/*-*- 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 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 <stdio.h> #include <getopt.h> #include <assert.h> #include <unistd.h> #include <stdlib.h> #include <errno.h> #include <fcntl.h> #include "systemd/sd-journal.h" #include "util.h" #include "build.h" static char *arg_identifier = NULL; static int arg_priority = LOG_INFO; static bool arg_level_prefix = true; static void 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); } 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 }, {} }; 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(SYSTEMD_FEATURES); return 0; case 't': free(arg_identifier); if (isempty(optarg)) arg_identifier = NULL; else { arg_identifier = strdup(optarg); if (!arg_identifier) return log_oom(); } 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; } case '?': return -EINVAL; default: assert_not_reached("Unhandled option"); } 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: %m"); r = -errno; goto finish; } if (fd >= 3) safe_close(fd); fd = -1; if (argc <= optind) execl("/bin/cat", "/bin/cat", NULL); else execvp(argv[optind], argv + optind); r = -errno; /* 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: %s", strerror(-r)); finish: safe_close(fd); safe_close(saved_stderr); return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; }