Reduce syscalls in blocking_fd
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73f3f8f308
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19
src/lib.rs
19
src/lib.rs
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@ -1063,8 +1063,23 @@ impl fmt::Debug for Command {
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/// Moves `Fd` out of non-blocking mode.
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#[cfg(unix)]
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fn blocking_fd(fd: rustix::fd::BorrowedFd<'_>) -> io::Result<()> {
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let flags = rustix::fs::fcntl_getfl(fd)?;
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rustix::fs::fcntl_setfl(fd, flags & !rustix::fs::OFlags::NONBLOCK)?;
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cfg_if::cfg_if! {
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// ioctl(FIONBIO) sets the flag atomically, but we use this only on Linux
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// for now, as with the standard library, because it seems to behave
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// differently depending on the platform.
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// https://github.com/rust-lang/rust/commit/efeb42be2837842d1beb47b51bb693c7474aba3d
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// https://github.com/libuv/libuv/blob/e9d91fccfc3e5ff772d5da90e1c4a24061198ca0/src/unix/poll.c#L78-L80
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// https://github.com/tokio-rs/mio/commit/0db49f6d5caf54b12176821363d154384357e70a
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if #[cfg(target_os = "linux")] {
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rustix::io::ioctl_fionbio(fd, false)?;
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} else {
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let previous = rustix::fs::fcntl_getfl(fd)?;
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let new = previous & !rustix::fs::OFlags::NONBLOCK;
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if new != previous {
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rustix::fs::fcntl_setfl(fd, new)?;
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}
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}
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}
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Ok(())
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}
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