates to the C program that the mkfifo() routine is available.
From d_mkstemp.U:
This variable conditionally defines the HAS_MKSTEMP
symbol, which
indicates to the C program that the mkstemp() routine is available
to exclusively create and open a uniquely named temporary file.
From d_mkstemps.U:
This variable conditionally defines the HAS_MKSTEMPS
symbol, which
indicates to the C program that the mkstemps() routine is available
to exclusively create and open a uniquely named (with a suffix)
temporary file.
From d_mktime.U:
This variable conditionally defines the HAS_MKTIME
symbol, which
indicates to the C program that the mktime() routine is available.
From d_mmap.U:
This variable conditionally defines HAS_MMAP
if mmap() is
available to map a file into memory.
From d_modfl.U:
This variable conditionally defines the HAS_MODFL
symbol, which
indicates to the C program that the modfl() routine is available.
From d_modfl.U:
This variable conditionally defines the HAS_MODFL_POW32_BUG symbol, which indicates that modfl() is broken for long doubles >= pow(2, 32). For example from 4294967303.150000 one would get 4294967302.000000 and 1.150000. The bug has been seen in certain versions of glibc, release 2.2.2 is known to be okay.
From d_modfl.U:
This symbol, if defined, indicates that the system provides a prototype for the modfl() function. Otherwise, it is up to the program to supply one. C99 says it should be long double modfl(long double, long double *);
From d_mprotect.U:
This variable conditionally defines HAS_MPROTECT
if mprotect() is
available to modify the access protection of a memory mapped file.
From d_msg.U:
This variable conditionally defines the HAS_MSG
symbol, which
indicates that the entire msg*(2) library is present.
From d_socket.U:
This variable conditionally defines the HAS_MSG_CTRUNC
symbol,
which indicates that the MSG_CTRUNC
is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.
From d_socket.U:
This variable conditionally defines the HAS_MSG_DONTROUTE
symbol,
which indicates that the MSG_DONTROUTE
is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.
From d_socket.U:
This variable conditionally defines the HAS_MSG_OOB
symbol,
which indicates that the MSG_OOB
is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.
From d_socket.U:
This variable conditionally defines the HAS_MSG_PEEK
symbol,
which indicates that the MSG_PEEK
is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.
From d_socket.U:
This variable conditionally defines the HAS_MSG_PROXY
symbol,
which indicates that the MSG_PROXY
is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.
From d_msgctl.U:
This variable conditionally defines the HAS_MSGCTL
symbol, which
indicates to the C program that the msgctl() routine is available.
From d_msgget.U:
This variable conditionally defines the HAS_MSGGET
symbol, which
indicates to the C program that the msgget() routine is available.
From d_msghdr_s.U:
This variable conditionally defines the HAS_STRUCT_MSGHDR
symbol,
which indicates that the struct msghdr is supported.
From d_msgrcv.U:
This variable conditionally defines the HAS_MSGRCV
symbol, which
indicates to the C program that the msgrcv() routine is available.
From d_msgsnd.U:
This variable conditionally defines the HAS_MSGSND
symbol, which
indicates to the C program that the msgsnd() routine is available.
From d_msync.U:
This variable conditionally defines HAS_MSYNC
if msync() is
available to synchronize a mapped file.
From d_munmap.U:
This variable conditionally defines HAS_MUNMAP
if munmap() is
available to unmap a region mapped by mmap().
From mallocsrc.U:
This variable conditionally defines MYMALLOC
in case other parts
of the source want to take special action if MYMALLOC
is used.
This may include different sorts of profiling or error detection.
From d_nanosleep.U:
This variable conditionally defines HAS_NANOSLEEP
if nanosleep() is available to sleep with 1E-9 sec accuracy.
From d_nice.U:
This variable conditionally defines the HAS_NICE
symbol, which
indicates to the C program that the nice() routine is available.
