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It already fully validated its arguments, so there's no need for it to
be `unsafe`.
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Some things are not implemented yet in redox, so a lot of annotations
were added to remove functions when compiling for redox. Those functions
will hopefully be added in time, but for now it's better to have partial
support than none.
Blocked by https://github.com/rust-lang/libc/pull/1438
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The libc_bitflags! macro was replaced with a non-recursive one supporting
only public structs. I could not figure out how to make the old macro work
with the upgrade, so I reworked part of the bitflags! macro directly to suit
our needs, much as the original recursive macro was made. There are no uses
of this macro for non-public structs, so this is not a problem for internal code.
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This reduces the boilerplate necessary when wrapping libc constants
into groups via enums
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This is necessary because certain flags in libc have different types, generally
due to a mistake when adding the flags to the libc. See
https://github.com/rust-lang/libc/pull/511 for an example of such a
discrepency.
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There were multiple errors regarding Unix domain sockets:
* UnixAddr::path assumed that gethostbyname and similar functions would
include the terminating null as part of len. That is not universally
true. In fact, POSIX only guarantees that len will be at least large
enough to store the non-null-terminated path. So it could be larger or
smaller than nix was assuming. Since abstract sockets' paths are not
strings, we can't modify gethostbyname. Instead, I implemented the fix in
UnixAddr::path and UnixAddr::new. I clarified the documentation too.
* SockAddr::as_ffi_pair contained a Linuxism.
* sockaddr_storage_to_addr forgot to adjust sun_len when creating a UnixAddr
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We define many bitflags types with values from the libc crate. Currently
these look like this:
bitflags!{
flags ProtFlags: libc::c_int {
const PROT_NONE = libc::PROT_NONE,
const PROT_READ = libc::PROT_READ,
const PROT_WRITE = libc::PROT_WRITE,
const PROT_EXEC = libc::PROT_EXEC,
#[cfg(any(target_os = "linux", target_os = "android"))]
const PROT_GROWSDOWN = libc::PROT_GROWSDOWN,
#[cfg(any(target_os = "linux", target_os = "android"))]
const PROT_GROWSUP = libc::PROT_GROWSUP,
}
}
There's some repetition which is tedious. With the new macro, the above
can instead be written
libc_bitflags!{
flags ProtFlags: libc::c_int {
PROT_NONE,
PROT_READ,
PROT_WRITE,
PROT_EXEC,
#[cfg(any(target_os = "linux", target_os = "android"))]
PROT_GROWSDOWN,
#[cfg(any(target_os = "linux", target_os = "android"))]
PROT_GROWSUP,
}
}
Thanks to Daniel Keep for the Little Book of Rust Macros, and for
helping with this macro.
Refs https://github.com/nix-rust/nix/issues/264
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