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3b7124a8 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2011 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include <fcntl.h> | |
4871690d | 21 | #include <sys/socket.h> |
cf0fbc49 | 22 | #include <time.h> |
3b7124a8 | 23 | |
b5efdb8a | 24 | #include "alloc-util.h" |
6bedfcbb | 25 | #include "fd-util.h" |
ad79565d | 26 | #include "fileio.h" |
f97b34a6 | 27 | #include "format-util.h" |
afc5dbf3 | 28 | #include "io-util.h" |
6bedfcbb LP |
29 | #include "journald-console.h" |
30 | #include "journald-server.h" | |
31 | #include "parse-util.h" | |
0b452006 | 32 | #include "process-util.h" |
15a5e950 | 33 | #include "stdio-util.h" |
288a74cc | 34 | #include "terminal-util.h" |
3b7124a8 | 35 | |
ad79565d UTL |
36 | static bool prefix_timestamp(void) { |
37 | ||
38 | static int cached_printk_time = -1; | |
39 | ||
40 | if (_unlikely_(cached_printk_time < 0)) { | |
41 | _cleanup_free_ char *p = NULL; | |
42 | ||
43 | cached_printk_time = | |
44 | read_one_line_file("/sys/module/printk/parameters/time", &p) >= 0 | |
45 | && parse_boolean(p) > 0; | |
46 | } | |
47 | ||
48 | return cached_printk_time; | |
49 | } | |
50 | ||
3b7124a8 LP |
51 | void server_forward_console( |
52 | Server *s, | |
53 | int priority, | |
54 | const char *identifier, | |
55 | const char *message, | |
3b3154df | 56 | const struct ucred *ucred) { |
3b7124a8 | 57 | |
ad79565d | 58 | struct iovec iovec[5]; |
ad79565d | 59 | struct timespec ts; |
5ffa8c81 ZJS |
60 | char tbuf[sizeof("[] ")-1 + DECIMAL_STR_MAX(ts.tv_sec) + DECIMAL_STR_MAX(ts.tv_nsec)-3 + 1]; |
61 | char header_pid[sizeof("[]: ")-1 + DECIMAL_STR_MAX(pid_t)]; | |
3b7124a8 | 62 | int n = 0, fd; |
fb472900 | 63 | _cleanup_free_ char *ident_buf = NULL; |
3b7124a8 LP |
64 | const char *tty; |
65 | ||
66 | assert(s); | |
67 | assert(message); | |
68 | ||
69 | if (LOG_PRI(priority) > s->max_level_console) | |
70 | return; | |
71 | ||
ad79565d UTL |
72 | /* First: timestamp */ |
73 | if (prefix_timestamp()) { | |
74 | assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0); | |
5ffa8c81 | 75 | xsprintf(tbuf, "[%5"PRI_TIME".%06ld] ", |
de0671ee ZJS |
76 | ts.tv_sec, |
77 | ts.tv_nsec / 1000); | |
ad79565d UTL |
78 | IOVEC_SET_STRING(iovec[n++], tbuf); |
79 | } | |
80 | ||
81 | /* Second: identifier and PID */ | |
3b7124a8 LP |
82 | if (ucred) { |
83 | if (!identifier) { | |
84 | get_process_comm(ucred->pid, &ident_buf); | |
85 | identifier = ident_buf; | |
86 | } | |
87 | ||
5ffa8c81 | 88 | xsprintf(header_pid, "["PID_FMT"]: ", ucred->pid); |
3b7124a8 LP |
89 | |
90 | if (identifier) | |
91 | IOVEC_SET_STRING(iovec[n++], identifier); | |
92 | ||
93 | IOVEC_SET_STRING(iovec[n++], header_pid); | |
94 | } else if (identifier) { | |
95 | IOVEC_SET_STRING(iovec[n++], identifier); | |
96 | IOVEC_SET_STRING(iovec[n++], ": "); | |
97 | } | |
98 | ||
ad79565d | 99 | /* Fourth: message */ |
3b7124a8 LP |
100 | IOVEC_SET_STRING(iovec[n++], message); |
101 | IOVEC_SET_STRING(iovec[n++], "\n"); | |
102 | ||
103 | tty = s->tty_path ? s->tty_path : "/dev/console"; | |
104 | ||
8ae2c630 LP |
105 | /* Before you ask: yes, on purpose we open/close the console for each log line we write individually. This is a |
106 | * good strategy to avoid journald getting killed by the kernel's SAK concept (it doesn't fix this entirely, | |
107 | * but minimizes the time window the kernel might end up killing journald due to SAK). It also makes things | |
108 | * easier for us so that we don't have to recover from hangups and suchlike triggered on the console. */ | |
109 | ||
3b7124a8 LP |
110 | fd = open_terminal(tty, O_WRONLY|O_NOCTTY|O_CLOEXEC); |
111 | if (fd < 0) { | |
709f6e46 | 112 | log_debug_errno(fd, "Failed to open %s for logging: %m", tty); |
fb472900 | 113 | return; |
3b7124a8 LP |
114 | } |
115 | ||
116 | if (writev(fd, iovec, n) < 0) | |
56f64d95 | 117 | log_debug_errno(errno, "Failed to write to %s for logging: %m", tty); |
3b7124a8 | 118 | |
03e334a1 | 119 | safe_close(fd); |
3b7124a8 | 120 | } |