summaryrefslogtreecommitdiff
path: root/src/journal/journalctl.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/journal/journalctl.c')
-rw-r--r--src/journal/journalctl.c327
1 files changed, 327 insertions, 0 deletions
diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
new file mode 100644
index 0000000000..01dceca237
--- /dev/null
+++ b/src/journal/journalctl.c
@@ -0,0 +1,327 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ 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 General Public License as published by
+ the Free Software Foundation; either version 2 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <fcntl.h>
+#include <errno.h>
+#include <stddef.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/poll.h>
+#include <time.h>
+#include <getopt.h>
+
+#include <systemd/sd-journal.h>
+
+#include "log.h"
+#include "util.h"
+#include "build.h"
+#include "pager.h"
+#include "logs-show.h"
+
+static OutputMode arg_output = OUTPUT_SHORT;
+static bool arg_follow = false;
+static bool arg_show_all = false;
+static bool arg_no_pager = false;
+static int arg_lines = -1;
+static bool arg_no_tail = false;
+static bool arg_new_id128 = false;
+static bool arg_quiet = false;
+static bool arg_local = false;
+
+static int help(void) {
+
+ printf("%s [OPTIONS...] {COMMAND} ...\n\n"
+ "Send control commands to or query the journal.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n"
+ " --no-pager Do not pipe output into a pager\n"
+ " -a --all Show all fields, including long and unprintable\n"
+ " -f --follow Follow journal\n"
+ " -n --lines=INTEGER Journal entries to show\n"
+ " --no-tail Show all lines, even in follow mode\n"
+ " -o --output=STRING Change journal output mode (short, short-monotonic,\n"
+ " verbose, export, json, cat)\n"
+ " -q --quiet Don't show privilege warning\n"
+ " --new-id128 Generate a new 128 Bit id\n"
+ " -l --local Only local entries\n",
+ program_invocation_short_name);
+
+ return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+ enum {
+ ARG_VERSION = 0x100,
+ ARG_NO_PAGER,
+ ARG_NO_TAIL,
+ ARG_NEW_ID128
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version" , no_argument, NULL, ARG_VERSION },
+ { "no-pager", no_argument, NULL, ARG_NO_PAGER },
+ { "follow", no_argument, NULL, 'f' },
+ { "output", required_argument, NULL, 'o' },
+ { "all", no_argument, NULL, 'a' },
+ { "lines", required_argument, NULL, 'n' },
+ { "no-tail", no_argument, NULL, ARG_NO_TAIL },
+ { "new-id128", no_argument, NULL, ARG_NEW_ID128 },
+ { "quiet", no_argument, NULL, 'q' },
+ { "local", no_argument, NULL, 'l' },
+ { NULL, 0, NULL, 0 }
+ };
+
+ int c, r;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "hfo:an:ql", options, NULL)) >= 0) {
+
+ switch (c) {
+
+ case 'h':
+ help();
+ return 0;
+
+ case ARG_VERSION:
+ puts(PACKAGE_STRING);
+ puts(DISTRIBUTION);
+ puts(SYSTEMD_FEATURES);
+ return 0;
+
+ case ARG_NO_PAGER:
+ arg_no_pager = true;
+ break;
+
+ case 'f':
+ arg_follow = true;
+ break;
+
+ case 'o':
+ arg_output = output_mode_from_string(optarg);
+ if (arg_output < 0) {
+ log_error("Unknown output '%s'.", optarg);
+ return -EINVAL;
+ }
+
+ break;
+
+ case 'a':
+ arg_show_all = true;
+ break;
+
+ case 'n':
+ r = safe_atoi(optarg, &arg_lines);
+ if (r < 0 || arg_lines < 0) {
+ log_error("Failed to parse lines '%s'", optarg);
+ return -EINVAL;
+ }
+ break;
+
+ case ARG_NO_TAIL:
