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dnl ### Check for whether setsid() is allowed within vfork()
dnl (Mac OS X 10.3 (Panther, 11/2003) is one O/S which does not allow this.)
AC_DEFUN([XDVI_FUNC_SETSID_IN_VFORK],
[if test $ac_cv_func_vfork_works = yes; then
AC_CACHE_CHECK([for whether setsid() is allowed within vfork()],
xdvi_cv_setsid_in_vfork,
[AC_TRY_RUN(
[/* Test adapted from Gnu autoconf */
/* Thanks to Paul Eggert for this test. */
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_VFORK_H
#include <vfork.h>
#endif
int
main() {
pid_t parent = getpid ();
pid_t child;
child = vfork ();
if (child == 0) {
if (setsid () == -1)
_exit(1);
_exit(0);
} else {
int status;
while (wait(&status) != child)
;
exit(
/* Was there some problem with vforking? */
child < 0
/* Did the child fail? (This shouldn't happen.) */
|| status
);
}
}],
xdvi_cv_setsid_in_vfork=yes,
xdvi_cv_setsid_in_vfork=no,
# safe value for cross-compiling
xdvi_cv_setsid_in_vfork=no)])
if test $xdvi_cv_setsid_in_vfork = yes; then
AC_DEFINE([HAVE_GOOD_SETSID_VFORK], 1,
[Define if your system allows setsid() within vfork().])
fi]
fi)
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