73 lines
2.0 KiB
Rust
73 lines
2.0 KiB
Rust
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use std::mem::MaybeUninit;
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/// Safe wrapper for ucontext_t struct of linux-gnu libc
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///
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/// setcontext and getcontext are unsafe function, this wrap unsafe libc functions
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///
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/// This struct doesn't work on windows, because this struct is unavailable
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///
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/// todo ucontext_t is not thread-safe (doesn't implements Send and Sync trait), and cannot be use in Threads as rust require var in Mutex (see system.rs) to have everything inside to implements thread-safe traits
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#[derive(PartialEq)]
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pub struct UContextT {
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#[cfg(not(target_os = "windows"))] // struct non disponible sur la libc sur windows
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pub buf: libc::ucontext_t,
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pub stack_bottom: Vec<i8>
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}
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#[cfg(not(target_os = "windows"))]
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#[allow(unused)] // Temporary as we currently doesn't use this structure (this structure may disapear in a near future)
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impl UContextT {
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pub fn new() -> Self {
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let mut context = MaybeUninit::<libc::ucontext_t>::uninit();
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unsafe { libc::getcontext(context.as_mut_ptr()) };
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Self {
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buf: unsafe { context.assume_init() },
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stack_bottom: Vec::default(),
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}
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}
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/// Get user context and store it in variable pointed to by UCP.
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///
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/// Use `man getcontext` for more informations
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pub fn get_context(&mut self) -> i32 {
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unsafe {
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libc::getcontext(&mut self.buf)
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}
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}
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/// Set user context from information of variable pointed to by UCP.
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///
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/// Use `man setcontext` for more informations
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pub fn set_context(&mut self) -> i32 {
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unsafe {
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libc::setcontext(&self.buf)
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}
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}
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pub fn make_context(&mut self, func: extern "C" fn(), args: i32) {
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unsafe {
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libc::makecontext(&mut self.buf, func, args)
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}
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}
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}
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#[cfg(target_os = "windows")]
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impl UContextT {
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pub fn new() -> Self {
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Self {
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stack_bottom: Vec::default()
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}
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}
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pub fn get_context(&mut self) {
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// no op
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}
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pub fn set_context(&mut self) {
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// no op
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}
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} |