Finita fork, inizio terminazione e wait

[gapil.git] / sources / ForkTest.c

diff --git a/sources/ForkTest.c b/sources/ForkTest.c
index da38629b41892b6be703821222303d4da4073576..d57ef7a7436c469f0620ce45c3dfee50d9d31fe1 100644 (file)
--- a/sources/ForkTest.c
+++ b/sources/ForkTest.c
@@ -1,3 +1,21 @@
+/* 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: 
@@ -8,7 +26,7 @@
  *
  * Usage: forktest -h give all info's
  *
- * $Id: ForkTest.c,v 1.1 2001/09/09 17:39:15 piccardi Exp $
+ * $Id: ForkTest.c,v 1.4 2001/09/14 22:16:41 piccardi Exp $
  *
  ****************************************************************/
 /* 
@@ -28,23 +46,30 @@ int main(int argc, char *argv[])
 /* 
  * Variables definition  
  */
-    int i;
-    int nchild;
+    int nchild, i;
     pid_t pid;
+    int wait_child=0;
+    int wait_parent=0;
     /*
      * Input section: decode command line parameters 
      * Use getopt function
      */
     opterr = 0;         /* don't want writing to stderr */
-    while ( (i = getopt(argc, argv, "h")) != -1) {
+    while ( (i = getopt(argc, argv, "hp:c:")) != -1) {
        switch (i) {
        /* 
         * Handling options 
         */ 
-       case 'h':  
+       case 'h':   /* help option */
            printf("Wrong -h option use\n");
            usage();
-           return(0);
+           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 '?':   /* unrecognized options */
            printf("Unrecognized options -%c\n",optopt);
@@ -68,16 +93,20 @@ int main(int argc, char *argv[])
     printf("Test for forking %d child\n", nchild);
     /* loop to fork children */
     for (i=0; i<nchild; i++) {
-       if ( (pid = fork()) < 0) {
-           printf("Error on %d child creation, %s\n", i, strerror(errno));
+       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++);
-           sleep(2);
+           printf("Child %d successfully executing\n", ++i);
+           if (wait_child) sleep(wait_child);
            printf("Child %d exiting\n", i);
            exit(0);
        } else {          /* parent */
-           printf("Spawned %d child, pid %d \n", i, pid);
+           printf("Spawned %d child, pid %d \n", i+1, pid);
+           if (wait_parent) sleep(wait_parent);
+           printf("Go to next child \n");
        }
     }
     /* normal exit */