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/* Tests for monitoring file descriptor usage.
Copyright (C) 2018-2022 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; if not, see
<https://www.gnu.org/licenses/>. */
#include <fcntl.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <support/capture_subprocess.h>
#include <support/check.h>
#include <support/descriptors.h>
#include <support/support.h>
#include <support/xunistd.h>
/* This is the next free descriptor that the subprocess will pick. */
static int free_descriptor;
static void
subprocess_no_change (void *closure)
{
struct support_descriptors *descrs = support_descriptors_list ();
int fd = xopen ("/dev/null", O_WRONLY, 0);
TEST_COMPARE (fd, free_descriptor);
xclose (fd);
support_descriptors_free (descrs);
}
static void
subprocess_closed_descriptor (void *closure)
{
int fd = xopen ("/dev/null", O_WRONLY, 0);
TEST_COMPARE (fd, free_descriptor);
struct support_descriptors *descrs = support_descriptors_list ();
xclose (fd);
support_descriptors_check (descrs); /* Will report failure. */
puts ("EOT");
support_descriptors_free (descrs);
}
static void
subprocess_opened_descriptor (void *closure)
{
struct support_descriptors *descrs = support_descriptors_list ();
int fd = xopen ("/dev/null", O_WRONLY, 0);
TEST_COMPARE (fd, free_descriptor);
support_descriptors_check (descrs); /* Will report failure. */
puts ("EOT");
support_descriptors_free (descrs);
}
static void
subprocess_changed_descriptor (void *closure)
{
int fd = xopen ("/dev/null", O_WRONLY, 0);
TEST_COMPARE (fd, free_descriptor);
struct support_descriptors *descrs = support_descriptors_list ();
xclose (fd);
TEST_COMPARE (xopen ("/dev", O_DIRECTORY | O_RDONLY, 0), fd);
support_descriptors_check (descrs); /* Will report failure. */
puts ("EOT");
support_descriptors_free (descrs);
}
static void
report_subprocess_output (const char *name,
struct support_capture_subprocess *proc)
{
printf ("info: BEGIN %s output\n"
"%s"
"info: END %s output\n",
name, proc->out.buffer, name);
}
/* Use an explicit flag to preserve failure status across
support_record_failure_reset calls. */
static bool good = true;
static void
test_run (void)
{
struct support_capture_subprocess proc = support_capture_subprocess
(&subprocess_no_change, NULL);
support_capture_subprocess_check (&proc, "subprocess_no_change",
0, sc_allow_none);
support_capture_subprocess_free (&proc);
char *expected = xasprintf ("\nDifferences:\n"
"error: descriptor %d was closed\n"
"EOT\n",
free_descriptor);
good = good && !support_record_failure_is_failed ();
proc = support_capture_subprocess (&subprocess_closed_descriptor, NULL);
good = good && support_record_failure_is_failed ();
support_record_failure_reset (); /* Discard the reported error. */
report_subprocess_output ("subprocess_closed_descriptor", &proc);
TEST_VERIFY (strstr (proc.out.buffer, expected) != NULL);
support_capture_subprocess_check (&proc, "subprocess_closed_descriptor",
0, sc_allow_stdout);
support_capture_subprocess_free (&proc);
free (expected);
expected = xasprintf ("\nDifferences:\n"
"error: descriptor %d was opened (\"/dev/null\")\n"
"EOT\n",
free_descriptor);
good = good && !support_record_failure_is_failed ();
proc = support_capture_subprocess (&subprocess_opened_descriptor, NULL);
good = good && support_record_failure_is_failed ();
support_record_failure_reset (); /* Discard the reported error. */
report_subprocess_output ("subprocess_opened_descriptor", &proc);
TEST_VERIFY (strstr (proc.out.buffer, expected) != NULL);
support_capture_subprocess_check (&proc, "subprocess_opened_descriptor",
0, sc_allow_stdout);
support_capture_subprocess_free (&proc);
free (expected);
expected = xasprintf ("\nDifferences:\n"
"error: descriptor %d changed from \"/dev/null\""
" to \"/dev\"\n"
"error: descriptor %d changed ino ",
free_descriptor, free_descriptor);
good = good && !support_record_failure_is_failed ();
proc = support_capture_subprocess (&subprocess_changed_descriptor, NULL);
good = good && support_record_failure_is_failed ();
support_record_failure_reset (); /* Discard the reported error. */
report_subprocess_output ("subprocess_changed_descriptor", &proc);
TEST_VERIFY (strstr (proc.out.buffer, expected) != NULL);
support_capture_subprocess_check (&proc, "subprocess_changed_descriptor",
0, sc_allow_stdout);
support_capture_subprocess_free (&proc);
free (expected);
}
static int
do_test (void)
{
puts ("info: initial descriptor set");
{
struct support_descriptors *descrs = support_descriptors_list ();
support_descriptors_dump (descrs, "info: ", stdout);
support_descriptors_free (descrs);
}
free_descriptor = xopen ("/dev/null", O_WRONLY, 0);
puts ("info: descriptor set with additional free descriptor");
{
struct support_descriptors *descrs = support_descriptors_list ();
support_descriptors_dump (descrs, "info: ", stdout);
support_descriptors_free (descrs);
}
TEST_VERIFY (free_descriptor >= 3);
xclose (free_descriptor);
/* Initial test run without a sentinel descriptor. The presence of
such a descriptor exercises different conditions in the list
comparison in support_descriptors_check. */
test_run ();
/* Allocate a sentinel descriptor at the end of the descriptor list,
after free_descriptor. */
int sentinel_fd;
{
int fd = xopen ("/dev/full", O_WRONLY, 0);
TEST_COMPARE (fd, free_descriptor);
sentinel_fd = dup (fd);
TEST_VERIFY_EXIT (sentinel_fd > fd);
xclose (fd);
}
puts ("info: descriptor set with sentinel descriptor");
{
struct support_descriptors *descrs = support_descriptors_list ();
support_descriptors_dump (descrs, "info: ", stdout);
support_descriptors_free (descrs);
}
/* Second test run with sentinel descriptor. */
test_run ();
xclose (sentinel_fd);
return !good;
}
#include <support/test-driver.c>
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