+/* 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:
*
* 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 1.7 2002/08/18 23:24:44 piccardi Exp $
*
****************************************************************/
/*
#include <stdio.h> /* standard I/O library */
#include <string.h> /* string functions */
+#include "wrappers.h"
+#include "macros.h"
+
/* Help printing routine */
void usage(void);
/*
* 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, "hsp: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 's':
+ Signal(SIGCHLD, HandSIGCHLD);
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) {
- 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 exiting\n", i);
+ 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, 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 */
+ 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(" -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);
}