diff options
Diffstat (limited to 'vendor/rustix/src/backend/libc/thread/syscalls.rs')
| -rw-r--r-- | vendor/rustix/src/backend/libc/thread/syscalls.rs | 523 |
1 files changed, 0 insertions, 523 deletions
diff --git a/vendor/rustix/src/backend/libc/thread/syscalls.rs b/vendor/rustix/src/backend/libc/thread/syscalls.rs deleted file mode 100644 index 33750f4..0000000 --- a/vendor/rustix/src/backend/libc/thread/syscalls.rs +++ /dev/null @@ -1,523 +0,0 @@ -//! libc syscalls supporting `rustix::thread`. - -use crate::backend::c; -use crate::backend::conv::ret; -use crate::io; -#[cfg(not(target_os = "redox"))] -use crate::thread::{NanosleepRelativeResult, Timespec}; -#[cfg(all(target_env = "gnu", fix_y2038))] -use crate::timespec::LibcTimespec; -use core::mem::MaybeUninit; -#[cfg(linux_kernel)] -use { - crate::backend::conv::{borrowed_fd, ret_c_int, ret_usize}, - crate::fd::BorrowedFd, - crate::pid::Pid, - crate::thread::{FutexFlags, FutexOperation}, - crate::utils::as_mut_ptr, -}; -#[cfg(not(any( - apple, - freebsdlike, - target_os = "emscripten", - target_os = "espidf", - target_os = "haiku", - target_os = "openbsd", - target_os = "redox", - target_os = "vita", - target_os = "wasi", -)))] -use {crate::thread::ClockId, core::ptr::null_mut}; - -#[cfg(all(target_env = "gnu", fix_y2038))] -weak!(fn __clock_nanosleep_time64(c::clockid_t, c::c_int, *const LibcTimespec, *mut LibcTimespec) -> c::c_int); -#[cfg(all(target_env = "gnu", fix_y2038))] -weak!(fn __nanosleep64(*const LibcTimespec, *mut LibcTimespec) -> c::c_int); - -#[cfg(not(any( - apple, - target_os = "dragonfly", - target_os = "emscripten", - target_os = "espidf", - target_os = "freebsd", // FreeBSD 12 has clock_nanosleep, but libc targets FreeBSD 11. - target_os = "haiku", - target_os = "openbsd", - target_os = "redox", - target_os = "vita", - target_os = "wasi", -)))] -#[inline] -pub(crate) fn clock_nanosleep_relative(id: ClockId, request: &Timespec) -> NanosleepRelativeResult { - // Old 32-bit version: libc has `clock_nanosleep` but it is not y2038 safe - // by default. But there may be a `__clock_nanosleep_time64` we can use. - #[cfg(fix_y2038)] - { - #[cfg(target_env = "gnu")] - if let Some(libc_clock_nanosleep) = __clock_nanosleep_time64.get() { - let flags = 0; - let mut remain = MaybeUninit::<LibcTimespec>::uninit(); - - unsafe { - return match libc_clock_nanosleep( - id as c::clockid_t, - flags, - &request.clone().into(), - remain.as_mut_ptr(), - ) { - 0 => NanosleepRelativeResult::Ok, - err if err == io::Errno::INTR.0 => { - NanosleepRelativeResult::Interrupted(remain.assume_init().into()) - } - err => NanosleepRelativeResult::Err(io::Errno(err)), - }; - } - } - - clock_nanosleep_relative_old(id, request) - } - - // Main version: libc is y2038 safe and has `clock_nanosleep`. - #[cfg(not(fix_y2038))] - unsafe { - let flags = 0; - let mut remain = MaybeUninit::<Timespec>::uninit(); - - match c::clock_nanosleep(id as c::clockid_t, flags, request, remain.as_mut_ptr()) { - 0 => NanosleepRelativeResult::Ok, - err if err == io::Errno::INTR.0 => { - NanosleepRelativeResult::Interrupted(remain.assume_init()) - } - err => NanosleepRelativeResult::Err(io::Errno(err)), - } - } -} - -#[cfg(all( - fix_y2038, - not(any( - apple, - target_os = "emscripten", - target_os = "haiku", - target_os = "vita" - )) -))] -fn clock_nanosleep_relative_old(id: ClockId, request: &Timespec) -> NanosleepRelativeResult { - let tv_sec = match request.tv_sec.try_into() { - Ok(tv_sec) => tv_sec, - Err(_) => return NanosleepRelativeResult::Err(io::Errno::OVERFLOW), - }; - let