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/* Test concurrent fork, getline, and fflush (NULL).
Copyright (C) 2016-2021 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; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <pthread.h>
#include <stdbool.h>
#include <stdlib.h>
#include <malloc.h>
#include <time.h>
#include <string.h>
#include <signal.h>
#include <support/xthread.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
enum {
/* Number of threads which call fork. */
fork_thread_count = 4,
/* Number of threads which call getline (and, indirectly,
malloc). */
read_thread_count = 8,
};
static bool termination_requested;
static void *
fork_thread_function (void *closure)
{
while (!__atomic_load_n (&termination_requested, __ATOMIC_RELAXED))
{
pid_t pid = fork ();
if (pid < 0)
{
printf ("error: fork: %m\n");
abort ();
}
else if (pid == 0)
_exit (17);
int status;
if (waitpid (pid, &status, 0) < 0)
{
printf ("error: waitpid: %m\n");
abort ();
}
if (!WIFEXITED (status) || WEXITSTATUS (status) != 17)
{
printf ("error: waitpid returned invalid status: %d\n", status);
abort ();
}
}
return NULL;
}
static char *file_to_read;
static void *
read_thread_function (void *closure)
{
FILE *f = fopen (file_to_read, "r");
if (f == NULL)
{
printf ("error: fopen (%s): %m\n", file_to_read);
abort ();
}
while (!__atomic_load_n (&termination_requested, __ATOMIC_RELAXED))
{
rewind (f);
char *line = NULL;
size_t line_allocated = 0;
ssize_t ret = getline (&line, &line_allocated, f);
if (ret < 0)
{
printf ("error: getline: %m\n");
abort ();
}
free (line);
}
fclose (f);
return NULL;
}
static void *
flushall_thread_function (void *closure)
{
while (!__atomic_load_n (&termination_requested, __ATOMIC_RELAXED))
if (fflush (NULL) != 0)
{
printf ("error: fflush (NULL): %m\n");
abort ();
}
return NULL;
}
static void
create_threads (pthread_t *threads, size_t count, void *(*func) (void *))
{
for (size_t i = 0; i < count; ++i)
threads[i] = xpthread_create (NULL, func, NULL);
}
static void
join_threads (pthread_t *threads, size_t count)
{
for (size_t i = 0; i < count; ++i)
xpthread_join (threads[i]);
}
/* Create a file which consists of a single long line, and assigns
file_to_read. The hope is that this triggers an allocation in
getline which needs a lock. */
static void
create_file_with_large_line (void)
{
int fd = create_temp_file ("bug19431-large-line", &file_to_read);
if (fd < 0)
{
printf ("error: create_temp_file: %m\n");
abort ();
}
FILE *f = fdopen (fd, "w+");
if (f == NULL)
{
printf ("error: fdopen: %m\n");
abort ();
}
for (int i = 0; i < 50000; ++i)
fputc ('x', f);
fputc ('\n', f);
if (ferror (f))
{
printf ("error: fputc: %m\n");
abort ();
}
if (fclose (f) != 0)
{
printf ("error: fclose: %m\n");
abort ();
}
}
static int
do_test (void)
{
/* Make sure that we do not exceed the arena limit with the number
of threads we configured. */
if (mallopt (M_ARENA_MAX, 400) == 0)
{
printf ("error: mallopt (M_ARENA_MAX) failed\n");
return 1;
}
/* Leave some room for shutting down all threads gracefully. */
int timeout = 3;
if (timeout > DEFAULT_TIMEOUT)
timeout = DEFAULT_TIMEOUT - 1;
create_file_with_large_line ();
pthread_t fork_threads[fork_thread_count];
create_threads (fork_threads, fork_thread_count, fork_thread_function);
pthread_t read_threads[read_thread_count];
create_threads (read_threads, read_thread_count, read_thread_function);
pthread_t flushall_threads[1];
create_threads (flushall_threads, 1, flushall_thread_function);
struct timespec ts = {timeout, 0};
if (nanosleep (&ts, NULL))
{
printf ("error: error: nanosleep: %m\n");
abort ();
}
__atomic_store_n (&termination_requested, true, __ATOMIC_RELAXED);
join_threads (flushall_threads, 1);
join_threads (read_threads, read_thread_count);
join_threads (fork_threads, fork_thread_count);
free (file_to_read);
return 0;
}
#include <support/test-driver.c>
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