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Merge branch 'document-dlfcn' into 'master'

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Document dlfcn

See merge request redox-os/relibc!767
This commit is contained in:
Jeremy Soller
2025-11-29 09:24:09 -07:00
parent 8ad1d3c110 329db0dd9c
commit 53e89724b7
1 changed files with 13 additions and 2 deletions
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src/header/dlfcn/mod.rs
+13 -2
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@@ -1,4 +1,6 @@
//! dlfcn implementation for Redox, following http://pubs.opengroup.org/onlinepubs/7908799/xsh/dlfcn.h.html
//! `dlfcn.h` implementation.
//!
//! See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/dlfcn.h.html>.
#![deny(unsafe_op_in_unsafe_fn)]
// FIXME(andypython): remove this when #![allow(warnings, unused_variables)] is
@@ -36,6 +38,7 @@ fn set_last_error(error: DlError) {
ERROR.store(error.repr().as_ptr() as usize, Ordering::SeqCst);
}
/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/dlfcn.h.html>.
#[repr(C)]
#[allow(non_camel_case_types)]
pub struct Dl_info {
@@ -45,8 +48,12 @@ pub struct Dl_info {
dli_saddr: *mut c_void,
}
/// alias as per spec update: https://www.austingroupbugs.net/view.php?id=1847
pub type Dl_info_t = Dl_info;
/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/dladdr.html>.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn dladdr(_addr: *mut c_void, info: *mut Dl_info) -> c_int {
pub unsafe extern "C" fn dladdr(_addr: *mut c_void, info: *mut Dl_info_t) -> c_int {
//TODO
unsafe {
(*info).dli_fname = ptr::null();
@@ -57,6 +64,7 @@ pub unsafe extern "C" fn dladdr(_addr: *mut c_void, info: *mut Dl_info) -> c_int
0
}
/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/dlopen.html>.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn dlopen(cfilename: *const c_char, flags: c_int) -> *mut c_void {
//TODO support all sort of flags
@@ -111,6 +119,7 @@ pub unsafe extern "C" fn dlopen(cfilename: *const c_char, flags: c_int) -> *mut
}
}
/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/dlsym.html>.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn dlsym(handle: *mut c_void, symbol: *const c_char) -> *mut c_void {
let handle = ObjectHandle::from_ptr(handle);
@@ -150,6 +159,7 @@ pub unsafe extern "C" fn dlsym(handle: *mut c_void, symbol: *const c_char) -> *m
}
}
/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/dlclose.html>.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn dlclose(handle: *mut c_void) -> c_int {
let tcb = match unsafe { Tcb::current() } {
@@ -177,6 +187,7 @@ pub unsafe extern "C" fn dlclose(handle: *mut c_void) -> c_int {
0
}
/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/dlerror.html>.
#[unsafe(no_mangle)]
pub extern "C" fn dlerror() -> *mut c_char {
ERROR.swap(0, Ordering::SeqCst) as *mut c_char