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[fuchsia] Update zx_cprng_draw to target semantics #51850

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Merged
merged 1 commit into from
Jun 27, 2018
Merged

[fuchsia] Update zx_cprng_draw to target semantics #51850

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28 changes: 2 additions & 26 deletions src/libstd/sys/unix/rand.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -183,34 +183,10 @@ mod imp {
mod imp {
#[link(name = "zircon")]
extern {
fn zx_cprng_draw_new(buffer: *mut u8, len: usize) -> i32;
}

fn getrandom(buf: &mut [u8]) -> Result<usize, i32> {
unsafe {
let status = zx_cprng_draw_new(buf.as_mut_ptr(), buf.len());
if status == 0 {
Ok(buf.len())
} else {
Err(status)
}
}
fn zx_cprng_draw(buffer: *mut u8, len: usize);
}

pub fn fill_bytes(v: &mut [u8]) {
let mut buf = v;
while !buf.is_empty() {
let ret = getrandom(buf);
match ret {
Err(err) => {
panic!("kernel zx_cprng_draw call failed! (returned {}, buf.len() {})",
err, buf.len())
}
Ok(actual) => {
let move_buf = buf;
buf = &mut move_buf[(actual as usize)..];
}
}
}
unsafe { zx_cprng_draw(v.as_mut_ptr(), v.len()) }
}
}