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Unverified Commit bee19cd8 authored by Dmitry V. Levin's avatar Dmitry V. Levin Committed by Christian Brauner
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samples: make pidfd-metadata fail gracefully on older kernels 



Initialize pidfd to an invalid descriptor, to fail gracefully on
those kernels that do not implement CLONE_PIDFD and leave pidfd
unchanged.

Signed-off-by: default avatarDmitry V. Levin <ldv@altlinux.org>
Signed-off-by: default avatarChristian Brauner <christian@brauner.io>
parent 9014143b

samples/pidfd/pidfd-metadata.c

+6 −2
Original line number Diff line number Diff line
@@ -83,7 +83,7 @@ static int pidfd_metadata_fd(pid_t pid, int pidfd) 


int main(int argc, char *argv[])

{

	int pidfd = 0, ret = EXIT_FAILURE;

	int pidfd = -1, ret = EXIT_FAILURE;

	char buf[4096] = { 0 };

	pid_t pid;

	int procfd, statusfd;
@@ -91,7 +91,11 @@ int main(int argc, char *argv[]) 


	pid = pidfd_clone(CLONE_PIDFD, &pidfd);

	if (pid < 0)

		exit(ret);

		err(ret, "CLONE_PIDFD");

	if (pidfd == -1) {

		warnx("CLONE_PIDFD is not supported by the kernel");

		goto out;

	}



	procfd = pidfd_metadata_fd(pid, pidfd);

	close(pidfd);