19 lines
628 B
Rust
19 lines
628 B
Rust
//! Implementation for Emscripten
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use crate::{util_libc::last_os_error, Error};
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use core::mem::MaybeUninit;
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// Not yet defined in libc crate.
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extern "C" {
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fn getentropy(buffer: *mut libc::c_void, length: usize) -> libc::c_int;
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}
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pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
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// Emscripten 2.0.5 added getentropy, so we can use it unconditionally.
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// Unlike other getentropy implementations, there is no max buffer length.
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let ret = unsafe { getentropy(dest.as_mut_ptr() as *mut libc::c_void, dest.len()) };
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if ret < 0 {
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return Err(last_os_error());
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}
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Ok(())
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}
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