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RedBear-OS/src/platform/redox/mod.rs
T
sourceturner 4b4dc2ce94 implement housekeeping for posix timers
2026-05-24 19:14:02 +02:00

1630 lines
52 KiB
Rust
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use core::{
convert::TryFrom,
mem::{self, size_of},
num::NonZeroU64,
ptr, slice, str,
};
use object::bytes_of_slice_mut;
use redox_protocols::protocol::{WaitFlags, wifstopped};
use redox_rt::{
RtTcb,
sys::{Resugid, WaitpidTarget},
};
use syscall::{
self, EILSEQ, ESRCH, Error, MODE_PERM, StdFsCallKind, StdFsCallMeta,
data::{Map, TimeSpec as redox_timespec},
dirent::DirentHeader,
};
use self::{
exec::Executable,
path::{FileLock, canonicalize, openat2, openat2_path},
};
use super::{Pal, Read, types::*};
use crate::{
c_str::{CStr, CString},
error::{Errno, Result},
fs::File,
header::{
errno::{
EBADF, EBADFD, EEXIST, EFAULT, EFBIG, EINTR, EINVAL, EIO, ENAMETOOLONG, ENOENT, ENOMEM,
ENOSYS, EOPNOTSUPP, EPERM,
},
fcntl::{
self, AT_EACCESS, AT_EMPTY_PATH, AT_FDCWD, AT_REMOVEDIR, AT_SYMLINK_FOLLOW, F_GETLK,
F_OFD_GETLK, F_OFD_SETLK, F_RDLCK, F_SETLK, F_SETLKW, F_UNLCK, F_WRLCK, flock,
},
limits,
pthread::{pthread_cancel, pthread_create},
signal::{NSIG, SIGEV_NONE, SIGEV_SIGNAL, SIGEV_THREAD, SIGRTMIN, sigevent},
stdio::RENAME_NOREPLACE,
stdlib::posix_memalign,
sys_file,
sys_mman::{MAP_ANONYMOUS, PROT_READ, PROT_WRITE},
sys_random,
sys_resource::{RLIM_INFINITY, rlimit, rusage},
sys_select::timeval,
sys_stat::{S_ISVTX, stat},
sys_statvfs::statvfs,
sys_time::timezone,
sys_utsname::{UTSLENGTH, utsname},
time::{
CLOCK_MONOTONIC, CLOCK_REALTIME, TIMER_ABSTIME, itimerspec, timer_internal_t, timespec,
},
unistd::{F_OK, R_OK, SEEK_CUR, SEEK_SET, W_OK, X_OK},
},
io::{self, BufReader, prelude::*},
ld_so::tcb::OsSpecific,
out::Out,
platform::{
free,
sys::timer::{TIMERS, timer_routine, timer_update_wake_time},
},
sync::rwlock::RwLock,
};
pub use redox_rt::proc::FdGuard;
mod epoll;
mod event;
mod exec;
mod extra;
mod libcscheme;
mod libredox;
pub(crate) mod path;
mod ptrace;
pub(crate) mod signal;
mod socket;
mod timer;
static mut BRK_CUR: *mut c_void = ptr::null_mut();
static mut BRK_END: *mut c_void = ptr::null_mut();
const PAGE_SIZE: usize = 4096;
fn round_up_to_page_size(val: usize) -> Option<usize> {
val.checked_add(PAGE_SIZE)
.map(|val| (val - 1) / PAGE_SIZE * PAGE_SIZE)
}
fn cvt_uid(id: c_int) -> Result<Option<u32>> {
if id == -1 {
return Ok(None);
}
Ok(Some(id.try_into().map_err(|_| Errno(EINVAL))?))
}
macro_rules! path_from_c_str {
($c_str:expr) => {{
match $c_str.to_str() {
Ok(ok) => ok,
Err(err) => {
ERRNO.set(EINVAL);
return -1;
}
}
}};
}
static CLONE_LOCK: RwLock<()> = RwLock::new(());
/// Redox syscall implementation of [`Pal`].
pub struct Sys;
impl Pal for Sys {
fn faccessat(fd: c_int, path: CStr, mode: c_int, flags: c_int) -> Result<()> {
let fd = FdGuard::new(Sys::openat(fd, path, fcntl::O_PATH | fcntl::O_CLOEXEC, 0)? as usize);
if (flags & !(AT_EACCESS)) != 0 {
return Err(Errno(EINVAL));
}
if mode == F_OK {
return Ok(());
}
let mut stat = syscall::Stat::default();
fd.fstat(&mut stat)?;
let Resugid {
ruid,
rgid,
euid,
egid,
..
} = redox_rt::sys::posix_getresugid();
let (uid, gid) = if (flags & AT_EACCESS) == AT_EACCESS {
(euid, egid)
} else {
(ruid, rgid)
};
let perms = (if stat.st_uid == uid {
stat.st_mode >> (3 * 2)
} else if stat.st_gid == gid {
stat.st_mode >> (3 * 1)
} else {
stat.st_mode
}) & 0o7;
if (mode & R_OK == R_OK && perms & 0o4 != 0o4)
|| (mode & W_OK == W_OK && perms & 0o2 != 0o2)
|| (mode & X_OK == X_OK && perms & 0o1 != 0o1)
{
return Err(Errno(EINVAL));
}
Ok(())
}
unsafe fn brk(addr: *mut c_void) -> Result<*mut c_void> {
// On first invocation, allocate a buffer for brk
if unsafe { BRK_CUR }.is_null() {
// 4 megabytes of RAM ought to be enough for anybody
const BRK_MAX_SIZE: usize = 4 * 1024 * 1024;
let allocated = unsafe {
Self::mmap(
ptr::null_mut(),
BRK_MAX_SIZE,
PROT_READ | PROT_WRITE,
MAP_ANONYMOUS,
0,
0,
)
}?;
unsafe {
BRK_CUR = allocated;
BRK_END = (allocated as *mut u8).add(BRK_MAX_SIZE) as *mut c_void
};
}
if addr.is_null() {
// Lookup what previous brk() invocations have set the address to
Ok(unsafe { BRK_CUR })
} else if unsafe { BRK_CUR } <= addr && addr < unsafe { BRK_END } {
// It's inside buffer, return
unsafe { BRK_CUR = addr };
Ok(addr)
} else {
// It was outside of valid range
Err(Errno(ENOMEM))
}
}
fn chdir(path: CStr) -> Result<()> {
let path = path.to_str().map_err(|_| Errno(EINVAL))?;
path::chdir(path)?;
Ok(())
}
fn chmod(path: CStr, mode: mode_t) -> Result<()> {
let file = File::open(path, fcntl::O_PATH | fcntl::O_CLOEXEC)?;
Self::fchmod(*file, mode)
}
fn chown(path: CStr, owner: uid_t, group: gid_t) -> Result<()> {
let file = File::open(path, fcntl::O_PATH | fcntl::O_CLOEXEC)?;
Self::fchown(*file, owner, group)
}
fn clock_getres(clk_id: clockid_t, res: Option<Out<timespec>>) -> Result<()> {
