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20b6b8e8a5
With fortification enabled, read calls return result needs to be checked,
has it gets the __wur macro enabled.
Note on read call removal from sysdeps/pthread/tst-cancel20.c and
sysdeps/pthread/tst-cancel21.c:
It is assumed that this second read call was there to overcome the race
condition between pipe closure and thread cancellation that could happen
in the original code. Since this race condition got fixed by
d0e3ffb7a5 the second call seems
superfluous. Hence, instead of checking for the return value of read, it
looks reasonable to simply remove it.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
126 lines
2.4 KiB
C
126 lines
2.4 KiB
C
/* Copyright (C) 2003-2023 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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#include <errno.h>
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#include <pthread.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 <unistd.h>
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static pthread_barrier_t bar;
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static int fd[2];
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static void
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cleanup (void *arg)
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{
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static int ncall;
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if (++ncall != 1)
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{
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puts ("second call to cleanup");
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exit (1);
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}
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printf ("cleanup call #%d\n", ncall);
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}
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static void *
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tf (void *arg)
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{
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pthread_cleanup_push (cleanup, NULL);
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int e = pthread_barrier_wait (&bar);
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if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
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{
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puts ("tf: 1st barrier_wait failed");
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exit (1);
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}
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/* This call should block and be cancelable. */
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char buf[20];
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if (read (fd[0], buf, sizeof (buf)))
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{
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puts ("read unexpectedly returned");
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exit (1);
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}
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pthread_cleanup_pop (0);
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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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pthread_t th;
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if (pthread_barrier_init (&bar, NULL, 2) != 0)
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{
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puts ("barrier_init failed");
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exit (1);
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}
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if (pipe (fd) != 0)
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{
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puts ("pipe failed");
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exit (1);
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}
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if (pthread_create (&th, NULL, tf, NULL) != 0)
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{
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puts ("create failed");
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exit (1);
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}
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int e = pthread_barrier_wait (&bar);
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if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
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{
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puts ("1st barrier_wait failed");
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exit (1);
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}
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if (pthread_cancel (th) != 0)
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{
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puts ("1st cancel failed");
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exit (1);
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}
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void *r;
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if (pthread_join (th, &r) != 0)
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{
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puts ("join failed");
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exit (1);
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}
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if (r != PTHREAD_CANCELED)
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{
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puts ("thread not canceled");
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exit (1);
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}
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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