88 lines
2.3 KiB
Rust
88 lines
2.3 KiB
Rust
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/// Convert syscall types to libc types
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extern crate syscall;
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use super::{c_int, sa_family_t};
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use self::syscall::data::{Stat, TimeSpec};
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pub use self::syscall::error::*;
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pub use self::syscall::flag::*;
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pub use self::syscall::{
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clock_gettime, clone, execve as exec, exit, futex, getpid, kill, nanosleep, setgid, setuid, waitpid,
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chdir, getcwd, open, mkdir, rmdir, unlink, dup, pipe2,
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read, write, fpath, fstat, fsync, ftruncate, lseek, close
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};
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//TODO: Thread local
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pub static mut errno: c_int = 0;
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pub type stat = Stat;
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pub type timespec = TimeSpec;
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pub const AF_INET: sa_family_t = 1;
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pub const AF_INET6: sa_family_t = 2;
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pub const STDIN_FILENO: usize = 0;
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pub const STDOUT_FILENO: usize = 1;
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pub const STDERR_FILENO: usize = 2;
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fn cvt(result: syscall::Result<usize>) -> c_int {
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match result {
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Ok(res) => res as c_int,
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Err(err) => {
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unsafe { errno = err.errno };
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-1
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}
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}
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}
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// ralloc shims {
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/// Cooperatively gives up a timeslice to the OS scheduler.
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#[no_mangle]
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pub unsafe extern "C" fn sched_yield() -> c_int {
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cvt(syscall::sched_yield())
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}
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/// Increment data segment of this process by some, _n_, return a pointer to the new data segment
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/// start.
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///
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/// This uses the system call BRK as backend.
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///
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/// This is unsafe for multiple reasons. Most importantly, it can create an inconsistent state,
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/// because it is not atomic. Thus, it can be used to create Undefined Behavior.
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#[no_mangle]
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pub extern "C" fn sbrk(n: isize) -> *mut u8 {
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let orig_seg_end = match unsafe { syscall::brk(0) } {
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Ok(end) => end,
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Err(_) => return !0 as *mut u8
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};
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if n == 0 {
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return orig_seg_end as *mut u8;
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}
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let expected_end = match orig_seg_end.checked_add(n as usize) {
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Some(end) => end,
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None => return !0 as *mut u8
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};
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let new_seg_end = match unsafe { syscall::brk(expected_end) } {
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Ok(end) => end,
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Err(_) => return !0 as *mut u8
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};
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if new_seg_end != expected_end {
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// Reset the break.
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let _ = unsafe { syscall::brk(orig_seg_end) };
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!0 as *mut u8
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} else {
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orig_seg_end as *mut u8
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}
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}
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// } ralloc shims
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pub unsafe fn fcntl(_fd: usize, _cmd: c_int, _arg: c_int) -> c_int {
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cvt(Err(Error::new(ENOSYS)))
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}
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