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/*
* ipcmk.c - used to create ad-hoc IPC segments
*
* Copyright (C) 2008 Hayden A. James (hayden.james@gmail.com)
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <sys/msg.h>
key_t createKey(void)
{
srandom( time( NULL ) );
return random();
}
int createShm(size_t size, int permission)
{
int result = -1;
int shmid;
key_t key = createKey();
if (-1 != (shmid = shmget(key, size, permission | IPC_CREAT)))
result = shmid;
return result;
}
int createMsg(int permission)
{
int result = -1;
int msgid;
key_t key = createKey();
if (-1 != (msgid = msgget(key, permission | IPC_CREAT)))
result = msgid;
return result;
}
int createSem(int nsems, int permission)
{
int result = -1;
int semid;
key_t key = createKey();
if (-1 != (semid = semget(key, nsems, permission | IPC_CREAT)))
result = semid;
return result;
}
void usage(char *progname)
{
fprintf(stderr, "usage: %s [-M size] [-S nsems] [-Q] [-p permission]\n", progname);
}
int main(int argc, char **argv)
{
int permission = 0644;
int opt;
size_t size = 0;
int nsems = 0;
int doShm = 0, doMsg = 0, doSem = 0;
while((opt = getopt(argc, argv, "M:QS:p:")) != -1) {
switch(opt) {
case 'M':
size = atoi(optarg);
doShm = 1;
break;
case 'Q':
doMsg = 1;
break;
case 'S':
nsems = atoi(optarg);
doSem = 1;
break;
case 'p':
permission = strtoul(optarg, NULL, 8);
break;
default:
doShm = doMsg = doSem = 0;
break;
}
}
if (doShm) {
int shmid;
if (-1 == (shmid = createShm(size, permission)))
fprintf(stderr, "%s\n", strerror(errno));
else
fprintf(stdout, "%s%d\n", "Shared memory id: ", shmid);
}
if (doMsg) {
int msgid;
if (-1 == (msgid = createMsg(permission)))
fprintf(stderr, "%s\n", strerror(errno));
else
fprintf(stdout, "%s%d\n", "Message queue id: ", msgid);
}
if (doSem) {
int semid;
if (-1 == (semid = createSem(nsems, permission)))
fprintf(stderr, "%s\n", strerror(errno));
else
fprintf(stdout, "%s%d\n", "Semaphore id: ", semid);
}
if(!doShm && !doMsg && !doSem)
usage(argv[0]);
return 0;
}
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