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/*
* srp_dm_multipath_daemon - daemon that executes multipath calls
* Copyright (c) 2007 Mellanox Technologies Ltd. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* 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.
*
* $Author: ishai Rabinovitz [ishai@mellanox.co.il]$
*
*/
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <string.h>
#include <sys/wait.h>
#include "srp_dm_multipath_daemon.h"
enum queue_mode {
EMPTY_QUEUE = 1,
SERIAL_QUEUE = 2,
REGULAR_QUEUE = 3,
};
void sleep_until_wakeup(time_t wakeup_time)
{
int ret = wakeup_time - time(NULL);
while (ret > 0) {
sleep(ret);
ret = wakeup_time - time(NULL);
}
}
/* TODO: change system to exec */
int main(int argc, char **argv)
{
enum queue_mode mode = SERIAL_QUEUE;
struct key_n_msg recv_st;
int msgqid;
char cmd_str[255];
int status;
int count;
if (argc > 1 && argv[argc-1][0] == '-')
switch (argv[argc-1][1]) {
case 's':
mode = SERIAL_QUEUE;
break;
case 'r':
mode = REGULAR_QUEUE;
break;
case 'e':
mode = EMPTY_QUEUE;
break;
default:
break;
}
msgqid = msgget(ftok(KEY_FILE, 'a'), IPC_CREAT | 0600);
if (msgqid == -1) {
perror("msgget");
exit(1);
}
/* Clean the queue */
while (msgrcv(msgqid, (void *) &recv_st,
sizeof(struct msg), 1L, IPC_NOWAIT) != -1)
;
while (1) {
while (waitpid((pid_t)-1, &status, WNOHANG) > 0)
;
if (msgrcv(msgqid, (void *) &recv_st,
sizeof(struct msg), 1L, 0) == -1) {
perror("msgrcv");
return -1;
}
sleep_until_wakeup(recv_st.msg.wakeup_time);
switch (mode) {
case EMPTY_QUEUE:
count = 0;
while (recv_st.msg.type == 'M' &&
msgrcv(msgqid, (void *) &recv_st,
sizeof(struct msg), 1L, IPC_NOWAIT) != -1)
count++;
if (count) {
sleep_until_wakeup(recv_st.msg.wakeup_time);
system(recv_st.msg.path);
}
if (recv_st.msg.type == 'K') {
sprintf(cmd_str, "%s &",
recv_st.msg.path);
system(cmd_str);
}
break;
case SERIAL_QUEUE:
case REGULAR_QUEUE:
if (recv_st.msg.type == 'M')
sprintf(cmd_str, "%s %d:%d %c",
recv_st.msg.path,
recv_st.msg.major, recv_st.msg.minor,
mode==REGULAR_QUEUE?'&':' ');
else
sprintf(cmd_str, "%s %c",
recv_st.msg.path,
mode==REGULAR_QUEUE?'&':' ');
system(cmd_str);
break;
/*
pid = fork();
if (pid < 0) {
perror(argv[0]);
exit(1);
} else if (!pid) {
system(cmd_str);
exit(0);
}
break;
*/
default:
/* Should never get here */
exit(1);
break;
}
}
}
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