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