let path = match clk_id {
CLOCK_REALTIME => "/scheme/time/1/getres",
CLOCK_MONOTONIC => "/scheme/time/4/getres",
_ => return Err(Errno(EINVAL)),
};
let timerfd = FdGuard::open(&path, syscall::O_RDONLY)?;
let mut redox_res = timespec::default();
let buffer = unsafe {
slice::from_raw_parts_mut(
&mut redox_res as *mut _ as *mut u8,
mem::size_of::<timespec>(),
)
};
let bytes_read = redox_rt::sys::posix_read(timerfd.as_raw_fd(), buffer)?;
if bytes_read < mem::size_of::<timespec>() {
return Err(Errno(EIO));
}
if let Some(mut res) = res {
res.write(redox_res);
}
Ok(())
}
fn clock_gettime(clk_id: clockid_t, tp: Out<timespec>) -> Result<()> {
libredox::clock_gettime(clk_id as usize, tp)?;
Ok(())
}
unsafe fn clock_settime(clk_id: clockid_t, tp: *const timespec) -> Result<()> {
todo_skip!(0, "clock_settime({}, {:p}): not implemented", clk_id, tp);
Err(Errno(ENOSYS))
}
fn close(fd: c_int) -> Result<()> {
syscall::close(fd as usize)?;
Ok(())
}
fn dup2(fd1: c_int, fd2: c_int) -> Result<c_int> {
Ok(syscall::dup2(fd1 as usize, fd2 as usize, &[])? as c_int)
}
fn exit(status: c_int) -> ! {
let _ = redox_rt::sys::posix_exit(status);
loop {}
}
unsafe fn execve(path: CStr, argv: *const *mut c_char, envp: *const *mut c_char) -> Result<()> {
self::exec::execve(
Executable::AtPath(path),
self::exec::ArgEnv::C { argv, envp },
None,
)?;
unreachable!()
}
unsafe fn fexecve(
fildes: c_int,
argv: *const *mut c_char,
envp: *const *mut c_char,
) -> Result<()> {
self::exec::execve(
Executable::InFd {
file: File::new(fildes),
arg0: unsafe { CStr::from_ptr(argv.read()) }.to_bytes(),
},
self::exec::ArgEnv::C { argv, envp },
None,
)?;
unreachable!()
}
fn fchdir(fd: c_int) -> Result<()> {
path::fchdir(fd)?;
Ok(())
}
fn fchmodat(dirfd: c_int, path: Option<CStr>, mode: mode_t, flags: c_int) -> Result<()> {
const MASK: c_int = !(fcntl::AT_SYMLINK_NOFOLLOW | fcntl::AT_EMPTY_PATH);
if MASK & flags != 0 {
return Err(Errno(EINVAL));
}
let mut path = path
.and_then(|cs| str::from_utf8(cs.to_bytes()).ok())
.ok_or(Errno(ENOENT))?;
if path.is_empty() {
if flags & AT_EMPTY_PATH == AT_EMPTY_PATH {
if dirfd == AT_FDCWD {
path = ".";
} else {
return Ok(libredox::fchmod(dirfd as usize, mode as u16)?);
}
} else {
// If the path is empty but `AT_EMPTY_PATH` is **not** set, bail out.
return Err(Errno(ENOENT));
}
}
let file = openat2(dirfd, path, flags, 0)?;
libredox::fchmod(*file as usize, mode as u16)?;
Ok(())
}
fn fchownat(fildes: c_int, path: CStr, owner: uid_t, group: gid_t, flags: c_int) -> Result<()> {
const MASK: c_int = !(fcntl::AT_SYMLINK_NOFOLLOW | fcntl::AT_EMPTY_PATH);
if MASK & flags != 0 {
return Err(Errno(EINVAL));
}
let mut path = path.to_str().map_err(|_| Errno(ENOENT))?;
if path.is_empty() {
if flags & AT_EMPTY_PATH == AT_EMPTY_PATH {
if fildes == AT_FDCWD {
path = ".";
} else {
return Ok(libredox::fchown(fildes as usize, owner as _, group as _)?);
}
} else {
// If the path is empty but `AT_EMPTY_PATH` is **not** set, bail out.
return Err(Errno(ENOENT));
}
}
let file = openat2(fildes, path, flags, 0)?;
libredox::fchown(*file as usize, owner as _, group as _)?;
Ok(())
}
fn fcntl(fd: c_int, cmd: c_int, args: c_ulonglong) -> Result<c_int> {
match cmd {
F_SETLK | F_OFD_SETLK => {
let is_ofd = cmd == F_OFD_SETLK;
let flock = unsafe { &mut *(args as *mut flock) };
let (start, len) = Self::relative_to_absolute_foffset(
fd as usize,
flock.l_whence,
flock.l_start,
flock.l_len,
)?;
let start = start as u64 | if is_ofd { 1 << 63 } else { 0 };
let len = len as u64;
match flock.l_type as i32 {
F_UNLCK => {
let meta = StdFsCallMeta::new(StdFsCallKind::Unlock, start, len);
syscall::std_fs_call(fd as usize, &mut [], &meta)?;
return Ok(0);
}
F_RDLCK | F_WRLCK => {
let meta = StdFsCallMeta::new(
StdFsCallKind::Lock,
start,
len | if flock.l_type as i32 == F_WRLCK {
1 << 63
} else {
0
},
);
syscall::std_fs_call(fd as usize, &mut [], &meta)?;
return Ok(0);
}
_ => return Err(Errno(EINVAL)),
};
}
F_GETLK | F_OFD_GETLK => {
let is_ofd = cmd == F_OFD_GETLK;
let flock = unsafe { &mut *(args as *mut flock) };
if is_ofd && flock.l_pid != 0 {
log::warn!("POSIX requires `l_pid` to be 0 on input for `F_OFD_GETLK`");
return Err(Errno(EINVAL));
}
let (start, len) = Self::relative_to_absolute_foffset(
fd as usize,
flock.l_whence,
flock.l_start,
flock.l_len,
)?;
let mut start = start as u64;
if is_ofd {
start |= 1 << 63;
}
let mut len = len as u64;
if flock.l_type as i32 == F_WRLCK {
len |= 1 << 63;
}
let meta = StdFsCallMeta::new(StdFsCallKind::GetLock, 0, 0);
let payload = &mut [start, len];
// `pid` if traditional POSIX otherwise 0
let val =
match syscall::std_fs_call(fd as usize, bytes_of_slice_mut(payload), &meta) {
// According to POSIX Issue 8:
// > If no lock is found that would prevent this lock from being created, then
// > the structure shall be left unchanged except for the lock type in `l_type`
// > which shall be set to F_UNLCK.
