[glibc] linux: Add P_PIDFD

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b3528b0048f24e1f3019860c951f17f09e54ff8b

commit b3528b0048f24e1f3019860c951f17f09e54ff8b
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Fri Jan 28 17:38:38 2022 -0300

    linux: Add P_PIDFD
    
    It was added on Linux 5.4 (3695eae5fee0605f316fbaad0b9e3de791d7dfaf)
    to extend waitid to wait on pidfd.
    
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>
    Tested-by: Carlos O'Donell <carlos@redhat.com>

Diff:
---
 posix/Makefile                                |  2 +-
 posix/sys/wait.h                              |  7 +------
 sysdeps/mach/hurd/bits/types/idtype_t.h       | 12 ++++++++++++
 sysdeps/unix/sysv/linux/bits/types/idtype_t.h | 14 ++++++++++++++
 4 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/posix/Makefile b/posix/Makefile
index 9b30b53a7c..cfebb8ef06 100644
--- a/posix/Makefile
+++ b/posix/Makefile
@@ -32,7 +32,7 @@ headers	:= sys/utsname.h sys/times.h sys/wait.h sys/types.h unistd.h	      \
 	   bits/waitflags.h bits/waitstatus.h sys/unistd.h sched.h	      \
 	   bits/sched.h bits/cpu-set.h re_comp.h wait.h bits/environments.h   \
 	   cpio.h spawn.h bits/unistd.h bits/types/struct_sched_param.h	      \
-	   bits/unistd_ext.h
+	   bits/unistd_ext.h bits/types/idtype_t.h
 
 routines :=								      \
 	uname								      \
diff --git a/posix/sys/wait.h b/posix/sys/wait.h
index 79bcdb013d..4d649cd4b1 100644
--- a/posix/sys/wait.h
+++ b/posix/sys/wait.h
@@ -71,12 +71,7 @@ typedef __pid_t pid_t;
 
 /* The following values are used by the `waitid' function.  */
 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
-typedef enum
-{
-  P_ALL,		/* Wait for any child.  */
-  P_PID,		/* Wait for specified process.  */
-  P_PGID		/* Wait for members of process group.  */
-} idtype_t;
+# include <bits/types/idtype_t.h>
 #endif
 
 
diff --git a/sysdeps/mach/hurd/bits/types/idtype_t.h b/sysdeps/mach/hurd/bits/types/idtype_t.h
new file mode 100644
index 0000000000..207eb777ba
--- /dev/null
+++ b/sysdeps/mach/hurd/bits/types/idtype_t.h
@@ -0,0 +1,12 @@
+#ifndef __idtype_t_defined
+#define __idtype_t_defined
+
+/* The following values are used by the `waitid' function.  */
+typedef enum
+{
+  P_ALL,		/* Wait for any child.  */
+  P_PID,		/* Wait for specified process.  */
+  P_PGID,		/* Wait for members of process group.  */
+} idtype_t;
+
+#endif
diff --git a/sysdeps/unix/sysv/linux/bits/types/idtype_t.h b/sysdeps/unix/sysv/linux/bits/types/idtype_t.h
new file mode 100644
index 0000000000..fc084c7774
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/bits/types/idtype_t.h
@@ -0,0 +1,14 @@
+#ifndef __idtype_t_defined
+#define __idtype_t_defined
+
+/* The following values are used by the `waitid' function.  */
+typedef enum
+{
+  P_ALL,		/* Wait for any child.  */
+  P_PID,		/* Wait for specified process.  */
+  P_PGID,		/* Wait for members of process group.  */
+  P_PIDFD,		/* Wait for the child referred by the PID file
+			   descriptor.  */
+} idtype_t;
+
+#endif