diff options
Diffstat (limited to 'vendor/rustix/src/fs/fcntl.rs')
| -rw-r--r-- | vendor/rustix/src/fs/fcntl.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/vendor/rustix/src/fs/fcntl.rs b/vendor/rustix/src/fs/fcntl.rs index 80ac858c0..0f557ef7f 100644 --- a/vendor/rustix/src/fs/fcntl.rs +++ b/vendor/rustix/src/fs/fcntl.rs @@ -3,6 +3,13 @@ //! a type-safe API, rustix makes them all separate functions so that they //! can have dedicated static type signatures. +#[cfg(not(any( + target_os = "emscripten", + target_os = "fuchsia", + target_os = "redox", + target_os = "wasi" +)))] +use crate::fs::FlockOperation; use crate::{backend, io}; use backend::fd::AsFd; use backend::fs::types::OFlags; @@ -85,3 +92,32 @@ pub use backend::fs::types::SealFlags; pub fn fcntl_add_seals<Fd: AsFd>(fd: Fd, seals: SealFlags) -> io::Result<()> { backend::fs::syscalls::fcntl_add_seals(fd.as_fd(), seals) } + +/// `fcntl(fd, F_SETLK)`—Acquire or release an `fcntl`-style lock. +/// +/// This function doesn't currently have an offset or len; it currently always +/// sets the `l_len` field to 0, which is a special case that means the entire +/// file should be locked. +/// +/// Unlike `flock`-style locks, `fcntl`-style locks are process-associated, +/// meaning that they don't guard against being acquired by two threads in +/// the same process. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html +/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html +#[cfg(not(any( + target_os = "emscripten", + target_os = "fuchsia", + target_os = "redox", + target_os = "wasi" +)))] +#[inline] +#[doc(alias = "F_SETLK")] +#[doc(alias = "F_SETLKW")] +pub fn fcntl_lock<Fd: AsFd>(fd: Fd, operation: FlockOperation) -> io::Result<()> { + backend::fs::syscalls::fcntl_lock(fd.as_fd(), operation) +} |