* cygwin.din (getpeereid): Export.

	* fhandler.h (class fhandler_socket): Add pipe and id members to
	exchange eid credentials for AF_LOCAL sockets.
	(eid_pipe_name): Declare new method.
	(getpeereid): Ditto.
	* fhandler_socket.cc (fhandler_socket::eid_pipe_name): New method.
	(fhandler_socket::fhandler_socket): Initialize sec_pipe.
	(fhandler_socket::connect): Exchange eid credentials with accepting
	socket process.
	(fhandler_socket::listen): Prepare eid credential transaction.
	(fhandler_socket::accept): Exchange eid credentials with connecting
	socket process.
	(fhandler_socket::close): Close eid credentials pipe if open.
	(fhandler_socket::getpeereid): New method.
	* net.cc (cygwin_getsockopt): Add SO_PEERCRED handling.
	(getpeereid): New function.
	* include/asm/socket.h (SO_PEERCRED): Define.
	* include/cygwin/socket.h (struct ucred): Define new type.
	* include/cygwin/version.h: Bump API minor version.

1 files changed, 17 insertions, 0 deletions

diff --git a/winsup/cygwin/net.cc b/winsup/cygwin/net.cc
index 33356d13e..98e121c5a 100644
--- a/winsup/cygwin/net.cc
+++ b/winsup/cygwin/net.cc
@@ -780,6 +780,8 @@ cygwin_getsockopt (int fd, int level, int optname, void *optval, int *optlen)
       case SO_ERROR:
 	name = "SO_ERROR";
 	break;
+      case SO_PEERCRED:
+        name = "SO_PEERCRED";
     }
 
   if ((optval
@@ -787,6 +789,11 @@ cygwin_getsockopt (int fd, int level, int optname, void *optval, int *optlen)
 	   || __check_null_invalid_struct_errno (optval, (unsigned) *optlen)))
       || !fh)
     res = -1;
+  else if (optname == SO_PEERCRED)
+    {
+      struct ucred *cred = (struct ucred *) optval;
+      res = fh->getpeereid (&cred->pid, &cred->uid, &cred->gid);
+    }
   else
     {
       res = getsockopt (fh->get_socket (), level, optname, (char *) optval,
@@ -808,6 +815,16 @@ cygwin_getsockopt (int fd, int level, int optname, void *optval, int *optlen)
   return res;
 }
 
+extern "C" int
+getpeereid (int fd, __uid32_t *euid, __gid32_t *egid)
+{
+  sig_dispatch_pending ();
+  fhandler_socket *fh = get (fd);
+  if (fh)
+    return fh->getpeereid (NULL, euid, egid);
+  return -1;
+}
+
 /* exported as connect: standards? */
 extern "C" int
 cygwin_connect (int fd, const struct sockaddr *name, int namelen)