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/>.
29 #include "systemd/sd-journal.h"
34 static char *arg_identifier = NULL;
35 static int arg_priority = LOG_INFO;
36 static bool arg_level_prefix = true;
38 static void help(void) {
39 printf("%s [OPTIONS...] {COMMAND} ...\n\n"
40 "Execute process with stdout/stderr connected to the journal.\n\n"
41 " -h --help Show this help\n"
42 " --version Show package version\n"
43 " -t --identifier=STRING Set syslog identifier\n"
44 " -p --priority=PRIORITY Set priority value (0..7)\n"
45 " --level-prefix=BOOL Control whether level prefix shall be parsed\n"
46 , program_invocation_short_name);
49 static int parse_argv(int argc, char *argv[]) {
56 static const struct option options[] = {
57 { "help", no_argument, NULL, 'h' },
58 { "version", no_argument, NULL, ARG_VERSION },
59 { "identifier", required_argument, NULL, 't' },
60 { "priority", required_argument, NULL, 'p' },
61 { "level-prefix", required_argument, NULL, ARG_LEVEL_PREFIX },
70 while ((c = getopt_long(argc, argv, "+ht:p:", options, NULL)) >= 0)
80 puts(SYSTEMD_FEATURES);
86 arg_identifier = NULL;
88 arg_identifier = strdup(optarg);
95 arg_priority = log_level_from_string(optarg);
96 if (arg_priority < 0) {
97 log_error("Failed to parse priority value.");
102 case ARG_LEVEL_PREFIX: {
105 k = parse_boolean(optarg);
107 log_error("Failed to parse level prefix value.");
110 arg_level_prefix = k;
118 assert_not_reached("Unhandled option");
124 int main(int argc, char *argv[]) {
125 int r, fd = -1, saved_stderr = -1;
127 log_parse_environment();
130 r = parse_argv(argc, argv);
134 fd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix);
136 log_error_errno(fd, "Failed to create stream fd: %m");
141 saved_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3);
143 if (dup3(fd, STDOUT_FILENO, 0) < 0 ||
144 dup3(fd, STDERR_FILENO, 0) < 0) {
145 log_error_errno(errno, "Failed to duplicate fd: %m");
156 execl("/bin/cat", "/bin/cat", NULL);
158 execvp(argv[optind], argv + optind);
162 /* Let's try to restore a working stderr, so we can print the error message */
163 if (saved_stderr >= 0)
164 dup3(saved_stderr, STDERR_FILENO, 0);
166 log_error_errno(r, "Failed to execute process: %m");
170 safe_close(saved_stderr);
172 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;