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