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| author | Ingo Molnar <mingo@kernel.org> | 2019-07-08 18:04:41 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-07-08 18:04:41 +0200 |
| commit | 552a031ba12a4236be107a5b082a399237758a5d (patch) | |
| tree | a2bcdeb651b360013dbb654bbcd61dbaf51e0331 /samples/pidfd/pidfd-metadata.c | |
| parent | Merge branch 'x86/cpu' into perf/core, to pick up revert (diff) | |
| parent | Linux 5.2 (diff) | |
| download | linux-552a031ba12a4236be107a5b082a399237758a5d.tar.xz linux-552a031ba12a4236be107a5b082a399237758a5d.zip | |
Merge tag 'v5.2' into perf/core, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'samples/pidfd/pidfd-metadata.c')
| -rw-r--r-- | samples/pidfd/pidfd-metadata.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/samples/pidfd/pidfd-metadata.c b/samples/pidfd/pidfd-metadata.c index 14b454448429..c459155daf9a 100644 --- a/samples/pidfd/pidfd-metadata.c +++ b/samples/pidfd/pidfd-metadata.c @@ -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); |