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- # signalblocking.m4 serial 10
- dnl Copyright (C) 2001-2002, 2006-2009 Free Software Foundation, Inc.
- dnl This file is free software; the Free Software Foundation
- dnl gives unlimited permission to copy and/or distribute it,
- dnl with or without modifications, as long as this notice is preserved.
- # Determine available signal blocking primitives. Three different APIs exist:
- # 1) POSIX: sigemptyset, sigaddset, sigprocmask
- # 2) SYSV: sighold, sigrelse
- # 3) BSD: sigblock, sigsetmask
- # For simplicity, here we check only for the POSIX signal blocking.
- AC_DEFUN([gl_SIGNALBLOCKING],
- [
- AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
- signals_not_posix=
- AC_EGREP_HEADER([sigset_t], [signal.h], , [signals_not_posix=1])
- if test -z "$signals_not_posix"; then
- AC_CHECK_FUNC([sigprocmask], [gl_cv_func_sigprocmask=1])
- fi
- if test -z "$gl_cv_func_sigprocmask"; then
- HAVE_POSIX_SIGNALBLOCKING=0
- AC_LIBOBJ([sigprocmask])
- gl_PREREQ_SIGPROCMASK
- fi
- ])
- # Prerequisites of the part of lib/signal.in.h and of lib/sigprocmask.c.
- AC_DEFUN([gl_PREREQ_SIGPROCMASK],
- [
- AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
- AC_CHECK_TYPES([sigset_t],
- [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no],
- [#include <signal.h>
- /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
- #include <sys/types.h>])
- if test $gl_cv_type_sigset_t != yes; then
- HAVE_SIGSET_T=0
- fi
- dnl HAVE_SIGSET_T is 1 if the system lacks the sigprocmask function but has
- dnl the sigset_t type.
- AC_SUBST([HAVE_SIGSET_T])
- ])
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