11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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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[STRLEN("[] ") + DECIMAL_STR_MAX(ts.tv_sec) + DECIMAL_STR_MAX(ts.tv_nsec)-3 + 1];
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char header_pid[STRLEN("[]: ") + DECIMAL_STR_MAX(pid_t)];
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_cleanup_free_ char *ident_buf = NULL;
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_cleanup_close_ int fd = -1;
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const char *tty;
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int n = 0;
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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".%06"PRI_NSEC"] ",
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ts.tv_sec,
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(nsec_t)ts.tv_nsec / 1000);
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iovec[n++] = IOVEC_MAKE_STRING(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[n++] = IOVEC_MAKE_STRING(identifier);
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iovec[n++] = IOVEC_MAKE_STRING(header_pid);
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} else if (identifier) {
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iovec[n++] = IOVEC_MAKE_STRING(identifier);
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iovec[n++] = IOVEC_MAKE_STRING(": ");
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}
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/* Fourth: message */
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iovec[n++] = IOVEC_MAKE_STRING(message);
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iovec[n++] = IOVEC_MAKE_STRING("\n");
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tty = 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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}
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