Codice del client

diff --git a/sources/MQFortuneClient.c b/sources/MQFortuneClient.c
new file mode 100644 (file)
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+++ b/sources/MQFortuneClient.c
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+/* MQFortuneClient.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.
+ */
+/****************************************************************
+ *
+ * Program fortuned 
+ * Fortune Cleint - Using Message Queues
+ *
+ * Author: Simone Piccardi
+ * Oct. 2002
+ *
+ * Usage: fortune -h give all info
+ *
+ * $Id: MQFortuneClient.c,v 1.1 2002/10/20 22:42:48 piccardi Exp $
+ *
+ ****************************************************************/
+/* 
+ * Include needed headers
+ */
+#include <sys/types.h>   /* predefined types */
+#include <sys/stat.h>    /*  */
+#include <unistd.h>      /* include unix standard library */
+#include <stdio.h>       /* include standard I/O library */
+#include <stdlib.h>     /* standard library */
+#include <string.h>     /* ANSI C standard string */
+#include <errno.h>      /* errorstring */
+#include <signal.h>     /* signals */
+#include <sys/ipc.h>
+#include <sys/msg.h>
+
+#include "macros.h"
+#include "wrappers.h"
+
+/* Maximum message size */
+#define MSGMAX 8192
+
+/* Subroutines declaration */
+void usage(void);
+
+int main(int argc, char *argv[])
+{
+/* Variables definition */
+    int i;
+    struct msgbuf_read {          /* message struct to ask fortune to server */
+       long mtype;                               /* message type, must be 1 */
+       long pid;             /* message data, must be the pid of the client */
+    } msg_read;
+    struct msgbuf_write {        /* message struct to get result from server */
+       long mtype;            /* message type, will be the pid of the client*/
+       char mtext[MSGMAX];             /* message data, will be the fortune */
+    } msg_write;
+    int msgid;                                   /* Message queue identifier */
+    key_t key;                                          /* Message queue key */
+    int size;                                                /* message size */
+    /*
+     * Input section: decode parameters passed in the calling 
+     * Use getopt function
+     */
+    opterr = 0;                                     /* don't want writing to stderr */
+    while ( (i = getopt(argc, argv, "h")) != -1) {
+       switch (i) {
+       /* 
+        * Handling options 
+        */ 
+       case 'h':  
+           usage();
+           return(0);
+           break;
+       case '?':                                    /* unrecognized options */
+           printf("Unrecognized options -%c\n", optopt);
+           usage();
+       default:                                       /* should not reached */
+           usage();
+       }
+    }
+    /* ***********************************************************
+     * 
+     *          Options processing completed
+     *
+     *               Main code beginning
+     * 
+     * ***********************************************************/
+    /* 
+     * Comunication section 
+     */
+    key = ftok("./MQFortuneServer.c", 1); 
+    msgid = msgget(key, 0); 
+    if (msgid < 0) {
+       perror("Cannot find message queue");
+       exit(1);
+    }
+
+    /* Main body: do request and write result */
+    msg_read.mtype = 1;                      /* type for request is always 1 */
+    msg_read.pid = getpid();                   /* use pid for communications */
+    size = sizeof(msg_read.pid);  
+    msgsnd(msgid, &msg_read, size, 0);               /* send request message */
+    debug("sent request from %d\n", msg_read.pid);
+    msgrcv(msgid, &msg_write, MSGMAX, msg_read.pid, MSG_NOERROR);
+    printf("%s", msg_write.mtext);
+}
+/*
+ * routine to print usage info and exit
+ */
+void usage(void) {
+    printf("Elementary fortune server\n");
+    printf("Usage:\n");
+    printf("  fortuned [-h] [-f] -n XXX \n");
+    printf("  -h   print this help\n");
+    printf("  -f filename   set file for fortunes\n");
+    printf("  -n XXX        set pool depth\n");
+    exit(1);
+}