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Explicit extern "C" ABI for FFI #520

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Merged
JohnTitor merged 1 commit into from
Feb 26, 2026
Merged

Explicit extern "C" ABI for FFI #520

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12 changes: 6 additions & 6 deletions src/ffi.md
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Original file line number Diff line number Diff line change
Expand Up @@ -356,7 +356,7 @@ extern fn callback(a: i32) {
}

#[link(name = "extlib")]
unsafe extern {
unsafe extern "C" {
fn register_callback(cb: extern fn(i32)) -> i32;
fn trigger_callback();
}
Expand Down Expand Up @@ -417,9 +417,9 @@ unsafe extern "C" fn callback(target: *mut RustObject, a: i32) {
}

#[link(name = "extlib")]
unsafe extern {
unsafe extern "C" {
fn register_callback(target: *mut RustObject,
cb: unsafe extern fn(*mut RustObject, i32)) -> i32;
cb: unsafe extern "C" fn(*mut RustObject, i32)) -> i32;
fn trigger_callback();
}

Expand Down Expand Up @@ -548,7 +548,7 @@ blocks with the `static` keyword:
<!-- ignore: requires libc crate -->
```rust,ignore
#[link(name = "readline")]
unsafe extern {
unsafe extern "C" {
static rl_readline_version: libc::c_int;
}

Expand All @@ -568,7 +568,7 @@ use std::ffi::CString;
use std::ptr;

#[link(name = "readline")]
unsafe extern {
unsafe extern "C" {
static mut rl_prompt: *const libc::c_char;
}

Expand Down Expand Up @@ -659,7 +659,7 @@ In C, functions can be 'variadic', meaning they accept a variable number of argu
be achieved in Rust by specifying `...` within the argument list of a foreign function declaration:

```no_run
unsafe extern {
unsafe extern "C" {
fn foo(x: i32, ...);
}

Expand Down