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/*
* Utility functions for tests that use subprocesses.
*
* Provides utility functions for subprocess manipulation. Specifically,
* provides a function, run_setup, which runs a command and bails if it fails,
* using its error message as the bail output, and is_function_output, which
* runs a function in a subprocess and checks its output and exit status
* against expected values.
*
* The canonical version of this file is maintained in the rra-c-util package,
* which can be found at <http://www.eyrie.org/~eagle/software/rra-c-util/>.
*
* Written by Russ Allbery <eagle@eyrie.org>
* Copyright 2002, 2004, 2005 Russ Allbery <eagle@eyrie.org>
* Copyright 2009, 2010, 2011
* The Board of Trustees of the Leland Stanford Junior University
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <config.h>
#include <portable/system.h>
#include <sys/wait.h>
#include <tests/tap/basic.h>
#include <tests/tap/process.h>
#include <tests/tap/string.h>
/*
* Given a function, an expected exit status, and expected output, runs that
* function in a subprocess, capturing stdout and stderr via a pipe, and
* returns the function output in newly allocated memory. Also captures the
* process exit status.
*/
static void
run_child_function(test_function_type function, void *data, int *status,
char **output)
{
int fds[2];
pid_t child;
char *buf;
ssize_t count, ret, buflen;
int rval;
/* Flush stdout before we start to avoid odd forking issues. */
fflush(stdout);
/* Set up the pipe and call the function, collecting its output. */
if (pipe(fds) == -1)
sysbail("can't create pipe");
child = fork();
if (child == (pid_t) -1) {
sysbail("can't fork");
} else if (child == 0) {
/* In child. Set up our stdout and stderr. */
close(fds[0]);
if (dup2(fds[1], 1) == -1)
_exit(255);
if (dup2(fds[1], 2) == -1)
_exit(255);
/* Now, run the function and exit successfully if it returns. */
(*function)(data);
fflush(stdout);
_exit(0);
} else {
/*
* In the parent; close the extra file descriptor, read the output if
* any, and then collect the exit status.
*/
close(fds[1]);
buflen = BUFSIZ;
buf = bmalloc(buflen);
count = 0;
do {
ret = read(fds[0], buf + count, buflen - count - 1);
if (ret > 0)
count += ret;
if (count >= buflen - 1) {
buflen += BUFSIZ;
buf = brealloc(buf, buflen);
}
} while (ret > 0);
buf[count < 0 ? 0 : count] = '\0';
if (waitpid(child, &rval, 0) == (pid_t) -1)
sysbail("waitpid failed");
close(fds[0]);
}
/* Store the output and return. */
*status = rval;
*output = buf;
}
/*
* Given a function, data to pass to that function, an expected exit status,
* and expected output, runs that function in a subprocess, capturing stdout
* and stderr via a pipe, and compare the combination of stdout and stderr
* with the expected output and the exit status with the expected status.
* Expects the function to always exit (not die from a signal).
*/
void
is_function_output(test_function_type function, void *data, int status,
const char *output, const char *format, ...)
{
char *buf, *msg;
int rval;
va_list args;
run_child_function(function, data, &rval, &buf);
/* Now, check the results against what we expected. */
va_start(args, format);
bvasprintf(&msg, format, args);
va_end(args);
ok(WIFEXITED(rval), "%s (exited)", msg);
is_int(status, WEXITSTATUS(rval), "%s (status)", msg);
is_string(output, buf, "%s (output)", msg);
free(buf);
free(msg);
}
/*
* A helper function for run_setup. This is a function to run an external
* command, suitable for passing into run_child_function. The expected
* argument must be an argv array, with argv[0] being the command to run.
*/
static void
exec_command(void *data)
{
char *const *argv = data;
execvp(argv[0], argv);
}
/*
* Given a command expressed as an argv struct, with argv[0] the name or path
* to the command, run that command. If it exits with a non-zero status, use
* the part of its output up to the first newline as the error message when
* calling bail.
*/
void
run_setup(const char *const argv[])
{
char *output, *p;
int status;
run_child_function(exec_command, (void *) argv, &status, &output);
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
p = strchr(output, '\n');
if (p != NULL)
*p = '\0';
bail("%s", output);
}
free(output);
}
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