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26 lines
793 B
Rust
26 lines
793 B
Rust
//! File and filesystem-related syscalls
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use crate::mm::page_table::translated_byte_buffer;
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use crate::print;
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use crate::task::TASK_MANAGER;
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const FD_STDOUT: usize = 1;
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/// write buf of length `len` to a file with `fd`
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pub fn sys_write(fd: usize, buf: *const u8, len: usize) -> isize {
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match fd {
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FD_STDOUT => {
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// 根据当前页表 找到物理内存基地址
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// 这里需要从应用的地址空间里面寻找数据
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let buffers = translated_byte_buffer(TASK_MANAGER.get_current_token(), buf, len);
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for buffer in buffers {
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print!("{}", core::str::from_utf8(buffer).unwrap());
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}
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len as isize
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}
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_ => {
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panic!("Unsupported fd in sys_write!");
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}
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}
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}
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