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* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
189 lines
5.9 KiB
C
189 lines
5.9 KiB
C
/* Test capturing output from a subprocess.
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Copyright (C) 2017-2018 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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<http://www.gnu.org/licenses/>. */
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#include <stdbool.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/capture_subprocess.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <sys/wait.h>
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#include <unistd.h>
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/* Write one byte at *P to FD and advance *P. Do nothing if *P is
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'\0'. */
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static void
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transfer (const unsigned char **p, int fd)
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{
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if (**p != '\0')
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{
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TEST_VERIFY (write (fd, *p, 1) == 1);
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++*p;
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}
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}
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/* Determine the order in which stdout and stderr are written. */
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enum write_mode { out_first, err_first, interleave,
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write_mode_last = interleave };
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/* Describe what to write in the subprocess. */
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struct test
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{
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char *out;
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char *err;
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enum write_mode write_mode;
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int signal;
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int status;
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};
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/* For use with support_capture_subprocess. */
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static void
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callback (void *closure)
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{
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const struct test *test = closure;
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bool mode_ok = false;
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switch (test->write_mode)
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{
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case out_first:
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TEST_VERIFY (fputs (test->out, stdout) >= 0);
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TEST_VERIFY (fflush (stdout) == 0);
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TEST_VERIFY (fputs (test->err, stderr) >= 0);
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TEST_VERIFY (fflush (stderr) == 0);
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mode_ok = true;
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break;
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case err_first:
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TEST_VERIFY (fputs (test->err, stderr) >= 0);
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TEST_VERIFY (fflush (stderr) == 0);
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TEST_VERIFY (fputs (test->out, stdout) >= 0);
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TEST_VERIFY (fflush (stdout) == 0);
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mode_ok = true;
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break;
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case interleave:
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{
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const unsigned char *pout = (const unsigned char *) test->out;
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const unsigned char *perr = (const unsigned char *) test->err;
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do
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{
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transfer (&pout, STDOUT_FILENO);
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transfer (&perr, STDERR_FILENO);
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}
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while (*pout != '\0' || *perr != '\0');
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}
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mode_ok = true;
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break;
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}
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TEST_VERIFY (mode_ok);
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if (test->signal != 0)
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raise (test->signal);
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exit (test->status);
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}
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/* Create a heap-allocated random string of letters. */
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static char *
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random_string (size_t length)
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{
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char *result = xmalloc (length + 1);
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for (size_t i = 0; i < length; ++i)
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result[i] = 'a' + (rand () % 26);
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result[length] = '\0';
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return result;
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}
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/* Check that the specific stream from the captured subprocess matches
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expectations. */
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static void
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check_stream (const char *what, const struct xmemstream *stream,
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const char *expected)
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{
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if (strcmp (stream->buffer, expected) != 0)
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{
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support_record_failure ();
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printf ("error: captured %s data incorrect\n"
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" expected: %s\n"
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" actual: %s\n",
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what, expected, stream->buffer);
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}
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if (stream->length != strlen (expected))
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{
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support_record_failure ();
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printf ("error: captured %s data length incorrect\n"
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" expected: %zu\n"
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" actual: %zu\n",
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what, strlen (expected), stream->length);
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}
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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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const int lengths[] = {0, 1, 17, 512, 20000, -1};
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/* Test multiple combinations of support_capture_subprocess.
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length_idx_stdout: Index into the lengths array above,
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controls how many bytes are written by the subprocess to
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standard output.
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length_idx_stderr: Same for standard error.
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write_mode: How standard output and standard error writes are
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ordered.
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signal: Exit with no signal if zero, with SIGTERM if one.
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status: Process exit status: 0 if zero, 3 if one. */
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for (int length_idx_stdout = 0; lengths[length_idx_stdout] >= 0;
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++length_idx_stdout)
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for (int length_idx_stderr = 0; lengths[length_idx_stderr] >= 0;
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++length_idx_stderr)
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for (int write_mode = 0; write_mode < write_mode_last; ++write_mode)
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for (int signal = 0; signal < 2; ++signal)
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for (int status = 0; status < 2; ++status)
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{
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struct test test =
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{
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.out = random_string (lengths[length_idx_stdout]),
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.err = random_string (lengths[length_idx_stderr]),
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.write_mode = write_mode,
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.signal = signal * SIGTERM, /* 0 or SIGTERM. */
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.status = status * 3, /* 0 or 3. */
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};
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TEST_VERIFY (strlen (test.out) == lengths[length_idx_stdout]);
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TEST_VERIFY (strlen (test.err) == lengths[length_idx_stderr]);
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struct support_capture_subprocess result
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= support_capture_subprocess (callback, &test);
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check_stream ("stdout", &result.out, test.out);
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check_stream ("stderr", &result.err, test.err);
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if (test.signal != 0)
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{
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TEST_VERIFY (WIFSIGNALED (result.status));
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TEST_VERIFY (WTERMSIG (result.status) == test.signal);
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}
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else
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{
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TEST_VERIFY (WIFEXITED (result.status));
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TEST_VERIFY (WEXITSTATUS (result.status) == test.status);
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}
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support_capture_subprocess_free (&result);
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free (test.out);
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free (test.err);
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}
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return 0;
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}
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#include <support/test-driver.c>
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