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-rw-r--r--m4/signals.m492
1 files changed, 92 insertions, 0 deletions
diff --git a/m4/signals.m4 b/m4/signals.m4
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index 000000000000..8e8b56e1eb73
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+++ b/m4/signals.m4
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+dnl Copyright 2010 The Kyua Authors.
+dnl All rights reserved.
+dnl
+dnl Redistribution and use in source and binary forms, with or without
+dnl modification, are permitted provided that the following conditions are
+dnl met:
+dnl
+dnl * Redistributions of source code must retain the above copyright
+dnl notice, this list of conditions and the following disclaimer.
+dnl * Redistributions in binary form must reproduce the above copyright
+dnl notice, this list of conditions and the following disclaimer in the
+dnl documentation and/or other materials provided with the distribution.
+dnl * Neither the name of Google Inc. nor the names of its contributors
+dnl may be used to endorse or promote products derived from this software
+dnl without specific prior written permission.
+dnl
+dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+dnl "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+dnl OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+dnl SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+dnl LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+dnl DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+dnl THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+dnl (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+dnl OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+dnl
+dnl KYUA_LAST_SIGNO
+dnl
+dnl Detect the last valid signal number.
+dnl
+AC_DEFUN([KYUA_LAST_SIGNO], [
+ AC_CACHE_CHECK(
+ [for the last valid signal],
+ [kyua_cv_signals_lastno], [
+ AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <err.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdio.h>
+#include <stdlib.h>], [
+ static const int max_signals = 256;
+ int i;
+ FILE *f;
+
+ i = 0;
+ while (i < max_signals) {
+ i++;
+ if (i != SIGKILL && i != SIGSTOP) {
+ struct sigaction sa;
+ int ret;
+
+ sa.sa_handler = SIG_DFL;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = 0;
+
+ ret = sigaction(i, &sa, NULL);
+ if (ret == -1) {
+ warn("sigaction(%d) failed", i);
+ if (errno == EINVAL) {
+ i--;
+ break;
+ } else
+ err(EXIT_FAILURE, "sigaction failed");
+ }
+ }
+ }
+ if (i == max_signals)
+ errx(EXIT_FAILURE, "too many signals");
+
+ f = fopen("conftest.cnt", "w");
+ if (f == NULL)
+ err(EXIT_FAILURE, "failed to open file");
+
+ fprintf(f, "%d\n", i);
+ fclose(f);
+
+ return EXIT_SUCCESS;
+])],
+ [if test ! -f conftest.cnt; then
+ kyua_cv_signals_lastno=15
+ else
+ kyua_cv_signals_lastno=$(cat conftest.cnt)
+ rm -f conftest.cnt
+ fi],
+ [kyua_cv_signals_lastno=15])
+ ])
+ AC_DEFINE_UNQUOTED([LAST_SIGNO], [${kyua_cv_signals_lastno}],
+ [Define to the last valid signal number])
+])