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Diffstat (limited to 'htl/tests/test-4.c')
-rw-r--r-- | htl/tests/test-4.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/htl/tests/test-4.c b/htl/tests/test-4.c new file mode 100644 index 0000000000..b8c24b78f1 --- /dev/null +++ b/htl/tests/test-4.c @@ -0,0 +1,102 @@ +/* Test the stack guard. + Copyright (C) 2000-2018 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If + not, see <http://www.gnu.org/licenses/>. */ + +#define _GNU_SOURCE + +#include <pthread.h> +#include <assert.h> +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <stdio.h> + +size_t stacksize; + +void * +thr (void *arg) +{ + int i; + char *foo; + + foo = alloca (3 * stacksize / 4); + for (i = 0; i < sizeof foo; i++) + foo[i] = -1; + + return (void *) 1; +} + +int +main (int argc, char *argv[]) +{ + error_t err; + pid_t child; + + child = fork (); + switch (child) + { + case -1: + error (1, errno, "fork"); + break; + + case 0: + { + pthread_attr_t attr; + pthread_t tid; + void *ret; + + err = pthread_attr_init (&attr); + assert_perror (err); + + err = pthread_attr_getstacksize (&attr, &stacksize); + assert_perror (err); + + err = pthread_attr_setguardsize (&attr, stacksize / 2); + if (err == ENOTSUP) + { + printf ("Stack guard attribute not supported.\n"); + return 1; + } + assert_perror (err); + + err = pthread_create (&tid, &attr, thr, 0); + assert_perror (err); + + err = pthread_attr_destroy (&attr); + assert_perror (err); + + err = pthread_join (tid, &ret); + /* Should never be successful. */ + printf ("Thread did not segfault!?!\n"); + assert_perror (err); + return 0; + } + + default: + { + pid_t pid; + int status; + + pid = waitpid (child, &status, 0); + printf ("pid = %d; child = %d; status = %d\n", pid, child, status); + assert (pid == child); + assert (status != 0); + } + } + + return 0; +} |