path: root/arch/x86_64/bits/socket.h
diff options
authorRich Felker <>2011-04-08 09:24:19 -0400
committerRich Felker <>2011-04-08 09:24:19 -0400
commit7168790763cdeb794df52be6e3b39fbb021c5a64 (patch)
treefa302a8cb7f16d6201db3499082cc6b70012769a /arch/x86_64/bits/socket.h
parent5b8d81f706da0b7dc0abb5d0d74595d5b2f60d52 (diff)
workaround broken msghdr struct on 64bit linux
POSIX clearly specifies the type of msg_iovlen and msg_controllen, and Linux ignores it and makes them both size_t instead. to work around this we add padding (instead of just using the wrong types like glibc does), but we also need to patch-up the struct before passing it to the kernel in case the caller did not zero-fill it. if i could trust the kernel to just ignore the upper 32 bits, this would not be necessary, but i don't think it will ignore them...
Diffstat (limited to 'arch/x86_64/bits/socket.h')
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86_64/bits/socket.h b/arch/x86_64/bits/socket.h
index b3230625..0e5ee1aa 100644
--- a/arch/x86_64/bits/socket.h
+++ b/arch/x86_64/bits/socket.h
@@ -3,9 +3,9 @@ struct msghdr
void *msg_name;
socklen_t msg_namelen;
struct iovec *msg_iov;
- int msg_iovlen;
+ int msg_iovlen, __pad1;
void *msg_control;
- socklen_t msg_controllen;
+ socklen_t msg_controllen, __pad2;
int msg_flags;