tv_nsec = match request.tv_nsec.try_into() { - Ok(tv_nsec) => tv_nsec, - Err(_) => return NanosleepRelativeResult::Err(io::Errno::INVAL), - }; - let old_request = c::timespec { tv_sec, tv_nsec }; - let mut old_remain = MaybeUninit::<c::timespec>::uninit(); - let flags = 0; - - unsafe { - match c::clock_nanosleep( - id as c::clockid_t, - flags, - &old_request, - old_remain.as_mut_ptr(), - ) { - 0 => NanosleepRelativeResult::Ok, - err if err == io::Errno::INTR.0 => { - let old_remain = old_remain.assume_init(); - let remain = Timespec { - tv_sec: old_remain.tv_sec.into(), - tv_nsec: old_remain.tv_nsec.into(), - }; - NanosleepRelativeResult::Interrupted(remain) - } - err => NanosleepRelativeResult::Err(io::Errno(err)), - } - } -} - -#[cfg(not(any( - apple, - target_os = "dragonfly", - target_os = "emscripten", - target_os = "espidf", - target_os = "freebsd", // FreeBSD 12 has clock_nanosleep, but libc targets FreeBSD 11. - target_os = "haiku", - target_os = "openbsd", - target_os = "redox", - target_os = "vita", - target_os = "wasi", -)))] -#[inline] -pub(crate) fn clock_nanosleep_absolute(id: ClockId, request: &Timespec) -> io::Result<()> { - // Old 32-bit version: libc has `clock_nanosleep` but it is not y2038 safe - // by default. But there may be a `__clock_nanosleep_time64` we can use. - #[cfg(fix_y2038)] - { - #[cfg(target_env = "gnu")] - if let Some(libc_clock_nanosleep) = __clock_nanosleep_time64.get() { - let flags = c::TIMER_ABSTIME; - unsafe { - return match { - libc_clock_nanosleep( - id as c::clockid_t, - flags, - &request.clone().into(), - null_mut(), - ) - } { - 0 => Ok(()), - err => Err(io::Errno(err)), - }; - } - } - - clock_nanosleep_absolute_old(id, request) - } - - // Main version: libc is y2038 safe and has `clock_nanosleep`. - #[cfg(not(fix_y2038))] - { - let flags = c::TIMER_ABSTIME; - - match unsafe { c::clock_nanosleep(id as c::clockid_t, flags as _, request, null_mut()) } { - 0 => Ok(()), - err => Err(io::Errno(err)), - } - } -} - -#[cfg(all( - fix_y2038, - not(any( - apple, - target_os = "emscripten", - target_os = "haiku", - target_os = "vita" - )) -))] -fn clock_nanosleep_absolute_old(id: ClockId, request: &Timespec) -> io::Result<()> { - let flags = c::TIMER_ABSTIME; - - let old_request = c::timespec { - tv_sec: request.tv_sec.try_into().map_err(|_| io::Errno::OVERFLOW)?, - tv_nsec: request.tv_nsec.try_into().map_err(|_| io::Errno::INVAL)?, - }; - match unsafe { c::clock_nanosleep(id as c::clockid_t, flags, &old_request, null_mut()) } { - 0 => Ok(()), - err => Err(io::Errno(err)), - } -} - -#[cfg(not(target_os = "redox"))] -#[inline] -pub(crate) fn nanosleep(request: &Timespec) -> NanosleepRelativeResult { - // Old 32-bit version: libc has `nanosleep` but it is not y2038 safe by - // default. But there may be a `__nanosleep64` we can use. - #[cfg(fix_y2038)] - { - #[cfg(target_env = "gnu")] - if let Some(libc_nanosleep) = __nanosleep64.get() { - let mut remain = MaybeUninit::<LibcTimespec>::uninit(); - unsafe { - return match ret(libc_nanosleep(&request.clone().into(), remain.as_mut_ptr())) { - Ok(()) => NanosleepRelativeResult::Ok, - Err(io::Errno::INTR) => { - NanosleepRelativeResult::Interrupted(remain.assume_init().into()) - } - Err(err) => NanosleepRelativeResult::Err(err), - }; - } - } - - nanosleep_old(request) - } - - // Main version: libc is y2038 safe and has `nanosleep`. - #[cfg(not(fix_y2038))] - unsafe { - let mut remain = MaybeUninit::<Timespec>::uninit(); - - match