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/>.
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) {
83 puts(SYSTEMD_FEATURES);
89 arg_identifier = NULL;
91 arg_identifier = strdup(optarg);
98 arg_priority = log_level_from_string(optarg);
99 if (arg_priority < 0) {
100 log_error("Failed to parse priority value.");
105 case ARG_LEVEL_PREFIX: {
108 k = parse_boolean(optarg);
110 log_error("Failed to parse level prefix value.");
113 arg_level_prefix = k;
121 assert_not_reached("Unhandled option");
128 int main(int argc, char *argv[]) {
129 int r, fd = -1, saved_stderr = -1;
131 log_parse_environment();
134 r = parse_argv(argc, argv);
138 fd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix);
140 log_error("Failed to create stream fd: %s", strerror(-fd));
145 saved_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3);
147 if (dup3(fd, STDOUT_FILENO, 0) < 0 ||
148 dup3(fd, STDERR_FILENO, 0) < 0) {
149 log_error("Failed to duplicate fd: %m");
160 execl("/bin/cat", "/bin/cat", NULL);
162 execvp(argv[optind], argv + optind);
166 /* Let's try to restore a working stderr, so we can print the error message */
167 if (saved_stderr >= 0)
168 dup3(saved_stderr, STDERR_FILENO, 0);
170 log_error("Failed to execute process: %s", strerror(-r));
174 safe_close(saved_stderr);
176 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;