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31 lines
1.2 KiB
Rust
31 lines
1.2 KiB
Rust
// SPDX-License-Identifier: MPL-2.0
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use super::SyscallReturn;
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use crate::{fs::file_table::FileDesc, prelude::*};
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pub fn sys_close(fd: FileDesc, ctx: &Context) -> Result<SyscallReturn> {
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debug!("fd = {}", fd);
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let file = {
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let mut file_table = ctx.process.file_table().lock();
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let _ = file_table.get_file(fd)?;
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file_table.close_file(fd).unwrap()
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};
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// Cleanup work needs to be done in the `Drop` impl.
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//
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// We don't mind the races between closing the file descriptor and using the file descriptor,
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// because such races are explicitly allowed in the man pages. See the "Multithreaded processes
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// and close()" section in <https://man7.org/linux/man-pages/man2/close.2.html>.
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drop(file);
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// Linux has error codes for the close() system call for diagnostic and remedial purposes, but
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// only for a small subset of file systems such as NFS. We currently have no support for such
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// file systems, so it's fine to just return zero.
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//
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// For details, see the discussion at <https://github.com/asterinas/asterinas/issues/506> and
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// the "Dealing with error returns from close()" section at
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// <https://man7.org/linux/man-pages/man2/close.2.html>.
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Ok(SyscallReturn::Return(0))
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}
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