diff options
Diffstat (limited to 'src/notify.c')
| -rw-r--r-- | src/notify.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/src/notify.c b/src/notify.c new file mode 100644 index 0000000000..943808eb0d --- /dev/null +++ b/src/notify.c @@ -0,0 +1,228 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2010 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 <error.h> +#include <errno.h> +#include <unistd.h> +#include <stdlib.h> +#include <string.h> + +#include <systemd/sd-daemon.h> + +#include "strv.h" +#include "util.h" +#include "log.h" +#include "sd-readahead.h" +#include "build.h" + +static bool arg_ready = false; +static pid_t arg_pid = 0; +static const char *arg_status = NULL; +static bool arg_booted = false; +static const char *arg_readahead = NULL; + +static int help(void) { + + printf("%s [OPTIONS...] [VARIABLE=VALUE...]\n\n" + "Notify the init system about service status updates.\n\n" + " -h --help Show this help\n" + " --version Show package version\n" + " --ready Inform the init system about service start-up completion\n" + " --pid[=PID] Set main pid of daemon\n" + " --status=TEXT Set status text\n" + " --booted Returns 0 if the system was booted up with systemd, non-zero otherwise\n" + " --readahead=ACTION Controls read-ahead operations\n", + program_invocation_short_name); + + return 0; +} + +static int parse_argv(int argc, char *argv[]) { + + enum { + ARG_READY = 0x100, + ARG_VERSION, + ARG_PID, + ARG_STATUS, + ARG_BOOTED, + ARG_READAHEAD + }; + + static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { "version", no_argument, NULL, ARG_VERSION }, + { "ready", no_argument, NULL, ARG_READY }, + { "pid", optional_argument, NULL, ARG_PID }, + { "status", required_argument, NULL, ARG_STATUS }, + { "booted", no_argument, NULL, ARG_BOOTED }, + { "readahead", required_argument, NULL, ARG_READAHEAD }, + { NULL, 0, NULL, 0 } + }; + + int c; + + assert(argc >= 0); + assert(argv); + + while ((c = getopt_long(argc, argv, "h", 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_READY: + arg_ready = true; + break; + + case ARG_PID: + + if (optarg) { + if (parse_pid(optarg, &arg_pid) < 0) { + log_error("Failed to parse PID %s.", optarg); + return -EINVAL; + } + } else + arg_pid = getppid(); + + break; + + case ARG_STATUS: + arg_status = optarg; + break; + + case ARG_BOOTED: + arg_booted = true; + break; + + case ARG_READAHEAD: + arg_readahead = optarg; + break; + + case '?': + return -EINVAL; + + default: + log_error("Unknown option code %c", c); + return -EINVAL; + } + } + + if (optind >= argc && + !arg_ready && + !arg_status && + !arg_pid && + !arg_booted && + !arg_readahead) { + help(); + return -EINVAL; + } + + return 1; +} + +int main(int argc, char* argv[]) { + char* our_env[4], **final_env = NULL; + unsigned i = 0; + char *status = NULL, *cpid = NULL, *n = NULL; + int r, retval = EXIT_FAILURE; + + log_parse_environment(); + log_open(); + + if ((r = parse_argv(argc, argv)) <= 0) { + retval = r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; + goto finish; + } + + if (arg_booted) + return sd_booted() <= 0; + + if (arg_readahead) { + if ((r = sd_readahead(arg_readahead)) < 0) { + log_error("Failed to issue read-ahead control command: %s", strerror(-r)); + goto finish; + } + } + + if (arg_ready) + our_env[i++] = (char*) "READY=1"; + + if (arg_status) { + if (!(status = strappend("STATUS=", arg_status))) { + log_error("Failed to allocate STATUS string."); + goto finish; + } + + our_env[i++] = status; + } + + if (arg_pid > 0) { + if (asprintf(&cpid, "MAINPID=%lu", (unsigned long) arg_pid) < 0) { + log_error("Failed to allocate MAINPID string."); + goto finish; + } + + our_env[i++] = cpid; + } + + our_env[i++] = NULL; + + if (!(final_env = strv_env_merge(2, our_env, argv + optind))) { + log_error("Failed to merge string sets."); + goto finish; + } + + if (strv_length(final_env) <= 0) { + retval = EXIT_SUCCESS; + goto finish; + } + + if (!(n = strv_join(final_env, "\n"))) { + log_error("Failed to concatenate strings."); + goto finish; + } + + if ((r = sd_notify(false, n)) < 0) { + log_error("Failed to notify init system: %s", strerror(-r)); + goto finish; + } + + retval = r <= 0 ? EXIT_FAILURE : EXIT_SUCCESS; + +finish: + free(status); + free(cpid); + free(n); + + strv_free(final_env); + + return retval; +} |