+ arg_no_tail = true;
+ break;
+
+ case ARG_NEW_ID128:
+ arg_new_id128 = true;
+ break;
+
+ case 'q':
+ arg_quiet = true;
+ break;
+
+ case 'l':
+ arg_local = true;
+ break;
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ log_error("Unknown option code %c", c);
+ return -EINVAL;
+ }
+ }
+
+ if (arg_follow && !arg_no_tail && arg_lines < 0)
+ arg_lines = 10;
+
+ return 1;
+}
+
+static int generate_new_id128(void) {
+ sd_id128_t id;
+ int r;
+ unsigned i;
+
+ r = sd_id128_randomize(&id);
+ if (r < 0) {
+ log_error("Failed to generate ID: %s", strerror(-r));
+ return r;
+ }
+
+ printf("As string:\n"
+ SD_ID128_FORMAT_STR "\n\n"
+ "As UUID:\n"
+ "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n\n"
+ "As macro:\n"
+ "#define MESSAGE_XYZ SD_ID128_MAKE(",
+ SD_ID128_FORMAT_VAL(id),
+ SD_ID128_FORMAT_VAL(id));
+
+ for (i = 0; i < 16; i++)
+ printf("%02x%s", id.bytes[i], i != 15 ? "," : "");
+
+ fputs(")\n", stdout);
+
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ int r, i, fd;
+ sd_journal *j = NULL;
+ unsigned line = 0;
+ bool need_seek = false;
+
+ log_parse_environment();
+ log_open();
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ goto finish;
+
+ if (arg_new_id128) {
+ r = generate_new_id128();
+ goto finish;
+ }
+
+#ifdef HAVE_ACL
+ if (!arg_quiet && geteuid() != 0 && in_group("adm") <= 0)
+ log_warning("Showing user generated messages only. Users in the group 'adm' can see all messages. Pass -q to turn this message off.");
+#endif
+
+ r = sd_journal_open(&j, arg_local ? SD_JOURNAL_LOCAL_ONLY : 0);
+ if (r < 0) {
+ log_error("Failed to open journal: %s", strerror(-r));
+ goto finish;
+ }
+
+ for (i = optind; i < argc; i++) {
+ r = sd_journal_add_match(j, argv[i], strlen(argv[i]));
+ if (r < 0) {
+ log_error("Failed to add match: %s", strerror(-r));
+ goto finish;
+ }
+ }
+
+ fd = sd_journal_get_fd(j);
+ if (fd < 0) {
+ log_error("Failed to get wakeup fd: %s", strerror(-fd));
+ goto finish;
+ }
+
+ if (arg_lines >= 0) {
+ r = sd_journal_seek_tail(j);
+ if (r < 0) {
+ log_error("Failed to seek to tail: %s", strerror(-r));
+ goto finish;
+ }
+
+ r = sd_journal_previous_skip(j, arg_lines);
+ } else {
+ r = sd_journal_seek_head(j);
+ if (r < 0) {
+ log_error("Failed to seek to head: %s", strerror(-r));
+ goto finish;
+ }
+
+ r = sd_journal_next(j);
+ }
+
+ if (r < 0) {
+ log_error("Failed to iterate through journal: %s", strerror(-r));
+ goto finish;
+ }
+
+ if (!arg_no_pager && !arg_follow) {
+ columns();
+ pager_open();
+ }
+
+ if (arg_output == OUTPUT_JSON) {
+ fputc('[', stdout);
+ fflush(stdout);
+ }
+
+ for (;;) {
+ for (;;) {
+ if (need_seek) {
+ r = sd_journal_next(j);
+ if (r < 0) {
+ log_error("Failed to iterate through journal: %s", strerror(-r));
+ goto finish;
+ }
+ }
+
+ if (r == 0)
+ break;
+
+ line ++;
+
+ r = output_journal(j, arg_output, line, 0, arg_show_all);
+ if (r < 0)
+ goto finish;
+
+ need_seek = true;
+ }
+
+ if (!arg_follow)
+ break;
+
+ r = fd_wait_for_event(fd, POLLIN, (usec_t) -1);
+ if (r < 0) {
+ log_error("Couldn't wait for event: %s", strerror(-r));
+ goto finish;
+ }
+
+ r = sd_journal_process(j);
+ if (r < 0) {
+ log_error("Failed to process: %s", strerror(-r));
+ goto finish;
+ }
+ }
+
+ if (arg_output == OUTPUT_JSON)
+ fputs("\n]\n", stdout);
+
+finish:
+ if (j)
+ sd_journal_close(j);
+
+ pager_close();
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-18 11:01:36 +0000