ret(c::nanosleep(request, remain.as_mut_ptr())) { - Ok(()) => NanosleepRelativeResult::Ok, - Err(io::Errno::INTR) => NanosleepRelativeResult::Interrupted(remain.assume_init()), - Err(err) => NanosleepRelativeResult::Err(err), - } - } -} - -#[cfg(fix_y2038)] -fn nanosleep_old(request: &Timespec) -> NanosleepRelativeResult { - let tv_sec = match request.tv_sec.try_into() { - Ok(tv_sec) => tv_sec, - Err(_) => return NanosleepRelativeResult::Err(io::Errno::OVERFLOW), - }; - let tv_nsec = match request.tv_nsec.try_into() { - Ok(tv_nsec) => tv_nsec, - Err(_) => return NanosleepRelativeResult::Err(io::Errno::INVAL), - }; - let old_request = c::timespec { tv_sec, tv_nsec }; - let mut old_remain = MaybeUninit::<c::timespec>::uninit(); - - unsafe { - match ret(c::nanosleep(&old_request, old_remain.as_mut_ptr())) { - Ok(()) => NanosleepRelativeResult::Ok, - Err(io::Errno::INTR) => { - let old_remain = old_remain.assume_init(); - let remain = Timespec { - tv_sec: old_remain.tv_sec.into(), - tv_nsec: old_remain.tv_nsec.into(), - }; - NanosleepRelativeResult::Interrupted(remain) - } - Err(err) => NanosleepRelativeResult::Err(err), - } - } -} - -#[cfg(linux_kernel)] -#[inline] -#[must_use] -pub(crate) fn gettid() -> Pid { - // `gettid` wasn't supported in glibc until 2.30, and musl until 1.2.2, - // so use `syscall`. - // <https://sourceware.org/bugzilla/show_bug.cgi?id=6399#c62> - weak_or_syscall! { - fn gettid() via SYS_gettid -> c::pid_t - } - - unsafe { - let tid = gettid(); - Pid::from_raw_unchecked(tid) - } -} - -#[cfg(linux_kernel)] -#[inline] -pub(crate) fn setns(fd: BorrowedFd<'_>, nstype: c::c_int) -> io::Result<c::c_int> { - // `setns` wasn't supported in glibc until 2.14, and musl until 0.9.5, - // so use `syscall`. - weak_or_syscall! { - fn setns(fd: c::c_int, nstype: c::c_int) via SYS_setns -> c::c_int - } - - unsafe { ret_c_int(setns(borrowed_fd(fd), nstype)) } -} - -#[cfg(linux_kernel)] -#[inline] -pub(crate) fn unshare(flags: crate::thread::UnshareFlags) -> io::Result<()> { - unsafe { ret(c::unshare(flags.bits() as i32)) } -} - -#[cfg(linux_kernel)] -#[inline] -pub(crate) fn capget( - header: &mut linux_raw_sys::general::__user_cap_header_struct, - data: &mut [MaybeUninit<linux_raw_sys::general::__user_cap_data_struct>], -) -> io::Result<()> { - syscall! { - fn capget( - hdrp: *mut linux_raw_sys::general::__user_cap_header_struct, - data: *mut linux_raw_sys::general::__user_cap_data_struct - ) via SYS_capget -> c::c_int - } - - unsafe { - ret(capget( - as_mut_ptr(header), - data.as_mut_ptr() - .cast::<linux_raw_sys::general::__user_cap_data_struct>(), - )) - } -} - -#[cfg(linux_kernel)] -#[inline] -pub(crate) fn capset( - header: &mut linux_raw_sys::general::__user_cap_header_struct, - data: &[linux_raw_sys::general::__user_cap_data_struct], -) -> io::Result<()> { - syscall! { - fn capset( - hdrp: *mut linux_raw_sys::general::__user_cap_header_struct, - data: *const linux_raw_sys::general::__user_cap_data_struct - ) via SYS_capset -> c::c_int - } - - unsafe { ret(capset(as_mut_ptr(header), data.as_ptr())) } -} - -#[cfg(linux_kernel)] -#[inline] -pub(crate) fn setuid_thread(uid: crate::ugid::Uid) -> io::Result<()> { - syscall! { - fn setuid(uid: c::uid_t) via SYS_setuid -> c::c_int - } - - unsafe { ret(setuid(uid.as_raw())) } -} - -#[cfg(linux_kernel)] -#[inline] -pub(crate) fn setresuid_thread( - ruid: crate::ugid::Uid, - euid: crate::ugid::Uid, - suid: crate::ugid::Uid, -) -> io::Result<()> { - #[cfg(any(target_arch = "x86", target_arch = "arm", target_arch = "sparc"))] - const SYS: c::c_long = c::SYS_setresuid32 