1dnl Copyright 2010 The Kyua Authors. 2dnl All rights reserved. 3dnl 4dnl Redistribution and use in source and binary forms, with or without 5dnl modification, are permitted provided that the following conditions are 6dnl met: 7dnl 8dnl * Redistributions of source code must retain the above copyright 9dnl notice, this list of conditions and the following disclaimer. 10dnl * Redistributions in binary form must reproduce the above copyright 11dnl notice, this list of conditions and the following disclaimer in the 12dnl documentation and/or other materials provided with the distribution. 13dnl * Neither the name of Google Inc. nor the names of its contributors 14dnl may be used to endorse or promote products derived from this software 15dnl without specific prior written permission. 16dnl 17dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18dnl "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21dnl OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22dnl SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23dnl LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24dnl DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25dnl THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26dnl (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27dnl OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29dnl 30dnl KYUA_LAST_SIGNO 31dnl 32dnl Detect the last valid signal number. 33dnl 34AC_DEFUN([KYUA_LAST_SIGNO], [ 35 AC_CACHE_CHECK( 36 [for the last valid signal], 37 [kyua_cv_signals_lastno], [ 38 AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <err.h> 39#include <errno.h> 40#include <signal.h> 41#include <stdio.h> 42#include <stdio.h> 43#include <stdlib.h>], [ 44 static const int max_signals = 256; 45 int i; 46 FILE *f; 47 48 i = 0; 49 while (i < max_signals) { 50 i++; 51 if (i != SIGKILL && i != SIGSTOP) { 52 struct sigaction sa; 53 int ret; 54 55 sa.sa_handler = SIG_DFL; 56 sigemptyset(&sa.sa_mask); 57 sa.sa_flags = 0; 58 59 ret = sigaction(i, &sa, NULL); 60 if (ret == -1) { 61 warn("sigaction(%d) failed", i); 62 if (errno == EINVAL) { 63 i--; 64 break; 65 } else 66 err(EXIT_FAILURE, "sigaction failed"); 67 } 68 } 69 } 70 if (i == max_signals) 71 errx(EXIT_FAILURE, "too many signals"); 72 73 f = fopen("conftest.cnt", "w"); 74 if (f == NULL) 75 err(EXIT_FAILURE, "failed to open file"); 76 77 fprintf(f, "%d\n", i); 78 fclose(f); 79 80 return EXIT_SUCCESS; 81])], 82 [if test ! -f conftest.cnt; then 83 kyua_cv_signals_lastno=15 84 else 85 kyua_cv_signals_lastno=$(cat conftest.cnt) 86 rm -f conftest.cnt 87 fi], 88 [kyua_cv_signals_lastno=15]) 89 ]) 90 AC_DEFINE_UNQUOTED([LAST_SIGNO], [${kyua_cv_signals_lastno}], 91 [Define to the last valid signal number]) 92]) 93