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/*
* sysvinit.c
* Helper to send a runlevel change to sysvinit
*/
/*
* Copyright (c) 2019 The OpenRC Authors.
* See the Authors file at the top-level directory of this distribution and
* https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
*
* This file is part of OpenRC. It is subject to the license terms in
* the LICENSE file found in the top-level directory of this
* distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
* This file may not be copied, modified, propagated, or distributed
* except according to the terms contained in the LICENSE file.
*/
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "einfo.h"
#include "sysvinit.h"
static void sysvinit_send_cmd(struct init_request *request)
{
int fd;
char *p;
size_t bytes;
ssize_t r;
fd = open("/run/initctl", O_WRONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY);
if (fd < 0) {
if (errno != ENOENT)
eerror("Failed to open initctl fifo: %s", strerror(errno));
return;
}
p = (char *) request;
bytes = sizeof(*request);
do {
r = write(fd, p, bytes);
if (r < 0) {
if ((errno == EAGAIN) || (errno == EINTR))
continue;
eerror("Failed to write to /run/initctl: %s", strerror(errno));
return;
}
p += r;
bytes -= r;
} while (bytes > 0);
}
void sysvinit_runlevel(char rl)
{
struct init_request request;
if (!rl)
return;
request = (struct init_request) {
.magic = INIT_MAGIC,
.sleeptime = 0,
.cmd = INIT_CMD_RUNLVL,
.runlevel = rl,
};
sysvinit_send_cmd(&request);
return;
}
/*
* Set environment variables in the init process.
*/
void sysvinit_setenv(const char *name, const char *value)
{
struct init_request request;
size_t nl;
size_t vl;
memset(&request, 0, sizeof(request));
request.magic = INIT_MAGIC;
request.cmd = INIT_CMD_SETENV;
nl = strlen(name);
if (value)
vl = strlen(value);
else
vl = 0;
if (nl + vl + 3 >= (int)sizeof(request.i.data))
return;
memcpy(request.i.data, name, nl);
if (value) {
request.i.data[nl] = '=';
memcpy(request.i.data + nl + 1, value, vl);
}
sysvinit_send_cmd(&request);
return;
}
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