+/* WriteShm.c
+ *
+ * Copyright (C) 2002 Simone Piccardi
+ *
+ * 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.
+ */
+/*****************************************************************************
+ *
+ * File WriteShm.c:
+ *
+ * An example of POSIX shared memory use: wwrite some content to a
+ * shared memory segment
+ *
+ * Author: S. Piccardi Jan. 2003
+ *
+ * $Id: WriteShm.c,v 1.1 2003/02/03 18:07:38 piccardi Exp $
+ *
+ *****************************************************************************/
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h> /* directory */
+#include <stdlib.h> /* C standard library */
+#include <unistd.h>
+#include <stdio.h>
+
+#include "Gapil.h"
+#include "macros.h"
+
+/* Help printing routine */
+void usage(void);
+
+int main(int argc, char *argv[])
+{
+ int i;
+ int size = 4096;
+ char * file_name = NULL;
+ int fd = 0;
+ int mutex;
+ char * mutex_file;
+ void * shm_ptr;
+ /*
+ * Input section: decode command line parameters
+ * Use getopt function
+ */
+ opterr = 0; /* don't want writing to stderr */
+ while ( (i = getopt(argc, argv, "hs:f:")) != -1) {
+ switch (i) {
+ /*
+ * Handling options
+ */
+ case 's': /* set pause (in sec.) */
+ size = strtol(optarg, NULL, 10);
+ break;
+ case 'f': /* set pause (in sec.) */
+ file_name = optarg;
+ break;
+ case 'h': /* help option */
+ printf("Wrong -h option use\n");
+ usage();
+ return -1;
+ break;
+ case '?': /* unrecognized options */
+ printf("Unrecognized options -%c\n",optopt);
+ usage();
+ default: /* should not reached */
+ usage();
+ }
+ }
+ /* ***********************************************************
+ *
+ * Options processing completed
+ *
+ * Main code beginning
+ *
+ * ***********************************************************/
+ if ((argc - optind) != 1) { /* There must be remaing parameters */
+ printf("Wrong number of arguments %d\n", argc - optind);
+ usage();
+ }
+ mutex_file = tempnam("/tmp","mutex");
+ if ((mutex = CreateMutex(mutex_file)) == -1) { /* get a Mutex */
+ perror("Cannot create mutex");
+ goto errmutex;
+ }
+ /* main loop */
+ shm_ptr = CreateShm(argv[1], size, 0644, 0);
+ if (shm_ptr == NULL) {
+ perror("Error creating shared memory");
+ goto errshared;
+ }
+ if (file_name) {
+ fd = open(file_name, O_RDONLY);
+ }
+ FullRead(fd, shm_ptr, size);
+// RemoveShm(argv[1]);
+ RemoveMutex(mutex_file);
+ exit(0);
+ errshared:
+ RemoveShm(argv[1]);
+ RemoveMutex(mutex_file);
+ errmutex:
+ exit(1);
+}
+/*
+ * routine to print usage info and exit
+ */
+void usage(void) {
+ printf("Program myls: list file in a directory \n");
+ printf("Usage:\n");
+ printf(" WriteShm [-h] [-s size] [-f file] name \n");
+ printf(" -h print this help\n");
+ printf(" -s size size of segment \n");
+ printf(" -f file filename to read contents \n");
+ exit(1);
+}