[newlib-cygwin] unix(4): Enhance LOCAL_CREDS_PERSISTENT ABI

[Sebastian Huber <sh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=3f7425e8bb5abcb5c10ecc72acee0007f55a7957

commit 3f7425e8bb5abcb5c10ecc72acee0007f55a7957
Author: Conrad Meyer <cem@FreeBSD.org>
Date:   Tue Nov 17 20:01:21 2020 +0000

    unix(4): Enhance LOCAL_CREDS_PERSISTENT ABI
    
    As this ABI is still fresh (r367287), let's correct some mistakes now:
    
    - Version the structure to allow for future changes
    - Include sender's pid in control message structure
    - Use a distinct control message type from the cmsgcred / sockcred mess
    
    Discussed with: kib, markj, trasz
    Differential Revision:  https://reviews.freebsd.org/D27084

Diff:
---
 newlib/libc/sys/rtems/include/sys/socket.h | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/newlib/libc/sys/rtems/include/sys/socket.h b/newlib/libc/sys/rtems/include/sys/socket.h
index 0be6879de..4079b3e91 100644
--- a/newlib/libc/sys/rtems/include/sys/socket.h
+++ b/newlib/libc/sys/rtems/include/sys/socket.h
@@ -495,7 +495,7 @@ struct cmsgcred {
 };
 
 /*
- * Socket credentials.
+ * Socket credentials (LOCAL_CREDS).
  */
 struct sockcred {
 	uid_t	sc_uid;			/* real user id */
@@ -512,6 +512,22 @@ struct sockcred {
 #define	SOCKCREDSIZE(ngrps) \
 	(sizeof(struct sockcred) + (sizeof(gid_t) * ((ngrps) - 1)))
 
+/*
+ * Socket credentials (LOCAL_CREDS_PERSISTENT).
+ */
+struct sockcred2 {
+	int	sc_version;		/* version of this structure */
+	pid_t	sc_pid;			/* PID of sending process */
+	uid_t	sc_uid;			/* real user id */
+	uid_t	sc_euid;		/* effective user id */
+	gid_t	sc_gid;			/* real group id */
+	gid_t	sc_egid;		/* effective group id */
+	int	sc_ngroups;		/* number of supplemental groups */
+	gid_t	sc_groups[1];		/* variable length */
+};
+#define	SOCKCRED2SIZE(ngrps) \
+	(sizeof(struct sockcred2) + (sizeof(gid_t) * ((ngrps) - 1)))
+
 #endif /* __BSD_VISIBLE */
 
 /* given pointer to struct cmsghdr, return pointer to data */
@@ -552,6 +568,7 @@ struct sockcred {
 #define	SCM_REALTIME	0x05		/* timestamp (struct timespec) */
 #define	SCM_MONOTONIC	0x06		/* timestamp (struct timespec) */
 #define	SCM_TIME_INFO	0x07		/* timestamp info */
+#define	SCM_CREDS2	0x08		/* process creds (struct sockcred2) */
 
 struct sock_timestamp_info {
 	__uint32_t	st_info_flags;