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