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/**
* @file utime.c
*
* @author Thomas Jahns, Deutsches Klimarechenzentrum
*
* @section LICENSE
* Copyright 2012 - 2014
*
* Mathis Rosenhauer, Moritz Hanke, Joerg Behrens
* Deutsches Klimarechenzentrum GmbH
* Bundesstr. 45a
* 20146 Hamburg Germany
*
* Luis Kornblueh
* Max-Planck-Institut fuer Meteorologie
* Bundesstr. 53
* 20146 Hamburg
* Germany
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @section DESCRIPTION
*
* Simple timing command, since calling time(1) gives non-portable results.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <unistd.h>
static int
run_cmd(int argc, char *argv[]);
int main(int argc, char **argv)
{
struct timeval utime = { .tv_sec = 0, .tv_usec = 0 };
int status, rstatus;
if (argc > 1 && ((status = run_cmd(argc - 1, argv + 1)) >= 0))
{
struct rusage usage;
if ((rstatus = getrusage(RUSAGE_CHILDREN, &usage) == -1))
{
perror("resource usage statistics unavailable");
}
else if (rstatus != 0)
{
fputs("an unknown error occurred\n", stderr);
return EXIT_FAILURE;
}
else
{
utime = usage.ru_utime;
}
}
else if (status)
{
fputs("could not fork child\n", stderr);
return EXIT_FAILURE;
}
fprintf(stderr, "%f\n", (utime.tv_sec * 1000000 + utime.tv_usec)/1000000.0);
return status;
}
static int
run_cmd(int argc, char *argv[])
{
int status;
pid_t child_pid;
if (argc < 1)
return -1;
if ((child_pid = fork()) < 0)
status = -1;
else if (child_pid == 0)
{
/* child */
execvp(argv[0], argv);
_exit(127); /* execvp should not have returned */
}
else
{
while (waitpid(child_pid, &status, 0) < 0)
if (errno != EINTR)
{
status = -1;
break;
}
}
return status;
}
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