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(_AC_FUNC_GETPGRP_TEST): Remove.

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(AC_FUNC_GETPGRP): Don't bother with a runtime test.  Just check
whether it is a (compile-time) error to pass an argument to
getpgrp.  This simpler test supports the revised documentation,
and is all that AC_FUNC_GETPGRP's users really need.
This commit is contained in:
Paul Eggert 2001-09-18 16:21:46 +00:00
parent 23bdb70e0c
commit 994851e7de
1 changed files with 6 additions and 77 deletions
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83
lib/autoconf/functions.m4
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@ -594,91 +594,20 @@ AC_CHECK_FUNC(getmntent,
[Define if you have the `getmntent' function.])])])
# _AC_FUNC_GETPGRP_TEST
# ---------------------
# A program that exits with success iff `getpgrp' seems to ignore its
# argument.
m4_define([_AC_FUNC_GETPGRP_TEST],
[AC_LANG_SOURCE([AC_INCLUDES_DEFAULT]
[[
/*
* If this system has a BSD-style getpgrp(),
* which takes a pid argument, exit unsuccessfully.
*
* Snarfed from Chet Ramey's bash pgrp.c test program
*/
int pid;
int pg1, pg2, pg3, pg4;
int ng, np, s, child;
int
main ()
{
pid = getpid ();
pg1 = getpgrp (0);
pg2 = getpgrp ();
pg3 = getpgrp (pid);
pg4 = getpgrp (1);
/* If all of these values are the same, it's pretty sure that we're
on a system that ignores getpgrp's first argument. */
if (pg2 == pg4 && pg1 == pg3 && pg2 == pg3)
exit (0);
child = fork ();
if (child < 0)
exit(1);
else if (child == 0)
{
np = getpid ();
/* If this is Sys V, this will not work; pgrp will be set to np
because setpgrp just changes a pgrp to be the same as the
pid. */
setpgrp (np, pg1);
ng = getpgrp (0); /* Same result for Sys V and BSD */
if (ng == pg1)
exit (1);
else
exit (0);
}
else
{
wait (&s);
exit (s>>8);
}
}]])
])# _AC_FUNC_GETPGRP_TEST
# AC_FUNC_GETPGRP
# ---------------
# Figure out whether getpgrp takes an argument or not. Try first using
# prototypes (AC_COMPILE), and if the compiler is of no help, try a runtime
# test.
# Figure out whether getpgrp requires zero arguments.
AC_DEFUN([AC_FUNC_GETPGRP],
[AC_CACHE_CHECK(whether getpgrp takes no argument, ac_cv_func_getpgrp_void,
[AC_CACHE_CHECK(whether getpgrp requires zero arguments,
ac_cv_func_getpgrp_void,
[# Use it with a single arg.
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT], [getpgrp (0);])],
[ac_func_getpgrp_1=yes],
[ac_func_getpgrp_1=no])
# Use it with no arg.
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT], [getpgrp ();])],
[ac_func_getpgrp_0=yes],
[ac_func_getpgrp_0=no])
# If both static checks agree, we are done.
case $ac_func_getpgrp_0:$ac_func_getpgrp_1 in
yes:no) ac_cv_func_getpgrp_void=yes;;
no:yes) ac_cv_func_getpgrp_void=false;;
*) AC_RUN_IFELSE([_AC_FUNC_GETPGRP_TEST],
[ac_cv_func_getpgrp_void=yes],
[ac_cv_func_getpgrp_void=no],
[AC_MSG_ERROR([cannot check getpgrp if cross compiling])]);;
esac # $ac_func_getpgrp_0:$ac_func_getpgrp_1
[ac_cv_func_getpgrp_void=no],
[ac_cv_func_getpgrp_void=yes])
])
if test $ac_cv_func_getpgrp_void = yes; then
AC_DEFINE(GETPGRP_VOID, 1,
[Define if the `getpgrp' function takes no argument.])
[Define if the `getpgrp' function requires zero arguments.])
fi
])# AC_FUNC_GETPGRP