139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/* Bug 18125: Verify setcontext calls exit() and not _exit().
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Copyright (C) 2015-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ucontext.h>
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#include <unistd.h>
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#include <limits.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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/* Please note that depending on the outcome of Bug 18135 this test
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may become invalid, and instead of testing for calling exit it
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should be reworked to test for the last context calling
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pthread_exit(). */
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static ucontext_t ctx;
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static char *filename;
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/* It is intended that this function does nothing. */
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static void
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cf (void)
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{
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printf ("called context function\n");
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}
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static void
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exit_called (void)
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{
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int fd;
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ssize_t res;
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const char buf[] = "Called exit function\n";
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fd = open (filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
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if (fd == -1)
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{
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printf ("FAIL: Unable to create test file %s\n", filename);
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exit (1);
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}
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res = write (fd, buf, sizeof (buf));
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if (res != sizeof (buf))
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{
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printf ("FAIL: Expected to write test file in one write call.\n");
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exit (1);
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}
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res = close (fd);
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if (res == -1)
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{
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printf ("FAIL: Failed to close test file.\n");
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exit (1);
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}
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printf ("PASS: %s", buf);
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}
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/* The test expects a filename given by the wrapper calling script.
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The test then registers an atexit handler that will create the
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file to indicate that the atexit handler ran. Then the test
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creates a context, modifies it with makecontext, and sets it.
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The context has only a single context which then must exit.
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If it incorrectly exits via _exit then the atexit handler is
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not run, the file is not created, and the wrapper detects this
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and fails the test. This test cannot be done using an _exit
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interposer since setcontext avoids the PLT and calls _exit
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directly. */
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static int
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do_test (int argc, char **argv)
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{
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int ret;
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char st1[32768];
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ucontext_t tempctx = ctx;
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if (argc < 2)
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{
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printf ("FAIL: Test missing filename argument.\n");
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exit (1);
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}
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filename = argv[1];
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atexit (exit_called);
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puts ("making contexts");
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if (getcontext (&ctx) != 0)
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{
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if (errno == ENOSYS)
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{
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/* Exit with 77 to mark the test as UNSUPPORTED. */
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printf ("UNSUPPORTED: getcontext not implemented.\n");
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exit (77);
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}
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printf ("FAIL: getcontext failed.\n");
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exit (1);
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}
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ctx.uc_stack.ss_sp = st1;
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ctx.uc_stack.ss_size = sizeof (st1);
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ctx.uc_link = 0;
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makecontext (&ctx, cf, 0);
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/* Without this check, a stub makecontext can make us spin forever. */
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if (memcmp (&tempctx, &ctx, sizeof ctx) == 0)
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{
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puts ("UNSUPPORTED: makecontext was a no-op, presuming not implemented");
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exit (77);
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}
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ret = setcontext (&ctx);
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if (ret != 0)
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{
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printf ("FAIL: setcontext returned with %d and errno of %d.\n", ret, errno);
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exit (1);
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}
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printf ("FAIL: Impossibly returned to main.\n");
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exit (1);
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}
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#include "../test-skeleton.c"
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