pidfds: don't print a scary warning on ENOSYS

Most kernels don't have this functionality yet, and so the warning is printed a lot. Our people are scared of warnings, so let's make it INFO instead in this case. Signed-off-by: Tycho Andersen <tycho@tycho.ws>

pidfds: don't print a scary warning on ENOSYS
f452e523 · Tycho Andersen · Christian Brauner · cf61d25e · f452e523
Unverified Commit f452e523 authored Jul 23, 2019 by Tycho Andersen Committed by Christian Brauner Aug 11, 2019
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start.c src/lxc/start.c +4 -1

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--- a/src/lxc/start.c
+++ b/src/lxc/start.c
@@ -1605,7 +1605,10 @@ static int proc_pidfd_open(pid_t pid)
 	/* Test whether we can send signals. */
 	if (lxc_raw_pidfd_send_signal(proc_pidfd, 0, NULL, 0)) {
-		SYSERROR("Failed to send signal through pidfd");
+		if (errno != ENOSYS)
+			SYSERROR("Failed to send signal through pidfd");
+		else
+			INFO("Sending signals through pidfds not supported on this kernel");
 		return -1;
 	}