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101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
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/* Verify side-effects of cancellable syscalls (BZ #12683).
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Copyright (C) 2023 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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/* This testcase checks if there is resource leakage if the syscall has
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returned from kernelspace, but before userspace saves the return
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value. The 'leaker' thread should be able to close the file descriptor
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if the resource is already allocated, meaning that if the cancellation
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signal arrives *after* the open syscal return from kernel, the
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side-effect should be visible to application. */
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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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#include <unistd.h>
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#include <stdlib.h>
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#include <support/xunistd.h>
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#include <support/xthread.h>
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#include <support/check.h>
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#include <support/temp_file.h>
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#include <support/support.h>
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#include <support/descriptors.h>
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static void *
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writeopener (void *arg)
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{
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int fd;
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for (;;)
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{
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fd = open (arg, O_WRONLY);
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xclose (fd);
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}
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return NULL;
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}
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static void *
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leaker (void *arg)
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{
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int fd = open (arg, O_RDONLY);
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TEST_VERIFY_EXIT (fd > 0);
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pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, 0);
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xclose (fd);
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return NULL;
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}
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static int
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do_test (void)
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{
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enum {
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iter_count = 1000
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};
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char *dir = support_create_temp_directory ("tst-cancel28");
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char *name = xasprintf ("%s/fifo", dir);
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TEST_COMPARE (mkfifo (name, 0600), 0);
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add_temp_file (name);
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struct support_descriptors *descrs = support_descriptors_list ();
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srand (1);
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xpthread_create (NULL, writeopener, name);
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for (int i = 0; i < iter_count; i++)
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{
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pthread_t td = xpthread_create (NULL, leaker, name);
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struct timespec ts =
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{ .tv_nsec = rand () % 100000, .tv_sec = 0 };
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nanosleep (&ts, NULL);
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/* Ignore pthread_cancel result because it might be the
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case when pthread_cancel is called when thread is already
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exited. */
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pthread_cancel (td);
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xpthread_join (td);
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}
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support_descriptors_check (descrs);
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support_descriptors_free (descrs);
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free (name);
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return 0;
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}
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#include <support/test-driver.c>
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