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authorRich Felker <dalias@aerifal.cx>2011-04-08 09:24:19 -0400
committerRich Felker <dalias@aerifal.cx>2011-04-08 09:24:19 -0400
commit7168790763cdeb794df52be6e3b39fbb021c5a64 (patch)
treefa302a8cb7f16d6201db3499082cc6b70012769a /src/signal/x86_64/restore.s
parent5b8d81f706da0b7dc0abb5d0d74595d5b2f60d52 (diff)
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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...
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