Err(err) if err.errno == ESRCH => {
flock.l_type = F_UNLCK as i16;
return Ok(0);
}
Ok(val) => val,
Err(err) => return Err(Errno(err.errno)),
};
debug_assert_ne!(payload[0] & (1 << 63), 1 << 63);
if is_ofd {
flock.l_pid = -1;
} else {
flock.l_pid = val as i32;
}
let len = payload[1] & !(1 << 63);
if payload[1] & (1 << 63) == (1 << 63) {
flock.l_type = F_WRLCK as i16;
} else {
flock.l_type = F_RDLCK as i16;
}
flock.l_whence = SEEK_SET as _;
flock.l_start = start as i64;
flock.l_len = len as i64;
return Ok(0);
}
F_SETLKW => log::warn!("F_SETLKW: not yet implemented"),
_ => {}
}
Ok(syscall::fcntl(fd as usize, cmd as usize, args as usize)? as c_int)
}
fn fdatasync(fd: c_int) -> Result<()> {
// TODO: "Needs" syscall update
syscall::fsync(fd as usize)?;
Ok(())
}
fn flock(_fd: c_int, _operation: c_int) -> Result<()> {
// TODO: Redox does not have file locking yet
Ok(())
}
unsafe fn fork() -> Result<pid_t> {
// TODO: Find way to avoid lock.
let _guard = CLONE_LOCK.write();
Ok(redox_rt::proc::fork_impl(&redox_rt::proc::ForkArgs::Managed)? as pid_t)
}
fn fstatat(dirfd: c_int, path: Option<CStr>, mut buf: Out<stat>, flags: c_int) -> Result<()> {
// `path` should be non-null.
let path = path.ok_or(Errno(EFAULT))?;
let mut path = str::from_utf8(path.to_bytes()).ok().ok_or(Errno(EILSEQ))?;
if path.is_empty() {
if flags & AT_EMPTY_PATH == AT_EMPTY_PATH {
if dirfd == AT_FDCWD {
path = ".";
} else {
return Ok(unsafe { libredox::fstat(dirfd as usize, buf.as_mut_ptr()) }?);
}
} else {
// If the path is empty but `AT_EMPTY_PATH` is **not** set, bail out.
return Err(Errno(ENOENT));
}
}
let file = openat2(dirfd, path, flags, fcntl::O_PATH)?;
// Close the file descriptor after fstat(2) regardless of success or failure.
let fstat_res = unsafe { libredox::fstat(*file as usize, buf.as_mut_ptr()) };
let close_res = syscall::close(*file as usize);
if let Err(err) = fstat_res {
return Err(err.into());
}
close_res?;
Ok(fstat_res?)
}
fn fstatvfs(fildes: c_int, mut buf: Out<statvfs>) -> Result<()> {
unsafe {
libredox::fstatvfs(fildes as usize, buf.as_mut_ptr())?;
}
Ok(())
}
fn fsync(fd: c_int) -> Result<()> {
libredox::fsync(fd as usize)?;
Ok(())
}
fn ftruncate(fd: c_int, len: off_t) -> Result<()> {
libredox::ftruncate(fd as usize, len as usize)?;
Ok(())
}
#[inline]
unsafe fn futex_wait(addr: *mut u32, val: u32, deadline: Option<&timespec>) -> Result<()> {
let deadline = deadline.map(|d| syscall::TimeSpec::from(d));
(unsafe { redox_rt::sys::sys_futex_wait(addr, val, deadline.as_ref()) })?;
Ok(())
}
#[inline]
unsafe fn futex_wake(addr: *mut u32, num: u32) -> Result<u32> {
Ok(unsafe { redox_rt::sys::sys_futex_wake(addr, num) }?)
}
unsafe fn utimensat(
dirfd: c_int,
path: CStr,
times: *const timespec,
flag: c_int,
) -> Result<()> {
let mut path = path.to_str().map_err(|_| Errno(ENOENT))?;
if path.is_empty() {
if flag & AT_EMPTY_PATH == AT_EMPTY_PATH {
if dirfd == AT_FDCWD {
path = ".";
} else {
return Ok(unsafe { libredox::futimens(dirfd as usize, times) }?);
}
} else {
// If the path is empty but `AT_EMPTY_PATH` is **not** set, bail out.
return Err(Errno(ENOENT));
}
}
let file = openat2(dirfd, path, flag, fcntl::O_PATH | fcntl::O_CLOEXEC)?;
Ok(unsafe { libredox::futimens(*file as usize, times) }?)
}
fn getcwd(buf: Out<[u8]>) -> Result<()> {
path::getcwd(buf)?;
Ok(())
}
fn getdents(fd: c_int, buf: &mut [u8], opaque: u64) -> Result<usize> {
Ok(libredox::getdents(fd as usize, buf, opaque)?)
}
fn dir_seek(_fd: c_int, _off: u64) -> Result<()> {
// Redox getdents takes an explicit (opaque) offset, so this is a no-op.
Ok(())
}
// NOTE: fn is unsafe, but this just means we can assume more things. impl is safe
unsafe fn dent_reclen_offset(this_dent: &[u8], offset: usize) -> Option<(u16, u64)> {
let mut header = DirentHeader::default();
header.copy_from_slice(&this_dent.get(..size_of::<DirentHeader>())?);
// If scheme does not send a NUL byte, this shouldn't be able to cause UB for the caller.
