3 * Copyright (C) 2001 Simone Piccardi
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 /****************************************************************
22 * Program to test process creation
24 * Author: Simone Piccardi
27 * Usage: forktest -h give all info's
29 * $Id: ForkTest.c,v 1.4 2001/09/14 22:16:41 piccardi Exp $
31 ****************************************************************/
33 * Include needed headers
35 #include <errno.h> /* error definitions and routines */
36 #include <stdlib.h> /* C standard library */
37 #include <unistd.h> /* unix standard library */
38 #include <stdio.h> /* standard I/O library */
39 #include <string.h> /* string functions */
41 /* Help printing routine */
44 int main(int argc, char *argv[])
47 * Variables definition
54 * Input section: decode command line parameters
57 opterr = 0; /* don't want writing to stderr */
58 while ( (i = getopt(argc, argv, "hp:c:")) != -1) {
63 case 'h': /* help option */
64 printf("Wrong -h option use\n");
68 case 'c': /* take wait time for childen */
69 wait_child=strtol(optarg, NULL, 10); /* convert input */
71 case 'p': /* take wait time for childen */
72 wait_parent=strtol(optarg, NULL, 10); /* convert input */
74 case '?': /* unrecognized options */
75 printf("Unrecognized options -%c\n",optopt);
77 default: /* should not reached */
81 /* ***********************************************************
83 * Options processing completed
87 * ***********************************************************/
88 /* There must be remaing parameters */
92 nchild = atoi(argv[optind]);
93 printf("Test for forking %d child\n", nchild);
94 /* loop to fork children */
95 for (i=0; i<nchild; i++) {
96 if ( (pid = fork()) < 0) {
98 printf("Error on %d child creation, %s\n", i+1, strerror(errno));
101 if (pid == 0) { /* child */
102 printf("Child %d successfully executing\n", ++i);
103 if (wait_child) sleep(wait_child);
104 printf("Child %d exiting\n", i);
106 } else { /* parent */
107 printf("Spawned %d child, pid %d \n", i+1, pid);
108 if (wait_parent) sleep(wait_parent);
109 printf("Go to next child \n");
116 * routine to print usage info and exit
119 printf("Program forktest: fork a given number of child \n");
121 printf(" forktest [-h] child to fork \n");
122 printf(" -h print this help\n");