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/*-*- 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 "strv.h"
#include "util.h"
#include "log.h"
#include "sd-daemon.h"
#include "sd-readahead.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"
" --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_PID,
ARG_STATUS,
ARG_BOOTED,
ARG_READAHEAD
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "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_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;
}
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