if this_dent.get(usize::from(header.record_len) - 1) != Some(&b'\0') {
return None;
}
Some((header.record_len, header.next_opaque_id))
}
fn getegid() -> gid_t {
redox_rt::sys::posix_getresugid().egid as gid_t
}
fn geteuid() -> uid_t {
redox_rt::sys::posix_getresugid().euid as uid_t
}
fn getgid() -> gid_t {
redox_rt::sys::posix_getresugid().rgid as gid_t
}
fn getgroups(mut list: Out<[gid_t]>) -> Result<c_int> {
// FIXME: this operation doesn't scale when group/passwd file grows
let uid = Self::geteuid();
let pwd = crate::header::pwd::getpwuid(uid);
if pwd.is_null() {
return Err(Errno(ENOENT));
}
let username = unsafe { CStr::from_ptr((*pwd).pw_name) };
let username = username.to_bytes_with_nul();
let mut count = 0;
unsafe {
use crate::header::grp;
grp::setgrent();
while let Some(grp) = grp::getgrent().as_ref() {
let mut i = 0;
let mut found = false;
while !(*grp.gr_mem.offset(i)).is_null() {
let member = CStr::from_ptr(*grp.gr_mem.offset(i));
if member.to_bytes_with_nul() == username {
found = true;
break;
}
i += 1;
}
if found {
if !list.is_empty() && (count as usize) < list.len() {
list.index(count).write(grp.gr_gid);
}
count += 1;
}
}
grp::endgrent();
}
if !list.is_empty() && (count as usize) > list.len() {
return Err(Errno(EINVAL));
}
Ok(count as i32)
}
fn getpagesize() -> usize {
PAGE_SIZE
}
fn getpgid(pid: pid_t) -> Result<pid_t> {
Ok(redox_rt::sys::posix_getpgid(pid as usize)? as pid_t)
}
fn getpid() -> pid_t {
redox_rt::sys::posix_getpid() as pid_t
}
fn getppid() -> pid_t {
redox_rt::sys::posix_getppid() as pid_t
}
fn getpriority(which: c_int, who: id_t) -> Result<c_int> {
match redox_rt::sys::posix_getpriority(which, who as u32) {
Ok(kernel_prio) => {
let posix_prio = (kernel_prio as i32 * -1) + 40 as i32;
Ok(posix_prio)
}
Err(e) => Err(Errno(e.errno)),
}
}
fn getrandom(buf: &mut [u8], flags: c_uint) -> Result<usize> {
let path = if flags & sys_random::GRND_RANDOM != 0 {
//TODO: /dev/random equivalent
"/scheme/rand"
} else {
"/scheme/rand"
};
let mut open_flags = syscall::O_RDONLY | syscall::O_CLOEXEC;
if flags & sys_random::GRND_NONBLOCK != 0 {
open_flags |= syscall::O_NONBLOCK;
}
//TODO: store fd internally
let fd = FdGuard::open(path, open_flags)?;
Ok(fd.read(buf)?)
}
fn getresgid(
rgid_out: Option<Out<gid_t>>,
egid_out: Option<Out<gid_t>>,
sgid_out: Option<Out<gid_t>>,
) -> Result<()> {
let Resugid {
rgid, egid, sgid, ..
} = redox_rt::sys::posix_getresugid();
if let Some(mut rgid_out) = rgid_out {
rgid_out.write(rgid as _);
}
if let Some(mut egid_out) = egid_out {
egid_out.write(egid as _);
}
if let Some(mut sgid_out) = sgid_out {
sgid_out.write(sgid as _);
}
Ok(())
}
fn getresuid(
ruid_out: Option<Out<uid_t>>,
euid_out: Option<Out<uid_t>>,
suid_out: Option<Out<uid_t>>,
) -> Result<()> {
let Resugid {
ruid, euid, suid, ..
} = redox_rt::sys::posix_getresugid();
if let Some(mut ruid_out) = ruid_out {
ruid_out.write(ruid as _);
}
if let Some(mut euid_out) = euid_out {
euid_out.write(euid as _);
}
if let Some(mut suid_out) = suid_out {
suid_out.write(suid as _);
}
Ok(())
}
fn getrlimit(resource: c_int, mut rlim: Out<rlimit>) -> Result<()> {
todo_skip!(0, "getrlimit({}, {:p}): not implemented", resource, rlim);
rlim.write(rlimit {
rlim_cur: RLIM_INFINITY,
rlim_max: RLIM_INFINITY,
});
Ok(())
}
unsafe fn setrlimit(resource: c_int, rlim: *const rlimit) -> Result<()> {
todo_skip!(0, "setrlimit({}, {:p}): not implemented", resource, rlim);
Err(Errno(EPERM))
}
fn getrusage(who: c_int, r_usage: Out<rusage>) -> Result<()> {
todo_skip!(0, "getrusage({}, {:p}): not implemented", who, r_usage);
Ok(())
}
fn getsid(pid: pid_t) -> Result<pid_t> {
Ok(redox_rt::sys::posix_getsid(pid as usize)? as _)
}
fn gettid() -> pid_t {
// This is used by pthread mutexes for reentrant checks and must be nonzero
// and unique for each thread in the same process (but not cross-process)
let thread_fd = Self::current_os_tid().thread_fd;
(thread_fd & !syscall::UPPER_FDTBL_TAG)
.checked_add(1)
.unwrap()
.try_into()
.unwrap()
}
fn gettimeofday(mut tp: Out<timeval>, tzp: Option<Out<timezone>>) -> Result<()> {
let mut redox_tp = redox_timespec::default();
syscall::clock_gettime(syscall::CLOCK_REALTIME, &mut redox_tp)?;
tp.write(timeval {
tv_sec: redox_tp.tv_sec as time_t,
tv_usec: (redox_tp.tv_nsec / 1000) as suseconds_t,
});
if let Some(mut tzp) = tzp {
tzp.write(timezone {
tz_minuteswest: 0,
tz_dsttime: 0,
});
}
Ok(())
}
fn getuid() -> uid_t {
redox_rt::sys::posix_getresugid().ruid as uid_t
}
fn linkat(fd1: c_int, oldpath: CStr, fd2: c_int, newpath: CStr, flags: c_int) -> Result<()> {
// make sure the flags passed are valid.
// valid states: AT_SYMLINK_FOLLOW, or 0.
if (flags & !(AT_SYMLINK_FOLLOW)) != 0 {
return Err(Errno(EINVAL));
}
let newpath = newpath.to_str().map_err(|_| Errno(EINVAL))?;
// By default, we don't follow the symlink if there is one.
// We only follow it if AT_SYMLINK_FOLLOW is passed in flags.
