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 General Public License as published by
10 the Free Software Foundation; either version 2 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 General Public License for more details.
18 You should have received a copy of the GNU 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;