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client.c
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client.c
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/* Simple telinit client
*
* Copyright (c) 2008-2010 Claudio Matsuoka <cmatsuoka@gmail.com>
* Copyright (c) 2008-2015 Joachim Nilsson <troglobit@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "config.h" /* Generated by configure script */
#include <ctype.h>
#include <getopt.h>
#include <stdio.h>
#include "finit.h"
#include "libite/lite.h"
static int do_send(int cmd, int runlevel)
{
int fd;
int result = 255;
ssize_t len;
struct init_request rq = {
.magic = INIT_MAGIC,
.cmd = cmd,
.runlevel = runlevel,
};
if (!fexist(FINIT_FIFO)) {
fprintf(stderr, "%s does not support %s!\n", __progname, FINIT_FIFO);
return 1;
}
fd = open(FINIT_FIFO, O_RDWR);
if (-1 == fd) {
perror("Failed opening " FINIT_FIFO);
return 1;
}
len = write(fd, &rq, sizeof(rq));
if (sizeof(rq) == len)
result = 0;
close(fd);
return result;
}
/* telinit q | telinit <0-9> */
static int usage(int rc)
{
fprintf(stderr, "Usage: %s [OPTIONS] [q | Q | 0-9]\n\n"
"Options:\n"
" -h, --help This help text\n\n"
" -V, --version Show Finit version\n\n"
"Commands:\n"
" q | Q Reload *.conf in /etc/finit.d/, like SIGHUP\n"
" 0 - 9 Change runlevel: 0 halt, 6 reboot\n\n", __progname);
return rc;
}
int client(int argc, char *argv[])
{
int c;
struct option long_options[] = {
{"help", 0, NULL, 'h'},
{"version", 0, NULL, 'v'},
{NULL, 0, NULL, 0}
};
verbose = 0;
while ((c = getopt_long(argc, argv, "h?v", long_options, NULL)) != EOF) {
switch(c) {
case 'v':
return puts("v" VERSION) == EOF;
case 'h':
case '?':
return usage(0);
}
}
if (optind < argc) {
int req = (int)argv[optind][0];
/* Compat: 'init <0-9>' */
if (isdigit(req))
return do_send(INIT_CMD_RUNLVL, req);
if (req == 'q' || req == 'Q')
return do_send(INIT_CMD_RELOAD, 0);
}
return usage(1);
}
/**
* Local Variables:
* version-control: t
* indent-tabs-mode: t
* c-file-style: "linux"
* End:
*/