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