Last change
on this file since 202 was 2, checked in by Rick van der Zwet, 15 years ago |
Initial import of data of old repository ('data') worth keeping (e.g. tracking
means of URL access statistics)
|
File size:
1.1 KB
|
Rev | Line | |
---|
[2] | 1 | /* a simple parent; version1; sys name: parent1.c
|
---|
| 2 | Now we better create a program, which will replace the replica
|
---|
| 3 | of the parent. We have named this replacing program child1.c
|
---|
| 4 | and have made an executable out of it carrying the name child1
|
---|
| 5 | (use the -o option). In parent process fork() returns the pid
|
---|
| 6 | of the child; in the child process fork returns 0. */
|
---|
| 7 | #include <sys/wait.h>
|
---|
| 8 | #define NULL 0
|
---|
| 9 | #include <stdio.h>
|
---|
| 10 | #include <unistd.h>
|
---|
| 11 | #include <stdlib.h>
|
---|
| 12 |
|
---|
| 13 | int main(void)
|
---|
| 14 | {
|
---|
| 15 | int pidValue = fork();
|
---|
| 16 | if (pidValue > 0) {
|
---|
| 17 | /* Parent code here */
|
---|
| 18 | printf("Process[%d]: Parent in execution ... \n", getpid());
|
---|
| 19 | sleep(2);
|
---|
| 20 | if (wait(NULL) > 0) { /* Child terminating */
|
---|
| 21 | printf("Process[%d]: Parent detects terminating child \n", getpid());
|
---|
| 22 | }
|
---|
| 23 | printf("Process[%d]: Parent terminating ... \n", getpid());
|
---|
| 24 | }
|
---|
| 25 | else {
|
---|
| 26 | if (pidValue == 0) {
|
---|
| 27 | /* this is the child's process */
|
---|
| 28 | execve("child1", NULL, NULL);
|
---|
| 29 | exit(0); /* should never get here, terminate */
|
---|
| 30 | }
|
---|
| 31 | else {
|
---|
| 32 | /* should never get here; things such as not
|
---|
| 33 | enought mem */
|
---|
| 34 | exit(0);
|
---|
| 35 | }
|
---|
| 36 | }
|
---|
| 37 | return(0);
|
---|
| 38 | }
|
---|
Note:
See
TracBrowser
for help on using the repository browser.