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59 lines
2.2 KiB
59 lines
2.2 KiB
14 years ago
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# signal_h.m4 serial 12
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dnl Copyright (C) 2007-2011 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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AC_DEFUN([gl_SIGNAL_H],
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[
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AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
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gl_NEXT_HEADERS([signal.h])
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# AIX declares sig_atomic_t to already include volatile, and C89 compilers
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# then choke on 'volatile sig_atomic_t'. C99 requires that it compile.
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AC_CHECK_TYPE([volatile sig_atomic_t], [],
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[HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=0], [[
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#include <signal.h>
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]])
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AC_REQUIRE([AC_TYPE_UID_T])
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dnl Persuade glibc <signal.h> to define sighandler_t.
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AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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AC_CHECK_TYPE([sighandler_t], [], [HAVE_SIGHANDLER_T=0], [[
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#include <signal.h>
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]])
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dnl Check for declarations of anything we want to poison if the
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dnl corresponding gnulib module is not in use.
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gl_WARN_ON_USE_PREPARE([[#include <signal.h>
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]], [sigaction sigaddset sigdelset sigemptyset sigfillset sigismember
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sigpending sigprocmask])
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])
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AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR],
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[
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dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
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AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
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gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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dnl Define it also as a C macro, for the benefit of the unit tests.
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gl_MODULE_INDICATOR_FOR_TESTS([$1])
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])
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AC_DEFUN([gl_SIGNAL_H_DEFAULTS],
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[
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GNULIB_SIGNAL_H_SIGPIPE=0; AC_SUBST([GNULIB_SIGNAL_H_SIGPIPE])
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GNULIB_SIGPROCMASK=0; AC_SUBST([GNULIB_SIGPROCMASK])
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GNULIB_SIGACTION=0; AC_SUBST([GNULIB_SIGACTION])
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dnl Assume proper GNU behavior unless another module says otherwise.
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HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING])
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HAVE_SIGSET_T=1; AC_SUBST([HAVE_SIGSET_T])
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HAVE_SIGINFO_T=1; AC_SUBST([HAVE_SIGINFO_T])
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HAVE_SIGACTION=1; AC_SUBST([HAVE_SIGACTION])
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HAVE_STRUCT_SIGACTION_SA_SIGACTION=1;
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AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION])
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HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1;
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AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T])
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HAVE_SIGHANDLER_T=1; AC_SUBST([HAVE_SIGHANDLER_T])
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])
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