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/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <fcntl.h>
#include <sys/socket.h>
#include <time.h>
#include "alloc-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "format-util.h"
#include "io-util.h"
#include "journald-console.h"
#include "journald-server.h"
#include "parse-util.h"
#include "process-util.h"
#include "stdio-util.h"
#include "terminal-util.h"
static bool prefix_timestamp(void) {
static int cached_printk_time = -1;
if (_unlikely_(cached_printk_time < 0)) {
_cleanup_free_ char *p = NULL;
cached_printk_time =
read_one_line_file("/sys/module/printk/parameters/time", &p) >= 0
&& parse_boolean(p) > 0;
}
return cached_printk_time;
}
void server_forward_console(
Server *s,
int priority,
const char *identifier,
const char *message,
const struct ucred *ucred) {
struct iovec iovec[5];
struct timespec ts;
char tbuf[sizeof("[] ")-1 + DECIMAL_STR_MAX(ts.tv_sec) + DECIMAL_STR_MAX(ts.tv_nsec)-3 + 1];
char header_pid[sizeof("[]: ")-1 + DECIMAL_STR_MAX(pid_t)];
_cleanup_free_ char *ident_buf = NULL;
_cleanup_close_ int fd = -1;
const char *tty;
int n = 0;
assert(s);
assert(message);
if (LOG_PRI(priority) > s->max_level_console)
return;
/* First: timestamp */
if (prefix_timestamp()) {
assert_se(clock_gettime(CLOCK_MONOTONIC, &ts) == 0);
xsprintf(tbuf, "[%5"PRI_TIME".%06"PRI_NSEC"] ",
ts.tv_sec,
(nsec_t)ts.tv_nsec / 1000);
iovec[n++] = IOVEC_MAKE_STRING(tbuf);
}
/* Second: identifier and PID */
if (ucred) {
if (!identifier) {
get_process_comm(ucred->pid, &ident_buf);
identifier = ident_buf;
}
xsprintf(header_pid, "["PID_FMT"]: ", ucred->pid);
if (identifier)
iovec[n++] = IOVEC_MAKE_STRING(identifier);
iovec[n++] = IOVEC_MAKE_STRING(header_pid);
} else if (identifier) {
iovec[n++] = IOVEC_MAKE_STRING(identifier);
iovec[n++] = IOVEC_MAKE_STRING(": ");
}
/* Fourth: message */
iovec[n++] = IOVEC_MAKE_STRING(message);
iovec[n++] = IOVEC_MAKE_STRING("\n");
tty = s->tty_path ?: "/dev/console";
/* Before you ask: yes, on purpose we open/close the console for each log line we write individually. This is a
* good strategy to avoid journald getting killed by the kernel's SAK concept (it doesn't fix this entirely,
* but minimizes the time window the kernel might end up killing journald due to SAK). It also makes things
* easier for us so that we don't have to recover from hangups and suchlike triggered on the console. */
fd = open_terminal(tty, O_WRONLY|O_NOCTTY|O_CLOEXEC);
if (fd < 0) {
log_debug_errno(fd, "Failed to open %s for logging: %m", tty);
return;
}
if (writev(fd, iovec, n) < 0)
log_debug_errno(errno, "Failed to write to %s for logging: %m", tty);
}
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