Vendor things

third-party/vendor/rustix/src/fs/fcntl.rs

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+//! The Unix `fcntl` function is effectively lots of different functions hidden
+//! behind a single dynamic dispatch interface. In order to provide 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 = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
+use crate::fs::FlockOperation;
+use crate::{backend, io};
+use backend::fd::AsFd;
+use backend::fs::types::OFlags;
+
+// These `fcntl` functions live in the `io` module because they're not specific
+// to files, directories, or memfd objects. We re-export them here in the `fs`
+// module because the other the `fcntl` functions are here.
+#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
+pub use crate::io::fcntl_dupfd_cloexec;
+pub use crate::io::{fcntl_getfd, fcntl_setfd};
+
+/// `fcntl(fd, F_GETFL)`—Returns a file descriptor's access mode and status.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+#[inline]
+#[doc(alias = "F_GETFL")]
+pub fn fcntl_getfl<Fd: AsFd>(fd: Fd) -> io::Result<OFlags> {
+    backend::fs::syscalls::fcntl_getfl(fd.as_fd())
+}
+
+/// `fcntl(fd, F_SETFL, flags)`—Sets a file descriptor's status.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+#[inline]
+#[doc(alias = "F_SETFL")]
+pub fn fcntl_setfl<Fd: AsFd>(fd: Fd, flags: OFlags) -> io::Result<()> {
+    backend::fs::syscalls::fcntl_setfl(fd.as_fd(), flags)
+}
+
+/// `fcntl(fd, F_GET_SEALS)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "F_GET_SEALS")]
+pub fn fcntl_get_seals<Fd: AsFd>(fd: Fd) -> io::Result<SealFlags> {
+    backend::fs::syscalls::fcntl_get_seals(fd.as_fd())
+}
+
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
+use backend::fs::types::SealFlags;
+
+/// `fcntl(fd, F_ADD_SEALS)`
+///
+/// # References
+///  - [Linux]
+///
+/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
+#[cfg(any(linux_kernel, target_os = "freebsd", target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "F_ADD_SEALS")]
+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 = "espidf",
+    target_os = "fuchsia",
+    target_os = "redox",
+    target_os = "vita",
+    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)
+}