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[gapil.git] / sources / ForkTest.c

diff --git a/sources/ForkTest.c b/sources/ForkTest.c
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+/* ForkTest.c
+ * 
+ * Copyright (C) 2001 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 ForkTest.c: 
+ * Program to test process creation
+ *
+ * Author: Simone Piccardi
+ * Sep. 2001
+ *
+ * Usage: forktest -h give all info's
+ *
+ * $Id: ForkTest.c,v 1.10 2003/05/02 09:55:13 piccardi Exp $
+ *
+ ****************************************************************/
+/* 
+ * Include needed headers
+ */
+#include <errno.h>       /* error definitions and routines */ 
+#include <stdlib.h>      /* C standard library */
+#include <unistd.h>      /* unix standard library */
+#include <stdio.h>      /* standard I/O library */
+#include <string.h>      /* string functions */
+
+#include "Gapil.h"
+#include "macros.h"
+
+/* Help printing routine */
+void usage(void);
+
+int main(int argc, char *argv[])
+{
+/* 
+ * Variables definition  
+ */
+    int nchild, i;
+    pid_t pid;
+    int wait_child  = 0;
+    int wait_parent = 0;
+    int wait_end    = 0;
+    /*
+     * Input section: decode command line parameters 
+     * Use getopt function
+     */
+    opterr = 0;         /* don't want writing to stderr */
+    while ( (i = getopt(argc, argv, "hsp:c:e:")) != -1) {
+       switch (i) {
+       /* 
+        * Handling options 
+        */ 
+       case 'h':   /* help option */
+           printf("Wrong -h option use\n");
+           usage();
+           return -1;
+           break;
+       case 'c':   /* take wait time for childen */
+           wait_child = strtol(optarg, NULL, 10);    /* convert input */
+           break;
+       case 'p':   /* take wait time for childen */
+           wait_parent = strtol(optarg, NULL, 10);   /* convert input */
+           break;
+       case 'e':   /* take wait before parent exit */
+           wait_end = strtol(optarg, NULL, 10);      /* convert input */
+           break;
+       case 's':
+           Signal(SIGCHLD, HandSigCHLD);
+           break;
+       case '?':   /* unrecognized options */
+           printf("Unrecognized options -%c\n",optopt);
+           usage();
+       default:    /* should not reached */
+           usage();
+       }
+    }
+    /* ***********************************************************
+     * 
+     *          Options processing completed
+     *
+     *               Main code beginning
+     * 
+     * ***********************************************************/
+    /* There must be remaing parameters */
+    if (optind == argc) {
+       usage();
+    }
+    nchild = atoi(argv[optind]);
+    printf("Process %d: forking %d child\n", getpid(), nchild);
+    /* loop to fork children */
+    for (i=0; i<nchild; i++) {
+       if ( (pid = fork()) < 0) { 
+           /* on error exit */ 
+           printf("Error on %d child creation, %s\n", i+1, strerror(errno));
+           exit(-1); 
+       }
+       if (pid == 0) {   /* child */
+           printf("Child %d successfully executing\n", ++i);
+           if (wait_child) sleep(wait_child);
+           printf("Child %d, parent %d, exiting\n", i, getppid());
+           exit(0);
+       } else {          /* parent */
+           printf("Spawned %d child, pid %d \n", i+1, pid);
+           if (wait_parent) sleep(wait_parent);
+           printf("Go to next child \n");
+       }
+    }
+    /* normal exit */
+    if (wait_end) sleep(wait_end);
+    return 0;
+}
+/*
+ * routine to print usage info and exit
+ */
+void usage(void) {
+    printf("Program forktest: fork a given number of child \n");
+    printf("Usage:\n");
+    printf("  forktest [-h] [-p sec] [-c sec] [-e sec] child to fork \n");
+    printf("  -h          print this help\n");
+    printf("  -s          install signal handler\n");
+    printf("  -p sec       wait sec seconds before next fork\n");
+    printf("  -c sec       wait sec seconds before child termination\n");
+    printf("  -e sec       wait sec seconds before parent return\n");
+    
+    exit(1);
+}