dovecot-1.1: Some versions of Mac OS X have buggy CMSG_* macros,...

[dovecot at dovecot.org]

details:   http://hg.dovecot.org/dovecot-1.1/rev/a217d9ae130b
changeset: 8059:a217d9ae130b
user:      Timo Sirainen <tss at iki.fi>
date:      Fri Dec 19 10:02:49 2008 +0200
description:
Some versions of Mac OS X have buggy CMSG_* macros, avoid using them.
Patch by Apple.

diffstat:

1 file changed, 22 insertions(+), 2 deletions(-)
configure.in |   24 ++++++++++++++++++++++--

diffs (57 lines):

diff -r 92921985e4f5 -r a217d9ae130b configure.in
--- a/configure.in	Fri Dec 19 09:37:13 2008 +0200
+++ b/configure.in	Fri Dec 19 10:02:49 2008 +0200
@@ -1205,9 +1205,17 @@ AC_CACHE_CHECK([whether fd passing works
       #include <fcntl.h>
       #include "fdpass.h"
       
+      int nopen(void)
+      {
+	      int i, n;
+	      struct stat sb;
+	      for (i = n = 0; i < 256; i++)
+		  if (fstat(i, &sb) == 0) n++;
+	      return n;
+      }
       int main(void)
       {
-	      int fd[2], send_fd, recv_fd, status;
+	      int fd[2], send_fd, recv_fd, status, n1, n2;
 	      struct stat st, st2;
 	      char data;
       
@@ -1216,6 +1224,7 @@ AC_CACHE_CHECK([whether fd passing works
 	      unlink("conftest.fdpass");
 	      if (fstat(send_fd, &st) < 0) return 2;
 	      if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) < 0) return 2;
+	      n1 = nopen();
       
 	      switch (fork()) {
 	      case -1:
@@ -1232,7 +1241,10 @@ AC_CACHE_CHECK([whether fd passing works
 			return status;
 		      if (fd_read(fd[1], &data, 1, &recv_fd) != 1) return 1;
 		      if (fstat(recv_fd, &st2) < 0) return 2;
-		      return st.st_ino == st2.st_ino ? 0 : 1;
+		      /* nopen check is for making sure that only a single fd
+		         was received */
+		      n2 = nopen();
+		      return st.st_ino == st2.st_ino && n2 == n1 + 1 ? 0 : 1;
 	      }
       }
     ], [
@@ -1250,6 +1262,14 @@ AC_CACHE_CHECK([whether fd passing works
     ])
   done
 ]);
+
+case "$host_os" in
+darwin[[1-9]].*)
+	if test "$i_cv_fd_passing" = "yes"; then
+		i_cv_fd_passing=buggy_cmsg_macros
+	fi
+	;;
+esac
 
 if test $i_cv_fd_passing = buggy_cmsg_macros; then
   AC_DEFINE(BUGGY_CMSG_MACROS,, Define if you have buggy CMSG macros)