1# unionwait.m4 serial 1 (gettext-0.11) 2dnl Copyright (C) 1993-2002 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7dnl Taken from GNU make 3.79.1. 8 9AC_DEFUN([gt_UNION_WAIT], 10[ 11AC_CHECK_FUNCS(waitpid) 12AC_MSG_CHECKING(for union wait) 13AC_CACHE_VAL(gt_cv_union_wait, [dnl 14AC_TRY_LINK([#include <sys/types.h> 15#include <sys/wait.h>], 16 [union wait status; int pid; pid = wait (&status); 17#ifdef WEXITSTATUS 18/* Some POSIXoid systems have both the new-style macros and the old 19 union wait type, and they do not work together. If union wait 20 conflicts with WEXITSTATUS et al, we don't want to use it at all. */ 21if (WEXITSTATUS (status) != 0) pid = -1; 22#ifdef WTERMSIG 23/* If we have WEXITSTATUS and WTERMSIG, just use them on ints. */ 24-- blow chunks here -- 25#endif 26#endif 27#ifdef HAVE_WAITPID 28/* Make sure union wait works with waitpid. */ 29pid = waitpid (-1, &status, 0); 30#endif 31], 32 [gt_cv_union_wait=yes], [gt_cv_union_wait=no])]) 33if test "$gt_cv_union_wait" = yes; then 34 AC_DEFINE(HAVE_UNION_WAIT, 1, 35 [Define if <sys/wait.h> defines the 'union wait' type.]) 36fi 37AC_MSG_RESULT($gt_cv_union_wait) 38]) 39