oddcoder
81da1bb1a3
This patch implements access function for both redox and linux and makes sure that neither access errno variable
54 lines
1.5 KiB
Rust
54 lines
1.5 KiB
Rust
// Wrapper over the access syscall that doesn't touch errno variable,
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// Do not use outside of ld_so
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use crate::{c_str::CStr, platform::types::*};
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#[cfg(target_os = "redox")]
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use crate::header::unistd::{F_OK, R_OK, W_OK, X_OK};
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#[cfg(target_os = "linux")]
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pub unsafe fn access(path: *const c_char, mode: c_int) -> c_int {
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let path = CStr::from_ptr(path);
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syscall!(ACCESS, (path).as_ptr(), mode) as c_int
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}
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// Wrapper over the systemcall, Do not use outside of ld_so
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#[cfg(target_os = "redox")]
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pub unsafe fn access(path: *const c_char, mode: c_int) -> c_int {
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let path = CStr::from_ptr(path).to_bytes();
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let fd = match syscall::open(path, syscall::O_CLOEXEC) {
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Ok(fd) => fd,
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_ => return -1,
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};
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if mode == F_OK {
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return 0;
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}
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let mut stat = syscall::Stat::default();
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if syscall::fstat(fd, &mut stat).is_err() {
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return -1;
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}
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let uid = match syscall::getuid() {
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Ok(uid) => uid,
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Err(_) => return -1,
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};
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let gid = match syscall::getgid() {
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Ok(gid) => gid,
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Err(_) => return -1,
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};
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let perms = if stat.st_uid as usize == uid {
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stat.st_mode >> (3 * 2 & 0o7)
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} else if stat.st_gid as usize == gid {
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stat.st_mode >> (3 * 1 & 0o7)
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} else {
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stat.st_mode & 0o7
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};
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if (mode & R_OK == R_OK && perms & 0o4 != 0o4)
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|| (mode & W_OK == W_OK && perms & 0o2 != 0o2)
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|| (mode & X_OK == X_OK && perms & 0o1 != 0o1)
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{
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return -1;
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}
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0
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}
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