freebsd-dev/contrib/capsicum-test/waittest.c

43 lines
1.0 KiB
C
Raw Normal View History

#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#ifdef __FreeBSD__
#include <sys/procdesc.h>
#endif
#ifdef __linux__
#include <sys/syscall.h>
int pdfork(int *fd, int flags) {
return syscall(__NR_pdfork, fd, flags);
}
#endif
int main() {
int procfd;
int rc = pdfork(&procfd, 0);
if (rc < 0) {
fprintf(stderr, "pdfork() failed rc=%d errno=%d %s\n", rc, errno, strerror(errno));
exit(1);
}
if (rc == 0) { // Child process
sleep(1);
exit(123);
}
fprintf(stderr, "pdfork()ed child pid=%ld procfd=%d\n", (long)rc, procfd);
sleep(2); // Allow child to complete
pid_t child = waitpid(-1, &rc, WNOHANG);
if (child == 0) {
fprintf(stderr, "waitpid(): no completed child found\n");
} else if (child < 0) {
fprintf(stderr, "waitpid(): failed errno=%d %s\n", errno, strerror(errno));
} else {
fprintf(stderr, "waitpid(): found completed child %ld\n", (long)child);
}
return 0;
}