--- /dev/null
+.\" Copyright 2008 Hayden A. James (hayden.james@gmail.com)
+.\" May be distributed under the GNU General Public License
+.TH "IPCMK" "1" "21 March 2008" "ipcmk" "Linux Programmer's Manual"
+.SH "NAME"
+ipcmk \- create various ipc resources
+.SH "SYNOPSIS"
+.B ipcmk [ \-M \fIsize\fR ] [ \-p \fImode\fR ]
+.br
+.B ipcmk [ \-S \fInsems\fR ] [ \-p \fImode\fR ]
+.br
+.B ipcmk [ \-Q ] [ \-p \fImode\fR ]
+.SH "DESCRIPTION"
+.B ipcmk
+allows you to create shared memory segments, message queues or semaphore arrays.
+.SH "OPTIONS"
+Resources may be specified as follows:
+.TP
+.BI \-M " size"
+shared memory segment of size \fB\fIsize\fR\fR
+.TP
+.BI \-S " nsems"
+semaphore array with \fB\fInsems\fR\fR elements
+.TP
+.BI \-Q
+message queue
+.TP
+Other options
+.TP
+.BI \-p " mode"
+permission for the resource (default is 0644)
+.PP
+.SH "SEE ALSO"
+.BR ipcrm (1),
+.BR ipcs (1)
+.SH "AUTHOR"
+Hayden A. James (hayden.james@gmail.com)
+.SH "AVAILABILITY"
+The ipcmk command is part of the util\-linux\-ng package and is available from
+ftp://ftp.kernel.org/pub/linux/utils/util\-linux\-ng/.
--- /dev/null
+/*
+ * 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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