From d_nl_langinfo.U:
This variable conditionally defines the HAS_NL_LANGINFO
symbol, which
indicates to the C program that the nl_langinfo() routine is available.
From perlxv.U:
This variable indicates whether a variable of type nvtype can preserve all the bits a variable of type uvtype.
From d_off64_t.U:
This symbol will be defined if the C compiler supports off64_t.
From d_pthrattrj.U:
This variable conditionally defines pthread_create_joinable.
undef if pthread.h defines PTHREAD_CREATE_JOINABLE
.
From usethreads.U:
This variable conditionally defines the OLD_PTHREADS_API
symbol,
and indicates that Perl should be built to use the old
draft POSIX threads API
. This is only potentially meaningful if
usethreads is set.
From d_socket.U:
This variable conditionally defines the OLDSOCKET
symbol, which
indicates that the BSD
socket interface is based on 4.1c and not 4.2.
From d_open3.U:
This variable conditionally defines the HAS_OPEN3 manifest constant, which indicates to the C program that the 3 argument version of the open(2) function is available.
From d_pathconf.U:
This variable conditionally defines the HAS_PATHCONF
symbol, which
indicates to the C program that the pathconf() routine is available
to determine file-system related limits and options associated
with a given filename.
From d_pause.U:
This variable conditionally defines the HAS_PAUSE
symbol, which
indicates to the C program that the pause() routine is available
to suspend a process until a signal is received.
From otherlibdirs.U:
This variable conditionally defines PERL_OTHERLIBDIRS
, which
contains a colon-separated set of paths for the perl binary to
include in @INC
. See also otherlibdirs.
From d_gethname.U:
This variable conditionally defines the HAS_PHOSTNAME
symbol, which
contains the shell command which, when fed to popen(), may be
used to derive the host name.
From d_pipe.U:
This variable conditionally defines the HAS_PIPE
symbol, which
indicates to the C program that the pipe() routine is available
to create an inter-process channel.
From d_poll.U:
This variable conditionally defines the HAS_POLL
symbol, which
indicates to the C program that the poll() routine is available
to poll active file descriptors.
From d_portable.U:
This variable conditionally defines the PORTABLE
symbol, which
indicates to the C program that it should not assume that it is
running on the machine it was compiled on.
From quadfio.U:
This variable conditionally defines the PERL_PRId64 symbol, which indiciates that stdio has a symbol to print 64-bit decimal numbers.
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to print long doubles.
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which
indiciates that stdio has a symbol to print long doubles.
The U
in the name is to separate this from d_PRIeldbl so that even
case-blind systems can see the difference.
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to print long doubles.
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which
indiciates that stdio has a symbol to print long doubles.
The U
in the name is to separate this from d_PRIfldbl so that even
case-blind systems can see the difference.
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to print long doubles.
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which
indiciates that stdio has a symbol to print long doubles.
The U
in the name is to separate this from d_PRIgldbl so that even
case-blind systems can see the difference.
From quadfio.U:
This variable conditionally defines the PERL_PRIi64 symbol, which indiciates that stdio has a symbol to print 64-bit decimal numbers.
From quadfio.U:
This variable conditionally defines the PERL_PRIo64 symbol, which indiciates that stdio has a symbol to print 64-bit octal numbers.
From quadfio.U:
This variable conditionally defines the PERL_PRIu64 symbol, which indiciates that stdio has a symbol to print 64-bit unsigned decimal numbers.
From quadfio.U:
This variable conditionally defines the PERL_PRIx64 symbol, which indiciates that stdio has a symbol to print 64-bit hexadecimal numbers.
From quadfio.U:
This variable conditionally defines the PERL_PRIXU64 symbol, which
indiciates that stdio has a symbol to print 64-bit hExADECimAl numbers.
The U
in the name is to separate this from d_PRIx64 so that even
case-blind systems can see the difference.
From d_procselfexe.U:
Defined if $procselfexe is symlink to the absolute pathname of the executing program.
