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comparison m4/strcasestr.m4 @ 10189:2304e9103317

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Work around environments that (stupidly) ignore SIGALRM. * m4/strstr.m4 (gl_FUNC_STRSTR): Reset SIGALRM to default handling before using alarm(). * m4/strcasestr.m4 (gl_FUNC_STRCASESTR): Likewise. * m4/memmem.m4 (gl_FUNC_MEMMEM): Likewise. Reported by Ian Beckwith <ianb@erislabs.net>. Signed-off-by: Eric Blake <ebb9@byu.net>
author Eric Blake <ebb9@byu.net>
date Mon, 09 Jun 2008 16:21:34 -0600
parents 44e8848f6ce8
children 59047bad770e
comparison
equal deleted inserted replaced
10188:d97126852324 10189:2304e9103317
1 # strcasestr.m4 serial 11 1 # strcasestr.m4 serial 12
2 dnl Copyright (C) 2005, 2007, 2008 Free Software Foundation, Inc. 2 dnl Copyright (C) 2005, 2007, 2008 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation 3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it, 4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved. 5 dnl with or without modifications, as long as this notice is preserved.
6 6
24 AC_REQUIRE([gl_FUNC_STRCASESTR_SIMPLE]) 24 AC_REQUIRE([gl_FUNC_STRCASESTR_SIMPLE])
25 if test $ac_cv_func_strcasestr = yes; then 25 if test $ac_cv_func_strcasestr = yes; then
26 AC_CACHE_CHECK([whether strcasestr works in linear time], 26 AC_CACHE_CHECK([whether strcasestr works in linear time],
27 [gl_cv_func_strcasestr_linear], 27 [gl_cv_func_strcasestr_linear],
28 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ 28 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
29 #include <signal.h> /* for signal */
29 #include <string.h> /* for memmem */ 30 #include <string.h> /* for memmem */
30 #include <stdlib.h> /* for malloc */ 31 #include <stdlib.h> /* for malloc */
31 #include <unistd.h> /* for alarm */ 32 #include <unistd.h> /* for alarm */
32 ]], [[size_t m = 1000000; 33 ]], [[size_t m = 1000000;
33 char *haystack = (char *) malloc (2 * m + 2); 34 char *haystack = (char *) malloc (2 * m + 2);
34 char *needle = (char *) malloc (m + 2); 35 char *needle = (char *) malloc (m + 2);
35 void *result = 0; 36 void *result = 0;
36 /* Failure to compile this test due to missing alarm is okay, 37 /* Failure to compile this test due to missing alarm is okay,
37 since all such platforms (mingw) also lack strcasestr. */ 38 since all such platforms (mingw) also lack strcasestr. */
39 signal (SIGALRM, SIG_DFL);
38 alarm (5); 40 alarm (5);
39 /* Check for quadratic performance. */ 41 /* Check for quadratic performance. */
40 if (haystack && needle) 42 if (haystack && needle)
41 { 43 {
42 memset (haystack, 'A', 2 * m); 44 memset (haystack, 'A', 2 * m);