// We represent this by setting O_NOFOLLOW by default, and clearing it
// if AT_SYMLINK_FOLLOW is present.
let mut oflags = fcntl::O_PATH | fcntl::O_CLOEXEC | fcntl::O_NOFOLLOW;
if (flags & AT_SYMLINK_FOLLOW) == AT_SYMLINK_FOLLOW {
oflags &= !fcntl::O_NOFOLLOW;
}
let file = File::openat(fd1, oldpath, oflags)?;
let newpath = openat2_path(fd2, newpath, 0)?;
syscall::flink(*file as usize, newpath)?;
Ok(())
}
fn lseek(fd: c_int, offset: off_t, whence: c_int) -> Result<off_t> {
Ok(syscall::lseek(fd as usize, offset as isize, whence as usize)? as off_t)
}
fn mkdirat(dir_fd: c_int, path_name: CStr, mode: mode_t) -> Result<()> {
File::createat(
dir_fd,
path_name,
fcntl::O_DIRECTORY | fcntl::O_EXCL | fcntl::O_CLOEXEC,
0o777,
)?;
Ok(())
}
fn mkfifoat(dir_fd: c_int, path_name: CStr, mode: mode_t) -> Result<()> {
Sys::mknodat(
dir_fd,
path_name,
syscall::MODE_FIFO as mode_t | (mode & 0o777),
0,
)
}
fn mknodat(dir_fd: c_int, path_name: CStr, mode: mode_t, dev: dev_t) -> Result<()> {
File::createat(dir_fd, path_name, fcntl::O_CREAT | fcntl::O_CLOEXEC, mode)?;
Ok(())
}
unsafe fn mlock(addr: *const c_void, len: usize) -> Result<()> {
// Redox never swaps
Ok(())
}
unsafe fn mlockall(flags: c_int) -> Result<()> {
// Redox never swaps
Ok(())
}
unsafe fn mmap(
addr: *mut c_void,
len: usize,
prot: c_int,
flags: c_int,
fildes: c_int,
off: off_t,
) -> Result<*mut c_void> {
// 0 is invalid per spec
if len == 0 {
return Err(Errno(EINVAL));
}
let Some(size) = round_up_to_page_size(len) else {
return Err(Errno(ENOMEM));
};
let map = Map {
offset: off as usize,
size,
flags: syscall::MapFlags::from_bits_truncate(
((prot as usize) << 16) | ((flags as usize) & 0xFFFF),
),
address: addr as usize,
};
Ok(if flags & MAP_ANONYMOUS == MAP_ANONYMOUS {
(unsafe { syscall::fmap(!0, &map) })?
} else {
(unsafe { syscall::fmap(fildes as usize, &map) })?
} as *mut c_void)
}
unsafe fn mremap(
addr: *mut c_void,
len: usize,
new_len: usize,
flags: c_int,
args: *mut c_void,
) -> Result<*mut c_void> {
Err(Errno(ENOSYS))
}
unsafe fn mprotect(addr: *mut c_void, len: usize, prot: c_int) -> Result<()> {
let Some(len) = round_up_to_page_size(len) else {
return Err(Errno(ENOMEM));
};
let Some(prot) = syscall::MapFlags::from_bits((prot as usize) << 16) else {
return Err(Errno(EINVAL));
};
(unsafe { syscall::mprotect(addr as usize, len, prot) })?;
Ok(())
}
unsafe fn msync(addr: *mut c_void, len: usize, flags: c_int) -> Result<()> {
todo_skip!(
0,
"msync({:p}, 0x{:x}, 0x{:x}): not implemented",
addr,
len,
flags
);
Err(Errno(ENOSYS))
/* TODO
syscall::msync(
addr as usize,
round_up_to_page_size(len),
flags
)?;
*/
}
unsafe fn munlock(addr: *const c_void, len: usize) -> Result<()> {
// Redox never swaps
Ok(())
}
unsafe fn munlockall() -> Result<()> {
// Redox never swaps
Ok(())
}
unsafe fn munmap(addr: *mut c_void, len: usize) -> Result<()> {
// 0 is invalid per spec
if len == 0 {
return Err(Errno(EINVAL));
}
let Some(len) = round_up_to_page_size(len) else {
return Err(Errno(ENOMEM));
};
(unsafe { syscall::funmap(addr as usize, len) })?;
Ok(())
}
unsafe fn madvise(addr: *mut c_void, len: usize, flags: c_int) -> Result<()> {
todo_skip!(
0,
"madvise({:p}, 0x{:x}, 0x{:x}): not implemented",
addr,
len,
flags
);
Err(Errno(ENOSYS))
}
unsafe fn nanosleep(rqtp: *const timespec, rmtp: *mut timespec) -> Result<()> {
let redox_rqtp = unsafe { (&*rqtp).into() };
let mut redox_rmtp = redox_timespec::default();
if !rmtp.is_null() {
redox_rmtp = unsafe { (&*rmtp).into() };
}
match redox_rt::sys::posix_nanosleep(&redox_rqtp, &mut redox_rmtp) {
Ok(_) => Ok(()),
Err(Error { errno: EINTR }) => {
unsafe {
if !rmtp.is_null() {
*rmtp = (&redox_rmtp).into();
}
};
Err(Errno(EINTR))
}
Err(Error { errno: e }) => Err(Errno(e)),
}
}
fn openat(dirfd: c_int, path: CStr, oflag: c_int, mode: mode_t) -> Result<c_int> {
let path = path.to_str().map_err(|_| Errno(EINVAL))?;
// POSIX states that umask should affect the following:
//
// open, openat, creat, mkdir, mkdirat,
// mkfifo, mkfifoat, mknod, mknodat,
// mq_open, and sem_open,
//
// all of which (the ones that exist thus far) currently call this function.
let effective_mode = mode & !(redox_rt::sys::get_umask() as mode_t);
Ok(libredox::openat(dirfd, path, oflag, effective_mode)? as c_int)
}
fn pipe2(mut fds: Out<[c_int; 2]>, flags: c_int) -> Result<()> {
fds.write(extra::pipe2(flags as usize)?);
Ok(())
}
fn posix_fallocate(fd: c_int, offset: u64, length: NonZeroU64) -> Result<()> {
// Redox doesn't actually have flock yet but presumably the file will need to be locked to
// avoid accidentally truncating it if the length changes.
let _guard = FileLock::lock(fd, sys_file::LOCK_EX)?;
// posix_fallocate is less nuanced than the Linux syscall fallocate.
// If the byte range is already allocated, posix_fallocate doesn't do any extra work.
// If the byte range is unallocated; free, uninitialized bytes are reserved.
// posix_fallocate does not shrink files.
//
// The main purpose of it is to ensure subsequent writes to a byte range don't fail.
let length = length.get();
let total_offset = offset.checked_add(length).ok_or(Errno(EFBIG))?;
let mut stat: stat = unsafe { mem::zeroed() };
unsafe { libredox::fstat(fd as usize, &mut stat)? };
let st_size = stat.st_size as u64;
// The difference between total_offset and the file size is the number of bytes to
// allocate. So, if it's negative then the file is already large enough and we don't
// need to do any extra work.
