mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 19:30:10 +00:00
139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/* Bug 18125: Verify setcontext calls exit() and not _exit().
|
|
Copyright (C) 2015-2016 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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <ucontext.h>
|
|
#include <unistd.h>
|
|
#include <limits.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
|
|
/* Please note that depending on the outcome of Bug 18135 this test
|
|
may become invalid, and instead of testing for calling exit it
|
|
should be reworked to test for the last context calling
|
|
pthread_exit(). */
|
|
|
|
static ucontext_t ctx;
|
|
static char *filename;
|
|
|
|
/* It is intended that this function does nothing. */
|
|
static void
|
|
cf (void)
|
|
{
|
|
printf ("called context function\n");
|
|
}
|
|
|
|
static void
|
|
exit_called (void)
|
|
{
|
|
int fd;
|
|
ssize_t res;
|
|
const char buf[] = "Called exit function\n";
|
|
|
|
fd = open (filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
|
|
if (fd == -1)
|
|
{
|
|
printf ("FAIL: Unable to create test file %s\n", filename);
|
|
exit (1);
|
|
}
|
|
res = write (fd, buf, sizeof (buf));
|
|
if (res != sizeof (buf))
|
|
{
|
|
printf ("FAIL: Expected to write test file in one write call.\n");
|
|
exit (1);
|
|
}
|
|
res = close (fd);
|
|
if (res == -1)
|
|
{
|
|
printf ("FAIL: Failed to close test file.\n");
|
|
exit (1);
|
|
}
|
|
printf ("PASS: %s", buf);
|
|
}
|
|
|
|
/* The test expects a filename given by the wrapper calling script.
|
|
The test then registers an atexit handler that will create the
|
|
file to indicate that the atexit handler ran. Then the test
|
|
creates a context, modifies it with makecontext, and sets it.
|
|
The context has only a single context which then must exit.
|
|
If it incorrectly exits via _exit then the atexit handler is
|
|
not run, the file is not created, and the wrapper detects this
|
|
and fails the test. This test cannot be done using an _exit
|
|
interposer since setcontext avoids the PLT and calls _exit
|
|
directly. */
|
|
static int
|
|
do_test (int argc, char **argv)
|
|
{
|
|
int ret;
|
|
char st1[32768];
|
|
ucontext_t tempctx = ctx;
|
|
|
|
if (argc < 2)
|
|
{
|
|
printf ("FAIL: Test missing filename argument.\n");
|
|
exit (1);
|
|
}
|
|
|
|
filename = argv[1];
|
|
|
|
atexit (exit_called);
|
|
|
|
puts ("making contexts");
|
|
if (getcontext (&ctx) != 0)
|
|
{
|
|
if (errno == ENOSYS)
|
|
{
|
|
/* Exit with 77 to mark the test as UNSUPPORTED. */
|
|
printf ("UNSUPPORTED: getcontext not implemented.\n");
|
|
exit (77);
|
|
}
|
|
|
|
printf ("FAIL: getcontext failed.\n");
|
|
exit (1);
|
|
}
|
|
|
|
ctx.uc_stack.ss_sp = st1;
|
|
ctx.uc_stack.ss_size = sizeof (st1);
|
|
ctx.uc_link = 0;
|
|
makecontext (&ctx, cf, 0);
|
|
|
|
/* Without this check, a stub makecontext can make us spin forever. */
|
|
if (memcmp (&tempctx, &ctx, sizeof ctx) == 0)
|
|
{
|
|
puts ("UNSUPPORTED: makecontext was a no-op, presuming not implemented");
|
|
exit (77);
|
|
}
|
|
|
|
ret = setcontext (&ctx);
|
|
if (ret != 0)
|
|
{
|
|
printf ("FAIL: setcontext returned with %d and errno of %d.\n", ret, errno);
|
|
exit (1);
|
|
}
|
|
|
|
printf ("FAIL: Impossibly returned to main.\n");
|
|
exit (1);
|
|
}
|
|
|
|
#include "../test-skeleton.c"
|