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Finish implementing reception of file descriptors.

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This commit is contained in:
Mathieu Trossevin 2023-12-07 21:10:44 +01:00
parent e867697c2b
commit 6984d1a0ea
4 changed files with 15 additions and 158 deletions
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1
.gitignore vendored
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@ -1 +1,2 @@
/target
Cargo.lock

156
Cargo.lock generated
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@ -1,156 +0,0 @@
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1
Cargo.toml
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@ -6,5 +6,6 @@ edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
libc = "0.2.150"
rustix = { version = "0.38.26", features = ["fs", "net"] }
tracing = { version = "0.1.40", default-features = false, features = ["std", "log"] }

15
src/lib.rs
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@ -6,7 +6,7 @@ use std::ffi::{OsString, OsStr};
use std::os::fd::RawFd;
use error::{ReceiveError, ReceiveNameError, GetFdsError};
use rustix::fd::{BorrowedFd, OwnedFd};
use rustix::fd::{BorrowedFd, OwnedFd, AsRawFd};
use rustix::fs::FileType;
use rustix::net::SocketType;
@ -190,7 +190,18 @@ impl FileDescriptor {
_ => Self::SocketOther(fd),
}
},
_ => Self::Other(fd)
_ => {
// `rustix` does not enable us to test if a raw fd is a mq, so we must drop to libc here.
// SAFETY: `mq_getattr` is specified to return -1 when passed a fd which is not a mq.
// Furthermore, we ignore `attr` and rely only on the return value.
let mut attr = std::mem::MaybeUninit::<libc::mq_attr>::uninit();
let res = unsafe { libc::mq_getattr(fd.as_raw_fd(), attr.as_mut_ptr()) };
if res == 0 {
Self::MessageQueue(fd)
} else {
Self::Other(fd)
}
},
}
}
}