if let Some(total_len) = total_offset
.checked_sub(st_size)
.and_then(|diff| st_size.checked_add(diff))
{
let total_len: usize = total_len.try_into().map_err(|_| Errno(EFBIG))?;
libredox::ftruncate(fd as usize, total_len)?;
}
Ok(())
}
fn posix_getdents(fildes: c_int, buf: &mut [u8]) -> Result<usize> {
let current_offset = Self::lseek(fildes, 0, SEEK_CUR)? as u64;
let bytes_read = Self::getdents(fildes, buf, current_offset)?;
if bytes_read == 0 {
return Ok(0);
}
let mut bytes_processed = 0;
let mut next_offset = current_offset;
while bytes_processed < bytes_read {
let remaining_slice = &buf[bytes_processed..];
let (reclen, opaque_next) =
unsafe { Self::dent_reclen_offset(remaining_slice, bytes_processed) }
.ok_or(Errno(EIO))?;
if reclen == 0 {
return Err(Errno(EIO));
}
bytes_processed += reclen as usize;
next_offset = opaque_next;
}
Self::lseek(fildes, next_offset as off_t, SEEK_SET)?;
Ok(bytes_read)
}
unsafe fn rlct_clone(
stack: *mut usize,
os_specific: &mut OsSpecific,
) -> Result<crate::pthread::OsTid> {
let _guard = CLONE_LOCK.read();
let res = unsafe { redox_rt::thread::rlct_clone_impl(stack, os_specific) };
res.map(|thread_fd| crate::pthread::OsTid { thread_fd })
.map_err(|error| Errno(error.errno))
}
unsafe fn rlct_kill(os_tid: crate::pthread::OsTid, signal: usize) -> Result<()> {
redox_rt::sys::posix_kill_thread(os_tid.thread_fd, signal as u32)?;
Ok(())
}
fn current_os_tid() -> crate::pthread::OsTid {
crate::pthread::OsTid {
thread_fd: RtTcb::current().thread_fd().as_raw_fd(),
}
}
fn read(fd: c_int, buf: &mut [u8]) -> Result<usize> {
let fd = usize::try_from(fd).map_err(|_| Errno(EBADF))?;
Ok(redox_rt::sys::posix_read(fd, buf)?)
}
fn pread(fd: c_int, buf: &mut [u8], offset: off_t) -> Result<usize> {
unsafe {
Ok(syscall::syscall5(
syscall::SYS_READ2,
fd as usize,
buf.as_mut_ptr() as usize,
buf.len(),
offset as usize,
!0,
)?)
}
}
fn fpath(fildes: c_int, out: &mut [u8]) -> Result<usize> {
// Since this is used by realpath, it converts from the old format to the new one for
// compatibility reasons
let mut buf = [0; limits::PATH_MAX];
let count = syscall::fpath(fildes as usize, &mut buf)?;
let redox_path = str::from_utf8(&buf[..count])
.ok()
.and_then(|x| redox_path::RedoxPath::from_absolute(x))
.ok_or(Errno(EINVAL))?;
let (scheme, reference) = redox_path.as_parts().ok_or(Errno(EINVAL))?;
let mut cursor = io::Cursor::new(out);
let res = match scheme.as_ref() {
"file" => write!(cursor, "/{}", reference.as_ref().trim_start_matches('/')),
_ => write!(
cursor,
"/scheme/{}/{}",
scheme.as_ref(),
reference.as_ref().trim_start_matches('/')
),
};
match res {
Ok(()) => Ok(cursor.position() as usize),
Err(_err) => Err(Errno(ENAMETOOLONG)),
}
}
fn readlinkat(dirfd: c_int, path: CStr, out: &mut [u8]) -> Result<usize> {
let path = str::from_utf8(path.to_bytes()).map_err(|_| Errno(ENOENT))?;
let file = openat2(
dirfd,
path,
0,
fcntl::O_RDONLY | fcntl::O_SYMLINK | fcntl::O_CLOEXEC,
)?;
Sys::read(*file, out)
}
fn renameat2(
old_dir: c_int,
old_path: CStr,
new_dir: c_int,
new_path: CStr,
flags: c_uint,
) -> Result<()> {
const MASK: c_uint = !RENAME_NOREPLACE;
if MASK & flags != 0 {
return Err(Errno(EOPNOTSUPP));
}
let new_path = new_path.to_str().map_err(|_| Errno(EINVAL))?;
// Fail if the target exists with RENAME_NOREPLACE.
if flags & RENAME_NOREPLACE != 0
&& let Ok(fd) =
libredox::openat(new_dir, &new_path, fcntl::O_PATH | fcntl::O_CLOEXEC, 0)
.map(FdGuard::new)
{
return Err(Errno(EEXIST));
}
let old_path = old_path.to_str().map_err(|_| Errno(EINVAL))?;
// oflags are the same as Sys::rename above.
let source = openat2(old_dir, old_path, 0, fcntl::O_NOFOLLOW | fcntl::O_PATH)?;
let target = openat2_path(new_dir, new_path, 0)?;
// I'm avoiding Sys::rename to avoid reallocating a CString from a String.
syscall::frename(*source as usize, target)
.map(|_| ())
.map_err(Into::into)
}
fn sched_yield() -> Result<()> {
syscall::sched_yield()?;
Ok(())
}
unsafe fn setgroups(size: size_t, list: *const gid_t) -> Result<()> {
// TODO
todo_skip!(0, "setgroups({}, {:p}): not implemented", size, list);
Err(Errno(ENOSYS))
}
fn setpgid(pid: pid_t, pgid: pid_t) -> Result<()> {
redox_rt::sys::posix_setpgid(pid as usize, pgid as usize)?;
Ok(())
}
fn setpriority(which: c_int, who: id_t, prio: c_int) -> Result<()> {
let clamped_prio = prio.clamp(-20, 19);
let kernel_prio = (20 + clamped_prio) as u32;
match redox_rt::sys::posix_setpriority(which, who as u32, kernel_prio) {
Ok(_) => Ok(()),
Err(e) => Err(Errno(e.errno)),
}
}
fn setsid() -> Result<c_int> {
Ok(redox_rt::sys::posix_setsid()? as c_int)
}
fn setresgid(rgid: gid_t, egid: gid_t, sgid: gid_t) -> Result<()> {
redox_rt::sys::posix_setresugid(&Resugid {
ruid: None,
euid: None,
suid: None,
rgid: cvt_uid(rgid)?,
egid: cvt_uid(egid)?,
sgid: cvt_uid(sgid)?,
})?;
Ok(())
}
fn setresuid(ruid: uid_t, euid: uid_t, suid: uid_t) -> Result<()> {
redox_rt::sys::posix_setresugid(&Resugid {
ruid: cvt_uid(ruid)?,
euid: cvt_uid(euid)?,
suid: cvt_uid(suid)?,
rgid: None,
egid: None,
sgid: None,
})?;
Ok(())
}
fn symlinkat(path1: CStr, fd: c_int, path2: CStr) -> Result<()> {
let mut file = File::createat(
fd,
path2,
fcntl::O_WRONLY | fcntl::O_SYMLINK | fcntl::O_CLOEXEC,
0o777,
)?;
file.write(path1.to_bytes())
.map_err(|err| Errno(err.raw_os_error().unwrap_or(EIO)))?;
Ok(())
}
fn sync() -> Result<()> {
Ok(())
}
fn timer_create(clock_id: clockid_t, evp: &sigevent, mut timerid: Out<timer_t>) -> Result<()> {
if evp.sigev_notify == SIGEV_THREAD {
if evp.sigev_notify_function.is_none() {
return Err(Errno(EINVAL));
}
} else if evp.sigev_notify == SIGEV_SIGNAL {
const n_sig: i32 = NSIG as i32;
const rt_min: i32 = SIGRTMIN as i32;
const rt_max: i32 = SIGRTMIN as i32;
match evp.sigev_signo {
0..n_sig => {}
rt_min..=rt_max => {}
_ => {
return Err(Errno(EINVAL));
}
}
}
let path = match clock_id {
CLOCK_REALTIME => "/scheme/time/1",
CLOCK_MONOTONIC => "/scheme/time/4",
_ => return Err(Errno(EINVAL)),
};
let timerfd = FdGuard::open(&path, syscall::O_RDWR)?.to_upper()?;
let eventfd = FdGuard::new(Error::demux(unsafe {
event::redox_event_queue_create_v1(0)
})?)
