1 #include <errno.h>
2 #include <string.h>
3 #include <stdlib.h>
4 #include <stdio.h>
5 #include <unistd.h>
6 #include <sys/types.h>
7 #include <sys/wait.h>
8
9 #include <sys/procdesc.h>
10
main()11 int main() {
12 int procfd;
13 int rc = pdfork(&procfd, 0);
14 if (rc < 0) {
15 fprintf(stderr, "pdfork() failed rc=%d errno=%d %s\n", rc, errno, strerror(errno));
16 exit(1);
17 }
18 if (rc == 0) { // Child process
19 sleep(1);
20 exit(123);
21 }
22 fprintf(stderr, "pdfork()ed child pid=%ld procfd=%d\n", (long)rc, procfd);
23 sleep(2); // Allow child to complete
24 pid_t child = waitpid(-1, &rc, WNOHANG);
25 if (child == 0) {
26 fprintf(stderr, "waitpid(): no completed child found\n");
27 } else if (child < 0) {
28 fprintf(stderr, "waitpid(): failed errno=%d %s\n", errno, strerror(errno));
29 } else {
30 fprintf(stderr, "waitpid(): found completed child %ld\n", (long)child);
31 }
32 return 0;
33 }
34