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 ****************************************************************/
31 * Include needed headers
33 #include <errno.h> /* error definitions and routines */
34 #include <stdlib.h> /* C standard library */
35 #include <unistd.h> /* unix standard library */
36 #include <stdio.h> /* standard I/O library */
37 #include <string.h> /* C strings library */
42 /* Help printing routine */
45 int main(int argc, char *argv[])
48 * Variables definition
56 * Input section: decode command line parameters
59 opterr = 0; /* don't want writing to stderr */
60 while ( (i = getopt(argc, argv, "hsp:c:e:")) != -1) {
65 case 'h': /* help option */
66 printf("Wrong -h option use\n");
70 case 'c': /* take wait time for childen */
71 wait_child = strtol(optarg, NULL, 10); /* convert input */
73 case 'p': /* take wait time for childen */
74 wait_parent = strtol(optarg, NULL, 10); /* convert input */
76 case 'e': /* take wait before parent exit */
77 wait_end = strtol(optarg, NULL, 10); /* convert input */
80 Signal(SIGCHLD, HandSigCHLD);
82 case '?': /* unrecognized options */
83 printf("Unrecognized options -%c\n",optopt);
85 default: /* should not reached */
89 /* ***********************************************************
91 * Options processing completed
95 * ***********************************************************/
96 /* There must be remaing parameters */
100 nchild = atoi(argv[optind]);
101 printf("Process %d: forking %d child\n", getpid(), nchild);
102 /* loop to fork children */
103 for (i=0; i<nchild; i++) {
104 if ( (pid = fork()) < 0) {
106 printf("Error on %d child creation, %s\n", i+1, strerror(errno));
109 if (pid == 0) { /* child */
110 printf("Child %d successfully executing\n", ++i);
111 if (wait_child) sleep(wait_child);
112 printf("Child %d, parent %d, exiting\n", i, getppid());
114 } else { /* parent */
115 printf("Spawned %d child, pid %d \n", i+1, pid);
116 if (wait_parent) sleep(wait_parent);
117 printf("Go to next child \n");
121 if (wait_end) sleep(wait_end);
125 * routine to print usage info and exit
128 printf("Program forktest: fork a given number of child \n");
130 printf(" forktest [-h] [-p sec] [-c sec] [-e sec] child to fork \n");
131 printf(" -h print this help\n");
132 printf(" -s install signal handler\n");
133 printf(" -p sec wait sec seconds before next fork\n");
134 printf(" -c sec wait sec seconds before child termination\n");
135 printf(" -e sec wait sec seconds before parent return\n");