.to_upper()?;
let timer_st = timer_internal_t {
clockid: clock_id,
timerfd: timerfd.take(),
eventfd: eventfd.take(),
evp: (*evp).clone(),
thread: ptr::null_mut(),
next_wake_time: itimerspec::default(),
next_wake_version: 0,
process_pid: Sys::getpid(),
};
let timers = &mut TIMERS.lock().0;
// allocate enough memory on the heap to store one timer_internal_t
let mut memory_pointer: *mut timer_internal_t = ptr::null_mut();
unsafe {
let result = posix_memalign(
(&mut memory_pointer as *mut *mut timer_internal_t).cast(),
align_of::<timer_internal_t>(),
size_of::<timer_internal_t>(),
);
assert_eq!(result, 0, "Failed to allocate or invalid alignment");
};
let pointer = {
ptr::NonNull::new(memory_pointer)
.expect("Pointer is guaranteed to not be null if posix_memalign returns 0")
};
// move value from the stack to the location we allocated on the heap
unsafe {
// Safety: If non-null, posix_memalign gives us a pointer that is valid
// for writes and properly aligned.
pointer.as_ptr().write(timer_st);
}
let timer_ptr = pointer.as_ptr() as timer_t;
timers.insert(timer_ptr);
timerid.write(timer_ptr);
Ok(())
}
fn timer_delete(timerid: timer_t) -> Result<()> {
let timers = &mut TIMERS.lock().0;
let removed = timers.remove(&timerid);
if !removed {
return Err(Errno(EINVAL));
}
let timer_st = unsafe { timer_internal_t::from_raw(timerid) };
let _ = syscall::close(timer_st.timerfd);
let _ = syscall::close(timer_st.eventfd);
if !timer_st.thread.is_null() {
let _ = unsafe { pthread_cancel(timer_st.thread) };
}
unsafe { free(timerid) };
Ok(())
}
fn timer_gettime(timerid: timer_t, mut value: Out<itimerspec>) -> Result<()> {
let timers = &mut TIMERS.lock().0;
if !timers.contains(&timerid) {
return Err(Errno(EINVAL));
}
let timer_st = unsafe { timer_internal_t::from_raw(timerid) };
let mut now = timespec::default();
Self::clock_gettime(timer_st.clockid, Out::from_mut(&mut now))?;
if timer_st.evp.sigev_notify == SIGEV_NONE {
if timespec::subtract(&timer_st.next_wake_time.it_value, &now).is_none() {
// error here means the timer is disarmed
let _ = timer_update_wake_time(timer_st);
}
}
let remaining = &timer_st.next_wake_time.it_value;
value.write(if remaining.is_zero() {
// disarmed
itimerspec::default()
} else {
itimerspec {
it_interval: timer_st.next_wake_time.it_interval.clone(),
it_value: timespec::subtract(remaining, &now).unwrap_or_default(),
}
});
Ok(())
}
fn timer_settime(
timerid: timer_t,
flags: c_int,
value: &itimerspec,
ovalue: Option<Out<itimerspec>>,
) -> Result<()> {
if let Some(ovalue) = ovalue {
Self::timer_gettime(timerid, ovalue)?;
}
let timers = &mut TIMERS.lock().0;
if !timers.contains(&timerid) {
return Err(Errno(EINVAL));
}
let timer_st = unsafe { timer_internal_t::from_raw(timerid) };
if value.it_value.is_zero() {
timer_st.next_wake_version += 1;
return Ok(());
}
timer_st.next_wake_time = {
let mut val = value.clone();
if flags & TIMER_ABSTIME == 0 {
let mut now = timespec::default();
Self::clock_gettime(timer_st.clockid, Out::from_mut(&mut now))?;
val.it_value = timespec::add(&now, &val.it_value).ok_or(Errno(EINVAL))?;
}
val
};
Error::demux(unsafe {
event::redox_event_queue_ctl_v1(timer_st.eventfd, timer_st.timerfd, 1, 0)
})?;
let buf_to_write = syscall::TimeSpec::from(&timer_st.next_wake_time.it_value);
let bytes_written = redox_rt::sys::posix_write(timer_st.timerfd, &buf_to_write)?;
if bytes_written < mem::size_of::<timespec>() {
return Err(Errno(EIO));
}
if timer_st.thread.is_null() {
timer_st.thread = match timer_st.evp.sigev_notify {
SIGEV_THREAD | SIGEV_SIGNAL => {
let mut tid = pthread_t::default();
let result = unsafe {
pthread_create(
&mut tid as *mut _,
ptr::null(),
timer_routine,
timerid as *mut c_void,
)
};
if result != 0 {
return Err(Errno(result));
}
tid
}
SIGEV_NONE => ptr::null_mut(),
_ => {
return Err(Errno(EINVAL));
}
};
}
Ok(())
}
fn umask(mask: mode_t) -> mode_t {
let new_effective_mask = mask & mode_t::from(MODE_PERM) & !S_ISVTX;
(redox_rt::sys::swap_umask(new_effective_mask as u32) as mode_t) & !S_ISVTX
}
fn uname(mut utsname: Out<utsname>) -> Result<(), Errno> {
fn gethostname(mut name: Out<[u8]>) -> io::Result<()> {
if name.is_empty() {
return Ok(());
}
let mut file = File::open(c"/etc/hostname".into(), fcntl::O_RDONLY | fcntl::O_CLOEXEC)?;
let mut read = 0;
let name_len = name.len();
loop {
match file.read_out(name.subslice(read, name_len - 1))? {
0 => break,
n => read += n,
}
}
name.index(read).write(0);
Ok(())
}
out_project! {
let utsname {
nodename: [c_char; UTSLENGTH],
sysname: [c_char; UTSLENGTH],
release: [c_char; UTSLENGTH],
machine: [c_char; UTSLENGTH],
version: [c_char; UTSLENGTH],
domainname: [c_char; UTSLENGTH],
} = utsname;
}
match gethostname(nodename.as_slice_mut().cast_slice_to::<u8>()) {
Ok(_) => (),
Err(_) => return Err(Errno(EIO)),
}
let file_path = c"/scheme/sys/uname".into();
let mut file = match File::open(file_path, fcntl::O_RDONLY | fcntl::O_CLOEXEC) {
Ok(ok) => ok,
Err(_) => return Err(Errno(EIO)),
};
let mut lines = BufReader::new(&mut file).lines();
let mut read_line = |mut dst: Out<[u8]>| {
// TODO: set nul byte without allocating CString
let line = match lines.next() {
Some(Ok(l)) => CString::new(l).map_err(|_| Errno(EIO))?,
None | Some(Err(_)) => return Err(Errno(EIO)),
};
let line_slice: &[u8] = line.as_bytes_with_nul();
if line_slice.len() > UTSLENGTH {
return Err(Errno(EIO));
}
dst.copy_common_length_from_slice(line_slice);
Ok(())
};
// The file format is currently as follows:
// <sysname>\n e.g. "Redox"
// <release>\n e.g. "0.9.0"
// <machine>\n e.g. "x86_64"
// <version>\n e.g. "<commit hash of kernel>
// A future file format might add the domainname.
