sys/wait.h: add P_PIDFD from linux v5.4

allows waiting on a pidfd, in the future it might allow retrieving the
exit status by a non-parent process, see

  linux commit 3695eae5fee0605f316fbaad0b9e3de791d7dfaf
  pidfd: add P_PIDFD to waitid()

diff --git a/include/sys/wait.h b/include/sys/wait.h
index d9adbde..d4b1f2e 100644 (file)
--- a/include/sys/wait.h
+++ b/include/sys/wait.h
@@ -13,7 +13,8 @@ extern "C" {
 typedef enum {
        P_ALL = 0,
        P_PID = 1,
-       P_PGID = 2
+       P_PGID = 2,
+       P_PIDFD = 3
 } idtype_t;
 
 pid_t wait (int *);