From d_pthread_atfork.U:
This variable conditionally defines the HAS_PTHREAD_ATFORK
symbol,
which indicates to the C program that the pthread_atfork()
routine is available.
From d_pthread_attr_ss.U:
This variable conditionally defines HAS_PTHREAD_ATTR_SETSCOPE
if
pthread_attr_setscope() is available to set the contention scope
attribute of a thread attribute object.
From d_pthread_y.U:
This variable conditionally defines the HAS_PTHREAD_YIELD
symbol if the pthread_yield routine is available to yield
the execution of the current thread.
From i_pwd.U:
This variable conditionally defines PWAGE
, which indicates
that struct passwd contains pw_age.
From i_pwd.U:
This variable conditionally defines PWCHANGE
, which indicates
that struct passwd contains pw_change.
From i_pwd.U:
This variable conditionally defines PWCLASS
, which indicates
that struct passwd contains pw_class.
From i_pwd.U:
This variable conditionally defines PWCOMMENT
, which indicates
that struct passwd contains pw_comment.
From i_pwd.U:
This variable conditionally defines PWEXPIRE
, which indicates
that struct passwd contains pw_expire.
From i_pwd.U:
This variable conditionally defines PWGECOS
, which indicates
that struct passwd contains pw_gecos.
From i_pwd.U:
This variable conditionally defines PWPASSWD
, which indicates
that struct passwd contains pw_passwd.
From i_pwd.U:
This variable conditionally defines PWQUOTA
, which indicates
that struct passwd contains pw_quota.
From d_qgcvt.U:
This variable conditionally defines the HAS_QGCVT
symbol, which
indicates to the C program that the qgcvt() routine is available.
From quadtype.U:
This variable, if defined, tells that there's a 64-bit integer type, quadtype.
From d_random_r.U:
This variable conditionally defines the HAS_RANDOM_R
symbol,
which indicates to the C program that the random_r()
routine is available.
From d_readdir64_r.U:
This variable conditionally defines the HAS_READDIR64_R symbol, which indicates to the C program that the readdir64_r() routine is available.
From d_readdir.U:
This variable conditionally defines HAS_READDIR
if readdir() is
available to read directory entries.
From d_readdir_r.U:
This variable conditionally defines the HAS_READDIR_R
symbol,
which indicates to the C program that the readdir_r()
routine is available.
From d_readlink.U:
This variable conditionally defines the HAS_READLINK
symbol, which
indicates to the C program that the readlink() routine is available
to read the value of a symbolic link.
From d_readv.U:
This variable conditionally defines the HAS_READV
symbol, which
indicates to the C program that the readv() routine is available.
From d_recvmsg.U:
This variable conditionally defines the HAS_RECVMSG
symbol, which
indicates to the C program that the recvmsg() routine is available.
From d_rename.U:
This variable conditionally defines the HAS_RENAME
symbol, which
indicates to the C program that the rename() routine is available
to rename files.
From d_readdir.U:
This variable conditionally defines HAS_REWINDDIR
if rewinddir() is
available.
From d_rmdir.U:
This variable conditionally defines HAS_RMDIR
if rmdir() is
available to remove directories.
From d_safebcpy.U:
This variable conditionally defines the HAS_SAFE_BCOPY
symbol if
the bcopy() routine can do overlapping copies. Normally, you
should probably use memmove().
From d_safemcpy.U:
This variable conditionally defines the HAS_SAFE_MEMCPY
symbol if
the memcpy() routine can do overlapping copies.
For overlapping copies, memmove() should be used, if available.
From d_sanemcmp.U:
This variable conditionally defines the HAS_SANE_MEMCMP
symbol if
the memcpy() routine is available and can be used to compare relative
magnitudes of chars with their high bits set.
