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git.ipfire.org Git - thirdparty/systemd.git/blob - src/journal/journald-console.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 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/>.
24 #include <sys/socket.h>
26 #include "alloc-util.h"
29 #include "formats-util.h"
31 #include "journald-console.h"
32 #include "journald-server.h"
33 #include "parse-util.h"
34 #include "process-util.h"
35 #include "stdio-util.h"
36 #include "terminal-util.h"
38 static bool prefix_timestamp(void) {
40 static int cached_printk_time
= -1;
42 if (_unlikely_(cached_printk_time
< 0)) {
43 _cleanup_free_
char *p
= NULL
;
46 read_one_line_file("/sys/module/printk/parameters/time", &p
) >= 0
47 && parse_boolean(p
) > 0;
50 return cached_printk_time
;
53 void server_forward_console(
56 const char *identifier
,
58 const struct ucred
*ucred
) {
60 struct iovec iovec
[5];
62 char tbuf
[sizeof("[] ")-1 + DECIMAL_STR_MAX(ts
.tv_sec
) + DECIMAL_STR_MAX(ts
.tv_nsec
)-3 + 1];
63 char header_pid
[sizeof("[]: ")-1 + DECIMAL_STR_MAX(pid_t
)];
65 _cleanup_free_
char *ident_buf
= NULL
;
71 if (LOG_PRI(priority
) > s
->max_level_console
)
74 /* First: timestamp */
75 if (prefix_timestamp()) {
76 assert_se(clock_gettime(CLOCK_MONOTONIC
, &ts
) == 0);
77 xsprintf(tbuf
, "[%5"PRI_TIME
".%06ld] ",
80 IOVEC_SET_STRING(iovec
[n
++], tbuf
);
83 /* Second: identifier and PID */
86 get_process_comm(ucred
->pid
, &ident_buf
);
87 identifier
= ident_buf
;
90 xsprintf(header_pid
, "["PID_FMT
"]: ", ucred
->pid
);
93 IOVEC_SET_STRING(iovec
[n
++], identifier
);
95 IOVEC_SET_STRING(iovec
[n
++], header_pid
);
96 } else if (identifier
) {
97 IOVEC_SET_STRING(iovec
[n
++], identifier
);
98 IOVEC_SET_STRING(iovec
[n
++], ": ");
101 /* Fourth: message */
102 IOVEC_SET_STRING(iovec
[n
++], message
);
103 IOVEC_SET_STRING(iovec
[n
++], "\n");
105 tty
= s
->tty_path
? s
->tty_path
: "/dev/console";
107 fd
= open_terminal(tty
, O_WRONLY
|O_NOCTTY
|O_CLOEXEC
);
109 log_debug_errno(fd
, "Failed to open %s for logging: %m", tty
);
113 if (writev(fd
, iovec
, n
) < 0)
114 log_debug_errno(errno
, "Failed to write to %s for logging: %m", tty
);