std::unix::fs::link using direct linkat call for Solaris and macOs.

Since we support solaris 11 and macOs Sierra as minimum, we can get rid
of the runtime overhead.
This commit is contained in:
David Carlier 2024-06-12 20:49:20 +00:00
parent 8cf5101d77
commit c81ffab3ec
No known key found for this signature in database
GPG Key ID: F81D3D3D951B3052

View File

@ -22,16 +22,12 @@ use crate::sys_common::{AsInner, AsInnerMut, FromInner, IntoInner};
#[cfg(any(all(target_os = "linux", target_env = "gnu"), target_vendor = "apple"))]
use crate::sys::weak::syscall;
#[cfg(any(target_os = "android", target_os = "macos", target_os = "solaris"))]
#[cfg(target_os = "android")]
use crate::sys::weak::weak;
use libc::{c_int, mode_t};
#[cfg(any(
target_os = "solaris",
all(target_os = "linux", target_env = "gnu"),
target_vendor = "apple",
))]
#[cfg(any(all(target_os = "linux", target_env = "gnu"), target_vendor = "apple"))]
use libc::c_char;
#[cfg(any(
all(target_os = "linux", not(target_env = "musl")),
@ -1753,19 +1749,6 @@ pub fn link(original: &Path, link: &Path) -> io::Result<()> {
// Android has `linkat` on newer versions, but we happen to know `link`
// always has the correct behavior, so it's here as well.
cvt(unsafe { libc::link(original.as_ptr(), link.as_ptr()) })?;
} else if #[cfg(any(target_os = "macos", target_os = "solaris"))] {
// MacOS (<=10.9) and Solaris 10 lack support for linkat while newer
// versions have it. We want to use linkat if it is available, so we use weak!
// to check. `linkat` is preferable to `link` because it gives us a flag to
// specify how symlinks should be handled. We pass 0 as the flags argument,
// meaning it shouldn't follow symlinks.
weak!(fn linkat(c_int, *const c_char, c_int, *const c_char, c_int) -> c_int);
if let Some(f) = linkat.get() {
cvt(unsafe { f(libc::AT_FDCWD, original.as_ptr(), libc::AT_FDCWD, link.as_ptr(), 0) })?;
} else {
cvt(unsafe { libc::link(original.as_ptr(), link.as_ptr()) })?;
};
} else {
// Where we can, use `linkat` instead of `link`; see the comment above
// this one for details on why.