Struct FileDesc

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pub struct FileDesc { /* private fields */ }

Expand description

Thin wrapper around an open file descriptor.

The wrapped file descriptor will be closed when the wrapper is dropped.

Implementations§

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impl FileDesc

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pub fn new(fd: OwnedFd) -> Self

Create FileDesc from an owned file descriptor.

This does not do anything to the file descriptor other than wrap it. Notably, it does not set the close-on-exec flag.

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pub unsafe fn from_raw_fd(fd: RawFd) -> Self

Wrap a raw file descriptor in a FileDesc.

This does not do anything to the file descriptor other than wrapping it. Notably, it does not set the close-on-exec flag.

§Safety

The input must be a valid file descriptor. The file descriptor must not be closed as long as it is managed by the created FileDesc.

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pub fn duplicate_from<T: AsFd>(other: T) -> Result<Self>

Duplicate a file descriptor from an object that has a file descriptor.

The new file descriptor will have the close-on-exec flag set. If the platform supports it, the flag will be set atomically.

The duplicated FileDesc will be the sole owner of the new file descriptor, but it will share ownership of the underlying kernel object.

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pub unsafe fn duplicate_raw_fd(fd: RawFd) -> Result<Self>

Duplicate a raw file descriptor and wrap it in a FileDesc.

The new file descriptor will have the close-on-exec flag set. If the platform supports it, the flag will be set atomically.

The duplicated FileDesc will be the sole owner of the new file descriptor, but it will share ownership of the underlying kernel object.

§Safety

The file descriptor must be valid, and duplicating it must not violate the safety requirements of any object already using the file descriptor.

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pub fn as_fd(&self) -> BorrowedFd<'_>

Get the file descriptor.

This function does not release ownership of the underlying file descriptor. The file descriptor will still be closed when the FileDesc is dropped.

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pub fn into_fd(self) -> OwnedFd

Release and get the raw file descriptor.

This function releases ownership of the underlying file descriptor. The file descriptor will not be closed.

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pub fn as_raw_fd(&self) -> RawFd

Get the raw file descriptor.

This function does not release ownership of the underlying file descriptor. The file descriptor will still be closed when the FileDesc is dropped.

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pub fn into_raw_fd(self) -> RawFd

Release and get the raw file descriptor.

This function releases ownership of the underlying file descriptor. The file descriptor will not be closed.

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pub fn duplicate(&self) -> Result<Self>

Try to duplicate the file descriptor.

The duplicated FileDesc will be the sole owner of the new file descriptor, but it will share ownership of the underlying kernel object.

The new file descriptor will have the close-on-exec flag set. If the platform supports it, the flag will be set atomically.

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pub fn set_close_on_exec(&self, close_on_exec: bool) -> Result<()>

Change the close-on-exec flag of the file descriptor.

You should always try to create file descriptors with the close-on-exec flag already set atomically instead of changing it later with this function. Setting the flag later on introduces a race condition if another thread forks before the call to set_close_on_exec finishes.

You can use this without any race condition to disable the close-on-exec flag after forking but before executing a new program.

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