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27 lines
814 B
Rust
27 lines
814 B
Rust
// SPDX-License-Identifier: MPL-2.0
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use super::SyscallReturn;
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use crate::{
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fs::{file_table::FileDesc, utils::SeekFrom},
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prelude::*,
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};
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pub fn sys_lseek(fd: FileDesc, offset: isize, whence: u32, ctx: &Context) -> Result<SyscallReturn> {
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debug!("fd = {}, offset = {}, whence = {}", fd, offset, whence);
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let seek_from = match whence {
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0 => {
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if offset < 0 {
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return_errno!(Errno::EINVAL);
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}
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SeekFrom::Start(offset as usize)
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}
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1 => SeekFrom::Current(offset),
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2 => SeekFrom::End(offset),
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_ => return_errno!(Errno::EINVAL),
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};
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let file_table = ctx.process.file_table().lock();
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let file = file_table.get_file(fd)?;
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let offset = file.seek(seek_from)?;
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Ok(SyscallReturn::Return(offset as _))
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}
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