as c::c_long; - #[cfg(not(any(target_arch = "x86", target_arch = "arm", target_arch = "sparc")))] - const SYS: c::c_long = c::SYS_setresuid as c::c_long; - - syscall! { - fn setresuid(ruid: c::uid_t, euid: c::uid_t, suid: c::uid_t) via SYS -> c::c_int - } - - unsafe { ret(setresuid(ruid.as_raw(), euid.as_raw(), suid.as_raw())) } -} - -#[cfg(linux_kernel)] -#[inline] -pub(crate) fn setgid_thread(gid: crate::ugid::Gid) -> io::Result<()> { - syscall! { - fn setgid(gid: c::gid_t) via SYS_setgid -> c::c_int - } - - unsafe { ret(setgid(gid.as_raw())) } -} - -#[cfg(linux_kernel)] -#[inline] -pub(crate) fn setresgid_thread( - rgid: crate::ugid::Gid, - egid: crate::ugid::Gid, - sgid: crate::ugid::Gid, -) -> io::Result<()> { - #[cfg(any(target_arch = "x86", target_arch = "arm", target_arch = "sparc"))] - const SYS: c::c_long = c::SYS_setresgid32 as c::c_long; - #[cfg(not(any(target_arch = "x86", target_arch = "arm", target_arch = "sparc")))] - const SYS: c::c_long = c::SYS_setresgid as c::c_long; - - syscall! { - fn setresgid(rgid: c::gid_t, egid: c::gid_t, sgid: c::gid_t) via SYS -> c::c_int - } - - unsafe { ret(setresgid(rgid.as_raw(), egid.as_raw(), sgid.as_raw())) } -} - -// TODO: This could be de-multiplexed. -#[cfg(linux_kernel)] -pub(crate) unsafe fn futex( - uaddr: *mut u32, - op: FutexOperation, - flags: FutexFlags, - val: u32, - utime: *const Timespec, - uaddr2: *mut u32, - val3: u32, -) -> io::Result<usize> { - #[cfg(all( - target_pointer_width = "32", - not(any(target_arch = "aarch64", target_arch = "x86_64")) - ))] - { - // TODO: Upstream this to the libc crate. - #[allow(non_upper_case_globals)] - const SYS_futex_time64: i32 = linux_raw_sys::general::__NR_futex_time64 as i32; - - syscall! { - fn futex_time64( - uaddr: *mut u32, - futex_op: c::c_int, - val: u32, - timeout: *const Timespec, - uaddr2: *mut u32, - val3: u32 - ) via SYS_futex_time64 -> c::ssize_t - } - - ret_usize(futex_time64( - uaddr, - op as i32 | flags.bits() as i32, - val, - utime, - uaddr2, - val3, - )) - .or_else(|err| { - // See the comments in `rustix_clock_gettime_via_syscall` about - // emulation. - if err == io::Errno::NOSYS { - futex_old(uaddr, op, flags, val, utime, uaddr2, val3) - } else { - Err(err) - } - }) - } - - #[cfg(any( - target_pointer_width = "64", - target_arch = "aarch64", - target_arch = "x86_64" - ))] - { - syscall! { - fn futex( - uaddr: *mut u32, - futex_op: c::c_int, - val: u32, - timeout: *const linux_raw_sys::general::__kernel_timespec, - uaddr2: *mut u32, - val3: u32 - ) via SYS_futex -> c::c_long - } - - ret_usize(futex( - uaddr, - op as i32 | flags.bits() as i32, - val, - utime.cast(), - uaddr2, - val3, - ) as isize) - } -} - -#[cfg(linux_kernel)] -#[cfg(all( - target_pointer_width = "32", - not(any(target_arch = "aarch64", target_arch = "x86_64")) -))] -unsafe fn futex_old( - uaddr: *mut u32, - op: FutexOperation, - flags: FutexFlags, - val: u32, - utime: *const Timespec, - uaddr2: *mut u32, - val3: u32, -) -> io::Result<usize> { - syscall! { - fn futex( - uaddr: *mut u32, - futex_op: c::c_int, - val: u32, - timeout: *const linux_raw_sys::general::__kernel_old_timespec, - uaddr2: *mut u32, - val3: u32 - ) via SYS_futex -> c::c_long - } - - let old_utime = linux_raw_sys::general::__kernel_old_timespec { - tv_sec: (*utime).tv_sec.try_into().map_err(|_| io::Errno::INVAL)?, - tv_nsec: (*utime).tv_nsec.try_into().map_err(|_| io::Errno::INVAL)?, - }; - ret_usize(futex( - uaddr, - op as i32 | flags.bits() as i32, - val, - &old_utime, - uaddr2, - val3, - ) as isize) -} |