[newlib-cygwin] Fix a problem that connection to syslogd fails.

[Corinna Vinschen <corinna at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=8e782bbd9499356aa33667e19cb17ab2e6f39ce4

commit 8e782bbd9499356aa33667e19cb17ab2e6f39ce4
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Thu Jul 5 23:46:34 2018 +0900

    Fix a problem that connection to syslogd fails.
    
    * fhandler_socket_local.cc (get_inet_addr_local): Change type from
      'static int' to 'int' to be callable from syslog.cc.
    * syslog.cc (connect_syslogd): Use get_inet_addr_local() instead of
      getsockname() to retrieve name information of the syslogd socket.

Diff:
---
 winsup/cygwin/fhandler_socket_local.cc |  2 +-
 winsup/cygwin/syslog.cc                | 34 ++++++++++++++++------------------
 2 files changed, 17 insertions(+), 19 deletions(-)

diff --git a/winsup/cygwin/fhandler_socket_local.cc b/winsup/cygwin/fhandler_socket_local.cc
index 2705ecd..bffb112 100644
--- a/winsup/cygwin/fhandler_socket_local.cc
+++ b/winsup/cygwin/fhandler_socket_local.cc
@@ -68,7 +68,7 @@ adjust_socket_file_mode (mode_t mode)
 }
 
 /* cygwin internal: map sockaddr into internet domain address */
-static int
+int
 get_inet_addr_local (const struct sockaddr *in, int inlen,
 	       struct sockaddr_storage *out, int *outlen,
 	       int *type = NULL, int *secret = NULL)
diff --git a/winsup/cygwin/syslog.cc b/winsup/cygwin/syslog.cc
index 36633a4..6a29550 100644
--- a/winsup/cygwin/syslog.cc
+++ b/winsup/cygwin/syslog.cc
@@ -186,12 +186,17 @@ static enum {
 static int syslogd_sock = -1;
 extern "C" int cygwin_socket (int, int, int);
 extern "C" int cygwin_connect (int, const struct sockaddr *, int);
+extern int get_inet_addr_local (const struct sockaddr *, int,
+			  struct sockaddr_storage *, int *,
+			  int * = NULL, int * = NULL);
 
 static void
 connect_syslogd ()
 {
   int fd;
   struct sockaddr_un sun;
+  struct sockaddr_storage sst;
+  int len, type;
 
   if (syslogd_inited != not_inited && syslogd_sock >= 0)
     close (syslogd_sock);
@@ -199,16 +204,14 @@ connect_syslogd ()
   syslogd_sock = -1;
   sun.sun_family = AF_LOCAL;
   strncpy (sun.sun_path, _PATH_LOG, sizeof sun.sun_path);
-  if ((fd = cygwin_socket (AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
+  if (get_inet_addr_local ((struct sockaddr *) &sun, sizeof sun,
+			   &sst, &len, &type))
+    return;
+  if ((fd = cygwin_socket (AF_LOCAL, type | SOCK_CLOEXEC, 0)) < 0)
     return;
   if (cygwin_connect (fd, (struct sockaddr *) &sun, sizeof sun) == 0)
-    syslogd_inited = inited_stream;
-  else
     {
-      close (fd);
-      if ((fd = cygwin_socket (AF_LOCAL, SOCK_DGRAM | SOCK_CLOEXEC, 0)) < 0)
-	return;
-      if (cygwin_connect (fd, (struct sockaddr *) &sun, sizeof sun) == 0)
+      if (type == SOCK_DGRAM)
 	{
 	  /*
 	   * FIXME
@@ -219,18 +222,10 @@ connect_syslogd ()
 
 	  /* connect on a dgram socket always succeeds.  We still don't know
 	     if syslogd is actually listening. */
-	  cygheap_fdget cfd (fd);
-	  fhandler_socket_local *const fh = (fhandler_socket_local *)
-					    cfd->is_socket ();
 	  tmp_pathbuf tp;
 	  PMIB_UDPTABLE tab = (PMIB_UDPTABLE) tp.w_get ();
 	  DWORD size = 65536;
 	  bool found = false;
-	  struct sockaddr_storage sst;
-	  int len;
-
-	  len = sizeof sst;
-	  ::getsockname (fh->get_socket (), (struct sockaddr *) &sst, &len);
 	  struct sockaddr_in *sa = (struct sockaddr_in *) &sst;
 
 	  if (GetUdpTable (tab, &size, FALSE) == NO_ERROR)
@@ -249,10 +244,13 @@ connect_syslogd ()
 		  return;
 		}
 	    }
-	  syslogd_inited = inited_dgram;
 	}
-      else
-	close (fd);
+      syslogd_inited = type == SOCK_DGRAM ? inited_dgram : inited_stream;
+    }
+  else
+    {
+      close (fd);
+      return;
     }
   syslogd_sock = fd;
   debug_printf ("found /dev/log, fd = %d, type = %s",