| Ying Wang | 0543663 | 2013-04-05 16:01:00 -0700 | [diff] [blame] | 1 | # signalblocking.m4 serial 14 |
| 2 | dnl Copyright (C) 2001-2002, 2006-2012 Free Software Foundation, Inc. |
| 3 | dnl This file is free software; the Free Software Foundation |
| 4 | dnl gives unlimited permission to copy and/or distribute it, |
| 5 | dnl with or without modifications, as long as this notice is preserved. |
| 6 | |
| 7 | # Determine available signal blocking primitives. Three different APIs exist: |
| 8 | # 1) POSIX: sigemptyset, sigaddset, sigprocmask |
| 9 | # 2) SYSV: sighold, sigrelse |
| 10 | # 3) BSD: sigblock, sigsetmask |
| 11 | # For simplicity, here we check only for the POSIX signal blocking. |
| 12 | AC_DEFUN([gl_SIGNALBLOCKING], |
| 13 | [ |
| 14 | AC_REQUIRE([gl_SIGNAL_H_DEFAULTS]) |
| 15 | AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T]) |
| 16 | if test $gl_cv_type_sigset_t = yes; then |
| 17 | AC_CHECK_FUNC([sigprocmask], [gl_cv_func_sigprocmask=1]) |
| 18 | fi |
| 19 | if test -z "$gl_cv_func_sigprocmask"; then |
| 20 | HAVE_POSIX_SIGNALBLOCKING=0 |
| 21 | fi |
| 22 | ]) |
| 23 | |
| 24 | # Prerequisites of lib/sigprocmask.c. |
| 25 | AC_DEFUN([gl_PREREQ_SIGPROCMASK], [:]) |