*
* Usage: forktest -h give all info's
*
- * $Id: ForkTest.c,v 1.2 2001/09/09 22:45:34 piccardi Exp $
+ * $Id: ForkTest.c,v 1.6 2001/09/21 17:10:51 piccardi Exp $
*
****************************************************************/
/*
/*
* Variables definition
*/
- int i;
- int nchild;
+ 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, "h")) != -1) {
+ while ( (i = getopt(argc, argv, "hp:c:e:")) != -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 'e': /* take wait before parent exit */
+ wait_end = strtol(optarg, NULL, 10); /* convert input */
break;
case '?': /* unrecognized options */
printf("Unrecognized options -%c\n",optopt);
usage();
}
nchild = atoi(argv[optind]);
- printf("Test for forking %d child\n", nchild);
+ printf("Process %d: forking %d child\n", getpid(), nchild);
/* loop to fork children */
for (i=0; i<nchild; i++) {
- if ( (pid = fork()) < 0) {
+ 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 exiting\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;
}
/*
void usage(void) {
printf("Program forktest: fork a given number of child \n");
printf("Usage:\n");
- printf(" forktest [-h] child to fork \n");
+ printf(" forktest [-h] [-p sec] [-c sec] [-e sec] child to fork \n");
printf(" -h print this help\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);
}