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On Linux, the cmsg_len field of struct cmsghdr has type size_t, but it
has size socklen_t on POSIX-compliant operating systems. So on
POSIX-compliant 64-bit operating systems, struct cmsghdr has padding
gaps that aren't present on Linux. Most of the issues fixed by this
commit related to those gaps.
src/sys/socket/ffi.rs
Fix the type of the cmsg_data field so the struct layout will be
correct.
src/sys/socket/mod.rs
In CmsgIterator.next, only return a single file descriptor.
sendmsg(2) can only stuff a single file descriptor into each
cmsg.
In cmsg_align, fix the rounding calculation, and eliminate a
division instruction.
Add a missing cmsg_align call in ControlMessage.len
In ControlMessage.encode_into, add any necessary padding bytes
between the cmsghdr and the data.
In sendmsg, fix some len<->capacity confusion.
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The best specification for control message layout appears to be
[RFC 2292, section 4](https://tools.ietf.org/html/rfc2292#section-4),
despite this not being a wire protocol. These definitions have also been
checked against glibc 2.19 <bits/socket.h> and Linux 4.0
<linux/socket.h>, and tested on Debian 8.1 and FreeBSD 10.2 x86_64.
The API differs a bit from the cmsg(3) API for type-safety reasons (and
also because the cmsg(3) API is terrible). See test/sys/test_socket.rs
for an example.
Only supports SCM_RIGHTS at the moment.
Fixes #88.
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This reverts commit 046af7d1ba82506f9bc48e62ac0584361025fc02.
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The best specification for control message layout appears to be
[RFC 2292, section 4](https://tools.ietf.org/html/rfc2292#section-4),
despite this not being a wire protocol. These definitions have also been
checked against glibc 2.19 <bits/socket.h> and Linux 4.0
<linux/socket.h>, and tested on Debian 8.1 and FreeBSD 10.2 x86_64.
The API differs a bit from the cmsg(4) API for type-safety reasons (and
also because the cmsg(4) API is terrible). See test/sys/test_socket.rs
for an example.
Only supports SCM_RIGHTS at the moment.
Fixes #88.
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