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) {
85 puts(SYSTEMD_FEATURES);
91 arg_identifier = NULL;
93 arg_identifier = strdup(optarg);
94 if (!arg_identifier) {
95 log_error("Out of memory.");
102 arg_priority = log_level_from_string(optarg);
103 if (arg_priority < 0) {
104 log_error("Failed to parse priority value.");
109 case ARG_LEVEL_PREFIX: {
112 k = parse_boolean(optarg);
114 log_error("Failed to parse level prefix value.");
117 arg_level_prefix = k;
122 log_error("Unknown option code %c", c);
130 int main(int argc, char *argv[]) {
131 int r, fd = -1, saved_stderr = -1;
133 log_parse_environment();
136 r = parse_argv(argc, argv);
140 fd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix);
142 log_error("Failed to create stream fd: %s", strerror(-fd));
147 saved_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3);
149 if (dup3(fd, STDOUT_FILENO, 0) < 0 ||
150 dup3(fd, STDERR_FILENO, 0) < 0) {
151 log_error("Failed to duplicate fd: %m");
157 close_nointr_nofail(fd);
162 execl("/bin/cat", "/bin/cat", NULL);
164 execvp(argv[optind], argv + optind);
168 /* Let's try to restore a working stderr, so we can print the error message */
169 if (saved_stderr >= 0)
170 dup3(saved_stderr, STDERR_FILENO, 0);
172 log_error("Failed to execute process: %s", strerror(-r));
176 close_nointr_nofail(fd);
178 if (saved_stderr >= 0)
179 close_nointr_nofail(saved_stderr);
181 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;