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95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
/* Test getenv from a signal handler interrupting environment updates.
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Copyright (C) 2024-2025 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 <array_length.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 <support/check.h>
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#include <support/support.h>
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#include <support/xthread.h>
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#include <support/xsignal.h>
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/* Set to false by the main thread after doing all the setenv
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calls. */
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static bool running = true;
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/* Used to synchronize the start of signal sending. */
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static pthread_barrier_t barrier;
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/* Identity of the main thread. */
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static pthread_t main_thread;
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/* Send SIGUSR1 signals to main_thread. */
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static void *
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signal_thread (void *ignored)
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{
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xpthread_barrier_wait (&barrier);
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while (__atomic_load_n (&running, __ATOMIC_RELAXED))
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xpthread_kill (main_thread, SIGUSR1);
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return NULL;
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}
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/* Call getenv from a signal handler. */
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static void
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signal_handler (int signo)
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{
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TEST_COMPARE_STRING (getenv ("unset_variable"), NULL);
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char *value = getenv ("set_variable");
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TEST_VERIFY (strncmp (value, "value", strlen ("value")) == 0);
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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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/* Added to the environment using putenv. */
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char *variables[30];
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for (int i = 0; i < array_length (variables); ++i)
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variables[i] = xasprintf ("v%d=%d", i, i);
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xsignal (SIGUSR1, signal_handler);
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TEST_COMPARE (setenv ("set_variable", "value", 1), 0);
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xraise (SIGUSR1);
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main_thread = pthread_self ();
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xpthread_barrier_init (&barrier, NULL, 2);
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pthread_t thr = xpthread_create (NULL, signal_thread, NULL);
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xpthread_barrier_wait (&barrier);
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for (int i = 0; i < array_length (variables); ++i)
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{
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char buf[30];
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TEST_COMPARE (setenv ("temporary_variable", "1", 1), 0);
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snprintf (buf, sizeof (buf), "V%d", i);
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TEST_COMPARE (setenv (buf, buf + 1, 1), 0);
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TEST_COMPARE (putenv (variables[i]), 0);
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snprintf (buf, sizeof (buf), "value%d", i);
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TEST_COMPARE (setenv ("set_variable", buf, 1), 0);
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TEST_COMPARE (unsetenv ("temporary_variable"), 0);
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}
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__atomic_store_n (&running, false, __ATOMIC_RELAXED);
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xpthread_join (thr);
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xpthread_barrier_destroy (&barrier);
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for (int i = 0; i < array_length (variables); ++i)
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free (variables[i]);
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return 0;
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}
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#include <support/test-driver.c>
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