From d_sbrkproto.U:
This variable conditionally defines the HAS_SBRK_PROTO
symbol,
which indicates to the C program that the system provides
a prototype for the sbrk() function. Otherwise, it is
up to the program to supply one.
From d_scalbnl.U:
This variable conditionally defines the HAS_SCALBNL
symbol, which
indicates to the C program that the scalbnl() routine is available.
If ilogbl is also present we can emulate frexpl.
From d_pthread_y.U:
This variable conditionally defines the HAS_SCHED_YIELD
symbol if the sched_yield routine is available to yield
the execution of the current thread.
From d_socket.U:
This variable conditionally defines the HAS_SCM_RIGHTS
symbol,
which indicates that the SCM_RIGHTS
is available. #ifdef is
not enough because it may be an enum, glibc has been known to do this.
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that stdio has a symbol to scan long doubles.
From d_readdir.U:
This variable conditionally defines HAS_SEEKDIR
if seekdir() is
available.
From d_select.U:
This variable conditionally defines HAS_SELECT
if select() is
available to select active file descriptors. A <sys/time.h>
inclusion may be necessary for the timeout field.
From d_sem.U:
This variable conditionally defines the HAS_SEM
symbol, which
indicates that the entire sem*(2) library is present.
From d_semctl.U:
This variable conditionally defines the HAS_SEMCTL
symbol, which
indicates to the C program that the semctl() routine is available.
From d_union_semun.U:
This variable conditionally defines USE_SEMCTL_SEMID_DS
, which
indicates that struct semid_ds * is to be used for semctl IPC_STAT
.
From d_union_semun.U:
This variable conditionally defines USE_SEMCTL_SEMUN
, which
indicates that union semun is to be used for semctl IPC_STAT
.
From d_semget.U:
This variable conditionally defines the HAS_SEMGET
symbol, which
indicates to the C program that the semget() routine is available.
From d_semop.U:
This variable conditionally defines the HAS_SEMOP
symbol, which
indicates to the C program that the semop() routine is available.
From d_sendmsg.U:
This variable conditionally defines the HAS_SENDMSG
symbol, which
indicates to the C program that the sendmsg() routine is available.
From d_setegid.U:
This variable conditionally defines the HAS_SETEGID
symbol, which
indicates to the C program that the setegid() routine is available
to change the effective gid of the current program.
From d_seteuid.U:
This variable conditionally defines the HAS_SETEUID
symbol, which
indicates to the C program that the seteuid() routine is available
to change the effective uid of the current program.
From d_setgrent.U:
This variable conditionally defines the HAS_SETGRENT
symbol, which
indicates to the C program that the setgrent() routine is available
for initializing sequential access to the group database.
From d_setgrent_r.U:
This variable conditionally defines the HAS_SETGRENT_R
symbol,
which indicates to the C program that the setgrent_r()
routine is available.
From d_setgrps.U:
This variable conditionally defines the HAS_SETGROUPS
symbol, which
indicates to the C program that the setgroups() routine is available
to set the list of process groups.
From d_sethent.U:
This variable conditionally defines HAS_SETHOSTENT
if sethostent() is
available.
From d_sethostent_r.U:
This variable conditionally defines the HAS_SETHOSTENT_R
symbol,
which indicates to the C program that the sethostent_r()
routine is available.
From d_setitimer.U:
This variable conditionally defines the HAS_SETITIMER
symbol, which
indicates to the C program that the setitimer() routine is available.
From d_setlnbuf.U:
This variable conditionally defines the HAS_SETLINEBUF
symbol, which
indicates to the C program that the setlinebuf() routine is available
to change stderr or stdout from block-buffered or unbuffered to a
line-buffered mode.
From d_setlocale.U:
This variable conditionally defines HAS_SETLOCALE
if setlocale() is
available to handle locale-specific ctype implementations.
From d_setlocale_r.U:
This variable conditionally defines the HAS_SETLOCALE_R
symbol,
which indicates to the C program that the setlocale_r()
routine is available.
