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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
3b7124a8 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2011 Lennart Poettering | |
3b7124a8 LP |
6 | ***/ |
7 | ||
8 | #include <fcntl.h> | |
4871690d | 9 | #include <sys/socket.h> |
cf0fbc49 | 10 | #include <time.h> |
3b7124a8 | 11 | |
b5efdb8a | 12 | #include "alloc-util.h" |
6bedfcbb | 13 | #include "fd-util.h" |
ad79565d | 14 | #include "fileio.h" |
f97b34a6 | 15 | #include "format-util.h" |
afc5dbf3 | 16 | #include "io-util.h" |
6bedfcbb LP |
17 | #include "journald-console.h" |
18 | #include "journald-server.h" | |
19 | #include "parse-util.h" | |
0b452006 | 20 | #include "process-util.h" |
15a5e950 | 21 | #include "stdio-util.h" |
288a74cc | 22 | #include "terminal-util.h" |
3b7124a8 | 23 | |
ad79565d UTL |
24 | static bool prefix_timestamp(void) { |
25 | ||
26 | static int cached_printk_time = -1; | |
27 | ||
28 | if (_unlikely_(cached_printk_time < 0)) { | |
29 | _cleanup_free_ char *p = NULL; | |
30 | ||
31 | cached_printk_time = | |
32 | read_one_line_file("/sys/module/printk/parameters/time", &p) >= 0 | |
33 | && parse_boolean(p) > 0; | |
34 | } | |
35 | ||
36 | return cached_printk_time; | |
37 | } | |
38 | ||
3b7124a8 LP |
39 | void server_forward_console( |
40 | Server *s, | |
41 | int priority, | |
42 | const char *identifier, | |
43 | const char *message, | |
3b3154df | 44 | const struct ucred *ucred) { |
3b7124a8 | 45 | |
ad79565d | 46 | struct iovec iovec[5]; |
ad79565d | 47 | struct timespec ts; |
fbd0b64f LP |
48 | char tbuf[STRLEN("[] ") + DECIMAL_STR_MAX(ts.tv_sec) + DECIMAL_STR_MAX(ts.tv_nsec)-3 + 1]; |
49 | char header_pid[STRLEN("[]: ") + DECIMAL_STR_MAX(pid_t)]; | |
fb472900 | 50 | _cleanup_free_ char *ident_buf = NULL; |
e6a7ec4b | 51 | _cleanup_close_ int fd = -1; |
3b7124a8 | 52 | const char *tty; |
e6a7ec4b | 53 | int n = 0; |
3b7124a8 LP |
54 | |
55 | assert(s); | |
56 | assert(message); | |
57 | ||
58 | if (LOG_PRI(priority) > s->max_level_console) | |
59 | return; | |
60 | ||
ad79565d UTL |
61 | /* First: timestamp */ |
62 | if (prefix_timestamp()) { | |
63 | assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0); | |
b123d975 | 64 | xsprintf(tbuf, "[%5"PRI_TIME".%06"PRI_NSEC"] ", |
de0671ee | 65 | ts.tv_sec, |
b123d975 | 66 | (nsec_t)ts.tv_nsec / 1000); |
e6a7ec4b LP |
67 | |
68 | iovec[n++] = IOVEC_MAKE_STRING(tbuf); | |
ad79565d UTL |
69 | } |
70 | ||
71 | /* Second: identifier and PID */ | |
3b7124a8 LP |
72 | if (ucred) { |
73 | if (!identifier) { | |
74 | get_process_comm(ucred->pid, &ident_buf); | |
75 | identifier = ident_buf; | |
76 | } | |
77 | ||
5ffa8c81 | 78 | xsprintf(header_pid, "["PID_FMT"]: ", ucred->pid); |
3b7124a8 LP |
79 | |
80 | if (identifier) | |
e6a7ec4b | 81 | iovec[n++] = IOVEC_MAKE_STRING(identifier); |
3b7124a8 | 82 | |
e6a7ec4b | 83 | iovec[n++] = IOVEC_MAKE_STRING(header_pid); |
3b7124a8 | 84 | } else if (identifier) { |
e6a7ec4b LP |
85 | iovec[n++] = IOVEC_MAKE_STRING(identifier); |
86 | iovec[n++] = IOVEC_MAKE_STRING(": "); | |
3b7124a8 LP |
87 | } |
88 | ||
ad79565d | 89 | /* Fourth: message */ |
e6a7ec4b LP |
90 | iovec[n++] = IOVEC_MAKE_STRING(message); |
91 | iovec[n++] = IOVEC_MAKE_STRING("\n"); | |
3b7124a8 | 92 | |
e6a7ec4b | 93 | tty = s->tty_path ?: "/dev/console"; |
3b7124a8 | 94 | |
8ae2c630 LP |
95 | /* Before you ask: yes, on purpose we open/close the console for each log line we write individually. This is a |
96 | * good strategy to avoid journald getting killed by the kernel's SAK concept (it doesn't fix this entirely, | |
97 | * but minimizes the time window the kernel might end up killing journald due to SAK). It also makes things | |
98 | * easier for us so that we don't have to recover from hangups and suchlike triggered on the console. */ | |
99 | ||
3b7124a8 LP |
100 | fd = open_terminal(tty, O_WRONLY|O_NOCTTY|O_CLOEXEC); |
101 | if (fd < 0) { | |
709f6e46 | 102 | log_debug_errno(fd, "Failed to open %s for logging: %m", tty); |
fb472900 | 103 | return; |
3b7124a8 LP |
104 | } |
105 | ||
106 | if (writev(fd, iovec, n) < 0) | |
56f64d95 | 107 | log_debug_errno(errno, "Failed to write to %s for logging: %m", tty); |
3b7124a8 | 108 | } |