112 lines
3.6 KiB
Rust
112 lines
3.6 KiB
Rust
//! The Unix `fcntl` function is effectively lots of different functions hidden
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//! behind a single dynamic dispatch interface. In order to provide a type-safe
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//! API, rustix makes them all separate functions so that they can have
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//! dedicated static type signatures.
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#[cfg(not(any(
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target_os = "emscripten",
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target_os = "espidf",
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target_os = "fuchsia",
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target_os = "redox",
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target_os = "vita",
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target_os = "wasi"
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)))]
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use crate::fs::FlockOperation;
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use crate::{backend, io};
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use backend::fd::AsFd;
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use backend::fs::types::OFlags;
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// These `fcntl` functions live in the `io` module because they're not specific
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// to files, directories, or memfd objects. We re-export them here in the `fs`
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// module because the other the `fcntl` functions are here.
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#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
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pub use crate::io::fcntl_dupfd_cloexec;
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pub use crate::io::{fcntl_getfd, fcntl_setfd};
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/// `fcntl(fd, F_GETFL)`—Returns a file descriptor's access mode and status.
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///
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/// # References
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/// - [POSIX]
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/// - [Linux]
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///
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/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
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/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
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#[inline]
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#[doc(alias = "F_GETFL")]
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pub fn fcntl_getfl<Fd: AsFd>(fd: Fd) -> io::Result<OFlags> {
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backend::fs::syscalls::fcntl_getfl(fd.as_fd())
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}
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/// `fcntl(fd, F_SETFL, flags)`—Sets a file descriptor's status.
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///
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/// # References
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/// - [POSIX]
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/// - [Linux]
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///
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/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
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/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
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#[inline]
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#[doc(alias = "F_SETFL")]
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pub fn fcntl_setfl<Fd: AsFd>(fd: Fd, flags: OFlags) -> io::Result<()> {
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backend::fs::syscalls::fcntl_setfl(fd.as_fd(), flags)
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}
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/// `fcntl(fd, F_GET_SEALS)`
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///
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/// # References
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/// - [Linux]
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///
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/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
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#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
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#[inline]
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#[doc(alias = "F_GET_SEALS")]
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pub fn fcntl_get_seals<Fd: AsFd>(fd: Fd) -> io::Result<SealFlags> {
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backend::fs::syscalls::fcntl_get_seals(fd.as_fd())
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}
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#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
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use backend::fs::types::SealFlags;
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/// `fcntl(fd, F_ADD_SEALS)`
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///
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/// # References
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/// - [Linux]
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///
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/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
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#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
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#[inline]
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#[doc(alias = "F_ADD_SEALS")]
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pub fn fcntl_add_seals<Fd: AsFd>(fd: Fd, seals: SealFlags) -> io::Result<()> {
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backend::fs::syscalls::fcntl_add_seals(fd.as_fd(), seals)
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}
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/// `fcntl(fd, F_SETLK)`—Acquire or release an `fcntl`-style lock.
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///
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/// This function doesn't currently have an offset or len; it currently always
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/// sets the `l_len` field to 0, which is a special case that means the entire
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/// file should be locked.
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///
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/// Unlike `flock`-style locks, `fcntl`-style locks are process-associated,
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/// meaning that they don't guard against being acquired by two threads in the
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/// same process.
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///
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/// # References
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/// - [POSIX]
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/// - [Linux]
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///
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/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
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/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
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#[cfg(not(any(
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target_os = "emscripten",
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target_os = "espidf",
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target_os = "fuchsia",
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target_os = "redox",
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target_os = "vita",
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target_os = "wasi"
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)))]
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#[inline]
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#[doc(alias = "F_SETLK")]
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#[doc(alias = "F_SETLKW")]
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pub fn fcntl_lock<Fd: AsFd>(fd: Fd, operation: FlockOperation) -> io::Result<()> {
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backend::fs::syscalls::fcntl_lock(fd.as_fd(), operation)
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}
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