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authorLennart Poettering <lennart@poettering.net>2012-01-13 23:17:54 +0100
committerLennart Poettering <lennart@poettering.net>2012-01-14 01:54:33 +0100
commit755a02c6800246e7e293897d0594fe7e7531ba59 (patch)
tree6466acaaddf50cb29f4f9b55425191365ee32c6e /src
parent3043935f02da2e680b37cf282587106ad05440ee (diff)
journal: add new system-cat tool as kind of a more powerfull BSD logger
Diffstat (limited to 'src')
-rw-r--r--src/journal/cat.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/src/journal/cat.c b/src/journal/cat.c
new file mode 100644
index 0000000000..6745f1ce0a
--- /dev/null
+++ b/src/journal/cat.c
@@ -0,0 +1,181 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2012 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 <stdio.h>
+#include <getopt.h>
+#include <assert.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/fcntl.h>
+
+#include <systemd/sd-journal.h>
+
+#include "util.h"
+#include "build.h"
+
+static char *arg_identifier = NULL;
+static char arg_priority = LOG_INFO;
+static bool arg_level_prefix = true;
+
+static int help(void) {
+
+ printf("%s [OPTIONS...] {COMMAND} ...\n\n"
+ "Execute process with stdout/stderr connected to the journal.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n"
+ " -t --identifier=STRING Set syslog identifier\n"
+ " -p --priority=PRIORITY Set priority value (0..7)\n"
+ " --level-prefix=BOOL Control whether level prefix shall be parsed\n",
+ program_invocation_short_name);
+
+ return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+ enum {
+ ARG_VERSION = 0x100,
+ ARG_LEVEL_PREFIX
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version" , no_argument, NULL, ARG_VERSION },
+ { "identifier", required_argument, NULL, 't' },
+ { "priority", required_argument, NULL, 'p' },
+ { "level-prefix", required_argument, NULL, ARG_LEVEL_PREFIX },
+ { NULL, 0, NULL, 0 }
+ };
+
+ int c;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "+ht:p:", options, NULL)) >= 0) {
+
+ switch (c) {
+
+ case 'h':
+ help();
+ return 0;
+
+ case ARG_VERSION:
+ puts(PACKAGE_STRING);
+ puts(DISTRIBUTION);
+ puts(SYSTEMD_FEATURES);
+ return 0;
+
+ case 't':
+ free(arg_identifier);
+ if (isempty(optarg))
+ arg_identifier = NULL;
+ else {
+ arg_identifier = strdup(optarg);
+ if (!arg_identifier) {
+ log_error("Out of memory.");
+ return -ENOMEM;
+ }
+ }
+ break;
+
+ case 'p':
+ arg_priority = log_level_from_string(optarg);
+ if (arg_priority < 0) {
+ log_error("Failed to parse priority value.");
+ return arg_priority;
+ }
+ break;
+
+ case ARG_LEVEL_PREFIX: {
+ int k;
+
+ k = parse_boolean(optarg);
+ if (k < 0) {
+ log_error("Failed to parse level prefix value.");
+ return k;
+ }
+ arg_level_prefix = k;
+ break;
+ }
+
+ default:
+ log_error("Unknown option code %c", c);
+ return -EINVAL;
+ }
+ }
+
+ return 1;
+}
+
+int main(int argc, char *argv[]) {
+ int r, fd = -1, saved_stderr = -1;
+
+ log_parse_environment();
+ log_open();
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ goto finish;
+
+ fd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix);
+ if (fd < 0) {
+ log_error("Failed to create stream fd: %s", strerror(fd));
+ r = fd;
+ goto finish;
+ }
+
+ saved_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3);
+
+ if (dup3(fd, STDOUT_FILENO, 0) < 0 ||
+ dup3(fd, STDERR_FILENO, 0) < 0) {
+ log_error("Failed to duplicate fd: %s", strerror(fd));
+ r = -errno;
+ goto finish;
+ }
+
+ if (fd >= 3)
+ close_nointr_nofail(fd);
+
+ fd = -1;
+
+ if (argc <= optind)
+ execl("/bin/cat", "/bin/cat", NULL);
+ else
+ execvp(argv[optind], argv + optind);
+
+ /* Let's try to restore a working stderr, so we can print the error message */
+ if (saved_stderr >= 0)
+ dup3(saved_stderr, STDERR_FILENO, 0);
+
+ log_error("Failed to execute process: %m");
+ r = -errno;
+
+finish:
+ if (fd >= 0)
+ close_nointr_nofail(fd);
+
+ if (saved_stderr >= 0)
+ close_nointr_nofail(saved_stderr);
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}