path: root/samples
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authorGuenter Roeck <>2019-05-30 04:40:47 -0700
committerChristian Brauner <>2019-06-05 15:06:07 +0200
commit7c33277b9a9ada187f805b41ffbebe6c51622fb6 (patch)
tree8c34fbee42a6e803bc4d96f91ed20dbacf5229c7 /samples
parentf2c7c76c5d0a443053e94adb9f0918fa2fb85c3a (diff)
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: 43c6afee48d4 ("samples: show race-free pidfd metadata access") Reported-by: Arnd Bergmann <> Reported-by: Guenter Roeck <> Cc: Christian Brauner <> Signed-off-by: Guenter Roeck <> [ tweak commit message] Signed-off-by: Christian Brauner <>
Diffstat (limited to 'samples')
1 files changed, 4 insertions, 0 deletions
diff --git a/samples/pidfd/pidfd-metadata.c b/samples/pidfd/pidfd-metadata.c
index 640f5f757c57..14b454448429 100644
--- a/samples/pidfd/pidfd-metadata.c
+++ b/samples/pidfd/pidfd-metadata.c
@@ -21,6 +21,10 @@
#define CLONE_PIDFD 0x00001000
+#ifndef __NR_pidfd_send_signal
+#define __NR_pidfd_send_signal -1
static int do_child(void *args)
printf("%d\n", getpid());