1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2012 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
28 #include <sys/fcntl.h>
30 #include <systemd/sd-journal.h>
35 static char *arg_identifier = NULL;
36 static int arg_priority = LOG_INFO;
37 static bool arg_level_prefix = true;
39 static int help(void) {
41 printf("%s [OPTIONS...] {COMMAND} ...\n\n"
42 "Execute process with stdout/stderr connected to the journal.\n\n"
43 " -h --help Show this help\n"
44 " --version Show package version\n"
45 " -t --identifier=STRING Set syslog identifier\n"
46 " -p --priority=PRIORITY Set priority value (0..7)\n"
47 " --level-prefix=BOOL Control whether level prefix shall be parsed\n",
48 program_invocation_short_name);
53 static int parse_argv(int argc, char *argv[]) {
60 static const struct option options[] = {
61 { "help", no_argument, NULL, 'h' },
62 { "version", no_argument, NULL, ARG_VERSION },
63 { "identifier", required_argument, NULL, 't' },
64 { "priority", required_argument, NULL, 'p' },
65 { "level-prefix", required_argument, NULL, ARG_LEVEL_PREFIX },
74 while ((c = getopt_long(argc, argv, "+ht:p:", options, NULL)) >= 0) {
84 puts(SYSTEMD_FEATURES);
90 arg_identifier = NULL;
92 arg_identifier = strdup(optarg);
99 arg_priority = log_level_from_string(optarg);
100 if (arg_priority < 0) {
101 log_error("Failed to parse priority value.");
106 case ARG_LEVEL_PREFIX: {
109 k = parse_boolean(optarg);
111 log_error("Failed to parse level prefix value.");
114 arg_level_prefix = k;
119 log_error("Unknown option code %c", c);
127 int main(int argc, char *argv[]) {
128 int r, fd = -1, saved_stderr = -1;
130 log_parse_environment();
133 r = parse_argv(argc, argv);
137 fd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix);
139 log_error("Failed to create stream fd: %s", strerror(-fd));
144 saved_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3);
146 if (dup3(fd, STDOUT_FILENO, 0) < 0 ||
147 dup3(fd, STDERR_FILENO, 0) < 0) {
148 log_error("Failed to duplicate fd: %m");
154 close_nointr_nofail(fd);
159 execl("/bin/cat", "/bin/cat", NULL);
161 execvp(argv[optind], argv + optind);
165 /* Let's try to restore a working stderr, so we can print the error message */
166 if (saved_stderr >= 0)
167 dup3(saved_stderr, STDERR_FILENO, 0);
169 log_error("Failed to execute process: %s", strerror(-r));
173 close_nointr_nofail(fd);
175 if (saved_stderr >= 0)
176 close_nointr_nofail(saved_stderr);
178 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;