| /*** |
| 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 "formats-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)]; |
| int n = 0, fd; |
| _cleanup_free_ char *ident_buf = NULL; |
| const char *tty; |
| |
| 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".%06ld] ", |
| ts.tv_sec, |
| ts.tv_nsec / 1000); |
| IOVEC_SET_STRING(iovec[n++], 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_SET_STRING(iovec[n++], identifier); |
| |
| IOVEC_SET_STRING(iovec[n++], header_pid); |
| } else if (identifier) { |
| IOVEC_SET_STRING(iovec[n++], identifier); |
| IOVEC_SET_STRING(iovec[n++], ": "); |
| } |
| |
| /* Fourth: message */ |
| IOVEC_SET_STRING(iovec[n++], message); |
| IOVEC_SET_STRING(iovec[n++], "\n"); |
| |
| tty = s->tty_path ? 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); |
| |
| safe_close(fd); |
| } |