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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2012 Lennart Poettering | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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/>. | |
20 | ***/ | |
21 | ||
22 | #include <stdio.h> | |
23 | #include <getopt.h> | |
24 | #include <assert.h> | |
25 | #include <unistd.h> | |
26 | #include <stdlib.h> | |
27 | #include <errno.h> | |
28 | #include <sys/fcntl.h> | |
29 | ||
30 | #include <systemd/sd-journal.h> | |
31 | ||
32 | #include "util.h" | |
33 | #include "build.h" | |
34 | ||
35 | static char *arg_identifier = NULL; | |
36 | static char arg_priority = LOG_INFO; | |
37 | static bool arg_level_prefix = true; | |
38 | ||
39 | static int help(void) { | |
40 | ||
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); | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
53 | static int parse_argv(int argc, char *argv[]) { | |
54 | ||
55 | enum { | |
56 | ARG_VERSION = 0x100, | |
57 | ARG_LEVEL_PREFIX | |
58 | }; | |
59 | ||
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 }, | |
66 | { NULL, 0, NULL, 0 } | |
67 | }; | |
68 | ||
69 | int c; | |
70 | ||
71 | assert(argc >= 0); | |
72 | assert(argv); | |
73 | ||
74 | while ((c = getopt_long(argc, argv, "+ht:p:", options, NULL)) >= 0) { | |
75 | ||
76 | switch (c) { | |
77 | ||
78 | case 'h': | |
79 | help(); | |
80 | return 0; | |
81 | ||
82 | case ARG_VERSION: | |
83 | puts(PACKAGE_STRING); | |
84 | puts(DISTRIBUTION); | |
85 | puts(SYSTEMD_FEATURES); | |
86 | return 0; | |
87 | ||
88 | case 't': | |
89 | free(arg_identifier); | |
90 | if (isempty(optarg)) | |
91 | arg_identifier = NULL; | |
92 | else { | |
93 | arg_identifier = strdup(optarg); | |
94 | if (!arg_identifier) { | |
95 | log_error("Out of memory."); | |
96 | return -ENOMEM; | |
97 | } | |
98 | } | |
99 | break; | |
100 | ||
101 | case 'p': | |
102 | arg_priority = log_level_from_string(optarg); | |
103 | if (arg_priority < 0) { | |
104 | log_error("Failed to parse priority value."); | |
105 | return arg_priority; | |
106 | } | |
107 | break; | |
108 | ||
109 | case ARG_LEVEL_PREFIX: { | |
110 | int k; | |
111 | ||
112 | k = parse_boolean(optarg); | |
113 | if (k < 0) { | |
114 | log_error("Failed to parse level prefix value."); | |
115 | return k; | |
116 | } | |
117 | arg_level_prefix = k; | |
118 | break; | |
119 | } | |
120 | ||
121 | default: | |
122 | log_error("Unknown option code %c", c); | |
123 | return -EINVAL; | |
124 | } | |
125 | } | |
126 | ||
127 | return 1; | |
128 | } | |
129 | ||
130 | int main(int argc, char *argv[]) { | |
131 | int r, fd = -1, saved_stderr = -1; | |
132 | ||
133 | log_parse_environment(); | |
134 | log_open(); | |
135 | ||
136 | r = parse_argv(argc, argv); | |
137 | if (r <= 0) | |
138 | goto finish; | |
139 | ||
140 | fd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix); | |
141 | if (fd < 0) { | |
142 | log_error("Failed to create stream fd: %s", strerror(fd)); | |
143 | r = fd; | |
144 | goto finish; | |
145 | } | |
146 | ||
147 | saved_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3); | |
148 | ||
149 | if (dup3(fd, STDOUT_FILENO, 0) < 0 || | |
150 | dup3(fd, STDERR_FILENO, 0) < 0) { | |
151 | log_error("Failed to duplicate fd: %s", strerror(fd)); | |
152 | r = -errno; | |
153 | goto finish; | |
154 | } | |
155 | ||
156 | if (fd >= 3) | |
157 | close_nointr_nofail(fd); | |
158 | ||
159 | fd = -1; | |
160 | ||
161 | if (argc <= optind) | |
162 | execl("/bin/cat", "/bin/cat", NULL); | |
163 | else | |
164 | execvp(argv[optind], argv + optind); | |
165 | ||
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); | |
169 | ||
170 | log_error("Failed to execute process: %m"); | |
171 | r = -errno; | |
172 | ||
173 | finish: | |
174 | if (fd >= 0) | |
175 | close_nointr_nofail(fd); | |
176 | ||
177 | if (saved_stderr >= 0) | |
178 | close_nointr_nofail(saved_stderr); | |
179 | ||
180 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
181 | } |