Aggiunto esempio di server per le fortunes, basato sulle fifo.

[gapil.git] / sources / FortuneClient.c

diff --git a/sources/FortuneClient.c b/sources/FortuneClient.c
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+/* FortuneClient.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 fortune 
+ * Fortune client
+ *
+ * Author: Simone Piccardi
+ * Aug. 2002
+ *
+ * Usage: fortune -h give all info
+ *
+ * $Id: FortuneClient.c,v 1.1 2002/08/18 10:34:09 piccardi Exp $
+ *
+ ****************************************************************/
+/* 
+ * Include needed headers
+ */
+#include <sys/types.h>   /* predefined types */
+#include <unistd.h>      /* include unix standard library */
+#include <arpa/inet.h>   /* IP addresses conversion utiliites */
+#include <stdio.h>      /* include standard I/O library */
+#include <errno.h>
+#include <fcntl.h>
+
+#include "macros.h"
+
+/* Subroutines declaration */
+void usage(void);
+
+int main(int argc, char *argv[])
+{
+/* Variables definition */
+    int n = 0;
+    char *fortunefilename = "/tmp/fortune.fifo";
+    char line[80];
+    int fifo_server, fifo_client;
+    char fifoname[80];
+    int nread;
+    char buffer[PIPE_BUF];
+    /*
+     * Input section: decode parameters passed in the calling 
+     * Use getopt function
+     */
+    int i;
+    opterr = 0;         /* don't want writing to stderr */
+    while ( (i = getopt(argc, argv, "hf:")) != -1) {
+       switch (i) {
+       /* 
+        * Handling options 
+        */ 
+       case 'h':  
+           printf("Wrong -h option use\n");
+           usage();
+           return(0);
+           break;
+       case 'f':
+           fortunefilename = optarg;
+           break;
+       case '?':   /* unrecognized options */
+           printf("Unrecognized options -%c\n",optopt);
+           usage();
+       default:    /* should not reached */
+           usage();
+       }
+    }
+    /* ***********************************************************
+     * 
+     *          Options processing completed
+     *
+     *               Main code beginning
+     * 
+     * ***********************************************************/
+    snprintf(fifoname, 80, "/tmp/fortune.%d", getpid());
+    if (mkfifo(fifoname, 0622)) {
+       if (errno!=EEXIST) {
+           perror("Cannot create well known fifo");
+           exit(-1);
+       }
+    }
+    fifo_server = open(fortunefilename, O_WRONLY);
+    if (fifo_server < 0) {
+       perror("Cannot open well known fifo");
+       exit(-1);
+    }
+    debug("%s\n", fifoname);
+    nread = write(fifo_server, fifoname, strlen(fifoname)+1);
+    close(fifo_server);
+    fifo_client = open(fifoname, O_RDONLY);
+    if (fifo_client < 0) {
+       perror("Cannot open well known fifo");
+       exit(-1);
+    }
+    nread = read(fifo_client, buffer, sizeof(buffer));
+    printf("%s", buffer);
+    close(fifo_client);
+    close(fifo_server);
+    unlink(fifoname);
+}
+/*
+ * routine to print usage info and exit
+ */
+void usage(void) {
+    printf("Elementary fortune server\n");
+    printf("Usage:\n");
+    printf("  fortune [-h] [-f] \n");
+    printf("  -h   print this help\n");
+    printf("  -f filename   set file for fortunes\n");
+    exit(1);
+}