From d_setnent.U:
This variable conditionally defines HAS_SETNETENT
if setnetent() is
available.
From d_setnetent_r.U:
This variable conditionally defines the HAS_SETNETENT_R
symbol,
which indicates to the C program that the setnetent_r()
routine is available.
From d_setpent.U:
This variable conditionally defines HAS_SETPROTOENT
if setprotoent() is
available.
From d_setpgid.U:
This variable conditionally defines the HAS_SETPGID
symbol if the
setpgid(pid, gpid) function is available to set process group ID
.
From d_setpgrp2.U:
This variable conditionally defines the HAS_SETPGRP2 symbol, which
indicates to the C program that the setpgrp2() (as in DG/UX
) routine
is available to set the current process group.
From d_setpgrp.U:
This variable conditionally defines HAS_SETPGRP
if setpgrp() is
available to set the current process group.
From d_setprior.U:
This variable conditionally defines HAS_SETPRIORITY
if setpriority()
is available to set a process's priority.
From d_setproctitle.U:
This variable conditionally defines the HAS_SETPROCTITLE
symbol,
which indicates to the C program that the setproctitle() routine
is available.
From d_setprotoent_r.U:
This variable conditionally defines the HAS_SETPROTOENT_R
symbol,
which indicates to the C program that the setprotoent_r()
routine is available.
From d_setpwent.U:
This variable conditionally defines the HAS_SETPWENT
symbol, which
indicates to the C program that the setpwent() routine is available
for initializing sequential access to the passwd database.
From d_setpwent_r.U:
This variable conditionally defines the HAS_SETPWENT_R
symbol,
which indicates to the C program that the setpwent_r()
routine is available.
From d_setregid.U:
This variable conditionally defines HAS_SETREGID
if setregid() is
available to change the real and effective gid of the current
process.
From d_setregid.U:
This variable conditionally defines HAS_SETRESGID
if setresgid() is
available to change the real, effective and saved gid of the current
process.
From d_setreuid.U:
This variable conditionally defines HAS_SETREUID
if setresuid() is
available to change the real, effective and saved uid of the current
process.
From d_setreuid.U:
This variable conditionally defines HAS_SETREUID
if setreuid() is
available to change the real and effective uid of the current
process.
From d_setrgid.U:
This variable conditionally defines the HAS_SETRGID
symbol, which
indicates to the C program that the setrgid() routine is available
to change the real gid of the current program.
From d_setruid.U:
This variable conditionally defines the HAS_SETRUID
symbol, which
indicates to the C program that the setruid() routine is available
to change the real uid of the current program.
From d_setsent.U:
This variable conditionally defines HAS_SETSERVENT
if setservent() is
available.
From d_setservent_r.U:
This variable conditionally defines the HAS_SETSERVENT_R
symbol,
which indicates to the C program that the setservent_r()
routine is available.
From d_setsid.U:
This variable conditionally defines HAS_SETSID
if setsid() is
available to set the process group ID
.
From d_setvbuf.U:
This variable conditionally defines the HAS_SETVBUF
symbol, which
indicates to the C program that the setvbuf() routine is available
to change buffering on an open stdio stream.
From d_sfio.U:
This variable conditionally defines the USE_SFIO
symbol,
and indicates whether sfio is available (and should be used).
From d_shm.U:
This variable conditionally defines the HAS_SHM
symbol, which
indicates that the entire shm*(2) library is present.
From d_shmat.U:
This variable conditionally defines the HAS_SHMAT
symbol, which
indicates to the C program that the shmat() routine is available.
From d_shmat.U:
This variable conditionally defines the HAS_SHMAT_PROTOTYPE
symbol, which indicates that sys/shm.h has a prototype for
shmat.
From d_shmctl.U:
This variable conditionally defines the HAS_SHMCTL
symbol, which
indicates to the C program that the shmctl() routine is available.
From d_shmdt.U:
This