From 32b6bd32328a3e3404a8aad53f53243d29c758ae Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 25 Apr 2007 11:00:37 +0000
Subject: * ext/socket/socket.c (unix_send_io, unix_recv_io): use CMSG_DATA to 
  align file descriptor appropriately.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@12218 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/socket/socket.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

(limited to 'ext')

diff --git a/ext/socket/socket.c b/ext/socket/socket.c
index 4c23a1c178..179c13fce5 100644
--- a/ext/socket/socket.c
+++ b/ext/socket/socket.c
@@ -1956,7 +1956,7 @@ unix_send_io(sock, val)
 #if FD_PASSING_BY_MSG_CONTROL
     struct {
 	struct cmsghdr hdr;
-	int fd;
+        char pad[8+sizeof(int)+8];
     } cmsg;
 #endif
 
@@ -1986,12 +1986,12 @@ unix_send_io(sock, val)
 
 #if FD_PASSING_BY_MSG_CONTROL
     msg.msg_control = (caddr_t)&cmsg;
-    msg.msg_controllen = CMSG_SPACE(sizeof(int));
+    msg.msg_controllen = CMSG_LEN(sizeof(int));
     msg.msg_flags = 0;
     cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(int));
     cmsg.hdr.cmsg_level = SOL_SOCKET;
     cmsg.hdr.cmsg_type = SCM_RIGHTS;
-    cmsg.fd = fd;
+    *(int *)CMSG_DATA(&cmsg.hdr) = fd;
 #else
     msg.msg_accrights = (caddr_t)&fd;
     msg.msg_accrightslen = sizeof(fd);
@@ -2037,7 +2037,7 @@ unix_recv_io(argc, argv, sock)
 #if FD_PASSING_BY_MSG_CONTROL
     struct {
 	struct cmsghdr hdr;
-	int fd;
+        char pad[8+sizeof(int)+8];
     } cmsg;
 #endif
 
@@ -2066,7 +2066,7 @@ unix_recv_io(argc, argv, sock)
     cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(int));
     cmsg.hdr.cmsg_level = SOL_SOCKET;
     cmsg.hdr.cmsg_type = SCM_RIGHTS;
-    cmsg.fd = -1;
+    *(int *)CMSG_DATA(&cmsg.hdr) = -1;
 #else
     msg.msg_accrights = (caddr_t)&fd;
     msg.msg_accrightslen = sizeof(fd);
@@ -2079,22 +2079,22 @@ unix_recv_io(argc, argv, sock)
 #if FD_PASSING_BY_MSG_CONTROL
     if (msg.msg_controllen != CMSG_SPACE(sizeof(int))) {
       rb_raise(rb_eSocket,
-          "file descriptor was not passed (msg_controllen : %d != %d)",
+          "file descriptor was not passed (msg_controllen=%d, %d expected)",
           msg.msg_controllen, CMSG_SPACE(sizeof(int)));
     }
-    if (cmsg.hdr.cmsg_len != CMSG_SPACE(0) + sizeof(int)) {
+    if (cmsg.hdr.cmsg_len != CMSG_LEN(sizeof(int))) {
       rb_raise(rb_eSocket,
-          "file descriptor was not passed (cmsg_len : %d != %d)",
-          cmsg.hdr.cmsg_len, CMSG_SPACE(0) + sizeof(int));
+          "file descriptor was not passed (cmsg_len=%d, %d expected)",
+          cmsg.hdr.cmsg_len, CMSG_LEN(sizeof(int)));
     }
     if (cmsg.hdr.cmsg_level != SOL_SOCKET) {
       rb_raise(rb_eSocket,
-          "file descriptor was not passed (cmsg_level : %d != %d)",
+          "file descriptor was not passed (cmsg_level=%d, %d expected)",
           cmsg.hdr.cmsg_level, SOL_SOCKET);
     }
     if (cmsg.hdr.cmsg_type != SCM_RIGHTS) {
       rb_raise(rb_eSocket,
-          "file descriptor was not passed (cmsg_type : %d != %d)",
+          "file descriptor was not passed (cmsg_type=%d, %d expected)",
           cmsg.hdr.cmsg_type, SCM_RIGHTS);
     }
 #else
@@ -2106,7 +2106,7 @@ unix_recv_io(argc, argv, sock)
 #endif
 
 #if FD_PASSING_BY_MSG_CONTROL
-    fd = cmsg.fd;
+    fd = *(int *)CMSG_DATA(&cmsg.hdr);
 #endif
 
     if (klass == Qnil)
-- 
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