Unverified Commit 7c33277b authored May 30, 2019 by Guenter Roeck Committed by Christian Brauner Jun 05, 2019

samples: fix pidfd-metadata compilation



Define __NR_pidfd_send_signal if it isn't to prevent a compilation error.

To make pidfd-metadata compile on all arches, irrespective of whether
or not syscall numbers are assigned, define the syscall number to -1.
If it isn't defined this will cause the kernel to return -ENOSYS.

Fixes: 43c6afee ("samples: show race-free pidfd metadata access")
Reported-by: Arnd Bergmann <arnd@arndb.de>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Cc: Christian Brauner <christian@brauner.io>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
[christian@brauner.io: tweak commit message]
Signed-off-by: Christian Brauner <christian@brauner.io>

parent f2c7c76c

samples/pidfd/pidfd-metadata.c

+4 −0

Original line number	Original line	Diff line number	Diff line
	@@ -21,6 +21,10 @@
	#define CLONE_PIDFD 0x00001000		#define CLONE_PIDFD 0x00001000
	#endif		#endif

			#ifndef __NR_pidfd_send_signal
			#define __NR_pidfd_send_signal -1
			#endif

	static int do_child(void *args)		static int do_child(void *args)
	{		{
	printf("%d\n", getpid());		printf("%d\n", getpid());

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