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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2012 Lennart Poettering
systemd 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.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdio.h>
#include <getopt.h>
#include <assert.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include "systemd/sd-journal.h"
#include "util.h"
#include "build.h"
static char *arg_identifier = NULL;
static int arg_priority = LOG_INFO;
static bool arg_level_prefix = true;
static int help(void) {
printf("%s [OPTIONS...] {COMMAND} ...\n\n"
"Execute process with stdout/stderr connected to the journal.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" -t --identifier=STRING Set syslog identifier\n"
" -p --priority=PRIORITY Set priority value (0..7)\n"
" --level-prefix=BOOL Control whether level prefix shall be parsed\n",
program_invocation_short_name);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_LEVEL_PREFIX
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "identifier", required_argument, NULL, 't' },
{ "priority", required_argument, NULL, 'p' },
{ "level-prefix", required_argument, NULL, ARG_LEVEL_PREFIX },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "+ht:p:", options, NULL)) >= 0) {
switch (c) {
case 'h':
return help();
case ARG_VERSION:
puts(PACKAGE_STRING);
puts(SYSTEMD_FEATURES);
return 0;
case 't':
free(arg_identifier);
if (isempty(optarg))
arg_identifier = NULL;
else {
arg_identifier = strdup(optarg);
if (!arg_identifier)
return log_oom();
}
break;
case 'p':
arg_priority = log_level_from_string(optarg);
if (arg_priority < 0) {
log_error("Failed to parse priority value.");
return arg_priority;
}
break;
case ARG_LEVEL_PREFIX: {
int k;
k = parse_boolean(optarg);
if (k < 0) {
log_error("Failed to parse level prefix value.");
return k;
}
arg_level_prefix = k;
break;
}
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
}
return 1;
}
int main(int argc, char *argv[]) {
int r, fd = -1, saved_stderr = -1;
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
fd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix);
if (fd < 0) {
log_error("Failed to create stream fd: %s", strerror(-fd));
r = fd;
goto finish;
}
saved_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3);
if (dup3(fd, STDOUT_FILENO, 0) < 0 ||
dup3(fd, STDERR_FILENO, 0) < 0) {
log_error("Failed to duplicate fd: %m");
r = -errno;
goto finish;
}
if (fd >= 3)
safe_close(fd);
fd = -1;
if (argc <= optind)
execl("/bin/cat", "/bin/cat", NULL);
else
execvp(argv[optind], argv + optind);
r = -errno;
/* Let's try to restore a working stderr, so we can print the error message */
if (saved_stderr >= 0)
dup3(saved_stderr, STDERR_FILENO, 0);
log_error("Failed to execute process: %s", strerror(-r));
finish:
safe_close(fd);
safe_close(saved_stderr);
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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