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Rollup merge of #37589 - raphlinus:fuchsia_random, r=alexcrichton

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std: Track change to cprng syscall signature (Fuchsia)

The mx_cprng_draw syscall has changed signature to separate the status
and size return values, rather than multiplexing them into a single
value with errors interpreted as a negative value. This patch tracks
that change.
This commit is contained in:
Alex Crichton 2016-11-04 16:49:33 -07:00
commit 8e5c91a6fb
1 changed files with 20 additions and 8 deletions
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24
src/libstd/sys/unix/rand.rs
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@ -350,11 +350,19 @@ mod imp {
#[link(name = "magenta")]
extern {
fn mx_cprng_draw(buffer: *mut u8, len: usize) -> isize;
fn mx_cprng_draw(buffer: *mut u8, len: usize, actual: *mut usize) -> i32;
}
fn getrandom(buf: &mut [u8]) -> isize {
unsafe { mx_cprng_draw(buf.as_mut_ptr(), buf.len()) }
fn getrandom(buf: &mut [u8]) -> Result<usize, i32> {
unsafe {
let mut actual = 0;
let status = mx_cprng_draw(buf.as_mut_ptr(), buf.len(), &mut actual);
if status == 0 {
Ok(actual)
} else {
Err(status)
}
}
}
pub struct OsRng {
@ -381,12 +389,16 @@ mod imp {
let mut buf = v;
while !buf.is_empty() {
let ret = getrandom(buf);
if ret < 0 {
match ret {
Err(err) => {
panic!("kernel mx_cprng_draw call failed! (returned {}, buf.len() {})",
ret, buf.len());
err, buf.len())
}
Ok(actual) => {
let move_buf = buf;
buf = &mut move_buf[(ret as usize)..];
buf = &mut move_buf[(actual as usize)..];
}
}
}
}
}