// nodename is handled above with /etc/hostname, and the domainname is
// currently zeroed out.
read_line(sysname.as_slice_mut().cast_slice_to::<u8>())?;
read_line(release.as_slice_mut().cast_slice_to::<u8>())?;
read_line(machine.as_slice_mut().cast_slice_to::<u8>())?;
read_line(version.as_slice_mut().cast_slice_to::<u8>())?;
// Redox doesn't provide domainname in uname scheme
//read_line(domainname.as_slice_mut().cast_slice_to::<u8>())?;
domainname.as_slice_mut().zero();
Ok(())
}
fn unlinkat(fd: c_int, path: CStr, flags: c_int) -> Result<()> {
if (flags & !AT_REMOVEDIR) != 0 {
return Err(Errno(EINVAL));
}
let path = path.to_str().map_err(|_| Errno(EINVAL))?;
let path = openat2_path(fd, path, 0)?;
let canon = canonicalize(&path)?;
redox_rt::sys::unlink(&canon, flags.try_into().map_err(|_| Errno(EINVAL))?)?;
Ok(())
}
fn waitpid(pid: pid_t, stat_loc: Option<Out<'_, c_int>>, options: c_int) -> Result<pid_t> {
let res = None;
let mut status = 0;
let options = usize::try_from(options)
.ok()
.and_then(WaitFlags::from_bits)
.ok_or(Errno(EINVAL))?;
let inner = |status: &mut usize, flags| {
redox_rt::sys::sys_waitpid(WaitpidTarget::from_posix_arg(pid as isize), status, flags)
};
// First, allow ptrace to handle waitpid
// TODO: Handle special PIDs here (such as -1)
let state = ptrace::init_state();
// TODO: Fix ptrace deadlock seen during openposixtestsuite signals tests
// let mut sessions = state.sessions.lock();
// if let Ok(session) = ptrace::get_session(&mut sessions, pid) {
// if !options.contains(WaitFlags::WNOHANG) {
// let mut _event = PtraceEvent::default();
// let _ = (&mut &session.tracer).read(&mut _event);
// res = Some(inner(
// &mut status,
// options | WaitFlags::WNOHANG | WaitFlags::WUNTRACED,
// ));
// if res == Some(Ok(0)) {
// // WNOHANG, just pretend ptrace SIGSTOP:ped this
// status = (redox_rt::protocol::SIGSTOP << 8) | 0x7f;
// assert!(wifstopped(status));
// assert_eq!(wstopsig(status), redox_rt::protocol::SIGSTOP);
// res = Some(Ok(pid as usize));
// }
// }
// }
// If ptrace didn't impact this waitpid, proceed *almost* as
// normal: We still need to add WUNTRACED, but we only return
// it if (and only if) a ptrace traceme was activated during
// the wait.
let res = res.unwrap_or_else(|| {
loop {
let res = inner(&mut status, options | WaitFlags::WUNTRACED);
// TODO: Also handle special PIDs here
if !wifstopped(status)
|| options.contains(WaitFlags::WUNTRACED)
|| ptrace::is_traceme(pid)
{
break res;
}
}
});
// If stat_loc is non-null, set that and the return
if let Some(mut stat_loc) = stat_loc {
stat_loc.write(status as c_int);
}
Ok(res? as pid_t)
}
fn write(fd: c_int, buf: &[u8]) -> Result<usize> {
let fd = usize::try_from(fd).map_err(|_| Errno(EBADFD))?;
Ok(redox_rt::sys::posix_write(fd, buf)?)
}
fn pwrite(fd: c_int, buf: &[u8], offset: off_t) -> Result<usize> {
unsafe {
Ok(syscall::syscall5(
syscall::SYS_WRITE2,
fd as usize,
buf.as_ptr() as usize,
buf.len(),
offset as usize,
!0,
)?)
}
}
fn verify() -> bool {
// YIELD on Redox is 20, which is SYS_ARCH_PRCTL on Linux
(unsafe { syscall::syscall5(syscall::number::SYS_YIELD, !0, !0, !0, !0, !0) }).is_ok()
}
unsafe fn exit_thread(stack_base: *mut (), stack_size: usize) -> ! {
unsafe { redox_rt::thread::exit_this_thread(stack_base, stack_size) }
}
}
impl Sys {
fn relative_to_absolute_foffset(
fd: usize,
whence: c_short,
start: off_t,
len: off_t,
) -> Result<(off_t, off_t)> {
// let file_off = Self::lseek(fd, 0, SEEK_SET)?;
match whence as i32 {
SEEK_SET => {
let (start, len) = if len < 0 {
(start + len, -len)
} else {
(start, len)
};
if start < 0 {
return Err(Errno(EINVAL));
}
assert!(len >= 0);
Ok((start, len))
}
// FIXME: andypython: SEEK_CUR, SEEK_END
c => {
log::warn!(
"Sys::relative_to_absolute_foffset: whence={whence} not yet implemented"
);
Ok((0, 0))
}
}
}
}
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