Abbozzo di fortune server con le message queues

[gapil.git] / sources / MQFortuneServer.c

diff --git a/sources/MQFortuneServer.c b/sources/MQFortuneServer.c
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+/* MQFortuneServer.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 server - Using Messag queues
+ *
+ * Author: Simone Piccardi
+ * Aug. 2002
+ *
+ * Usage: fortuned -h give all info
+ *
+ * $Id: MQFortuneServer.c,v 1.1 2002/08/26 21:11:49 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 <fcntl.h>      /*  */
+
+#include "macros.h"
+#include "wrappers.h"
+
+/* Subroutines declaration */
+void usage(void);
+void HandSIGTERM(int signo);
+int FortuneParse(char *file, char **fortune, int n);
+
+/* name of well known fifo */
+int main(int argc, char *argv[])
+{
+/* Variables definition */
+    int i, n = 0;
+    char **fortune;
+    struct msgbuf_read {
+       long mtype;      /* message type, must be > 0 */
+       int pid;         /* message data */
+    } msg_read;
+    struct msgbuf_write {
+       long mtype;      /* message type, must be > 0 */
+       char mtext[MSGMAX];  /* message data */
+    } msg_write;
+    int msgid;
+    key_t key;
+    int 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, "hn:f:")) != -1) {
+       switch (i) {
+       /* 
+        * Handling options 
+        */ 
+       case 'h':  
+           printf("Wrong -h option use\n");
+           usage();
+           return(0);
+           break;
+       case 'f':
+           fortunefilename = optarg;
+           break;
+       case 'n':
+           n = strtol(optarg, NULL, 10);
+           fortune = (char **) calloc(sizeof(*fortune), n);
+           break;
+       case '?':                                    /* unrecognized options */
+           printf("Unrecognized options -%c\n",optopt);
+           usage();
+       default:                                       /* should not reached */
+           usage();
+       }
+    }
+    /* ***********************************************************
+     * 
+     *          Options processing completed
+     *
+     *               Main code beginning
+     * 
+     * ***********************************************************/
+    if (n==0) usage();          /* if no pool depth exit printing usage info */
+    Signal(SIGTERM, HandSIGTERM);            /* set handlers for termination */
+    Signal(SIGINT, HandSIGTERM);
+    Signal(SIGQUIT, HandSIGTERM);
+    i = FortuneParse(fortunefilename, fortune, n);          /* parse phrases */
+    for (n=0; n<i; n++) debug("%s%%\n", fortune[n]);
+    /* 
+     * Comunication section 
+     */
+    key = ftok("./MQFortuneServer.c", 1); 
+    msgid = msgget(key, IPC_CREAT|666); 
+    
+    /* Main body: loop over requests */
+    while (1) {
+       msgrcv(msgid, &msg_read, 1, sizeof(int), MSG_NOERROR);
+       n = random() % i;                             /* select random value */
+       strncpy(msgbuf_write.mtext, fortune[n], MSGMAX);
+       size = min(strlen(fortune[n])+1, MSGMAX);  
+       msgsnd(msgid,  &msg_write, size, 0);
+    }
+    debug("Exiting for unknown reasons\n");
+}
+/*
+ * 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);
+}
+/*
+ * Signal Handler to manage termination
+ */
+void HandSIGTERM(int signo) {
+    debug("Terminated by %s\n", strsignal(signo));
+    unlink(fifoname);
+    exit(0);
+}