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/**
* Copyright © 2015 Mattias Andrée <maandree@member.fsf.org>
*
* 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 "daemon.h"
#include <sys/file.h>
#include <sys/stat.h>
/**
* Subroutine to the sat daemon: add job.
*
* @param argc Should be 3.
* @param argv The name of the process, the pathname of the socket,
* and the pathname to the state file.
* @return 0 The process was successful.
* @return 1 The process failed queuing the job.
*/
int
main(int argc, char *argv[])
{
size_t n = 0, elements = 0, i;
ssize_t r;
char *message = NULL;
int msg_argc;
struct job *job = NULL;
struct stat attr;
DAEMON_PROLOGUE;
/* Receive and validate message. */
t (readall(SOCK_FILENO, &message, &n));
shutdown(SOCK_FILENO, SHUT_RD);
t (n < sizeof(int) + sizeof(clockid_t) + sizeof(struct timespec));
n -= sizeof(int) + sizeof(clockid_t) + sizeof(struct timespec);
msg_argc = *(int *)(message + n);
t ((msg_argc < 1) || !n || message[n - 1]);
for (i = n; i--; elements += !message[i]);
t (elements < (size_t)msg_argc);
/* Parse message. */
t (!(job = malloc(sizeof(*job) + n)));
job->argc = msg_argc;
job->clk = *(clockid_t *)(message + n + sizeof(int));
job->ts = *(struct timespec *)(message + n + sizeof(int) + sizeof(clockid_t));
job->n = n;
memcpy(job->payload, message, n);
/* Update state file. */
t (flock(STATE_FILENO, LOCK_EX));
t (fstat(STATE_FILENO, &attr));
r = preadn(STATE_FILENO, &(job->no), sizeof(job->no), 0);
t (r < 0);
if (r < (ssize_t)sizeof(job->no))
job->no = 0;
else
job->no += 1;
t (pwriten(STATE_FILENO, &(job->no), sizeof(job->no), 0) < (ssize_t)sizeof(job->no));
if (attr.st_size < (off_t)sizeof(job->no))
attr.st_size = (off_t)sizeof(job->no);
n += sizeof(*job);
t (pwriten(STATE_FILENO, job, n, attr.st_size) < (ssize_t)n);
fsync(STATE_FILENO);
t (flock(STATE_FILENO, LOCK_UN));
DAEMON_CLEANUP_START;
free(message);
free(job);
DAEMON_CLEANUP_END;
}
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