bjoernager/rust
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Use a const for getentropy(2)'s syscall number

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Reported by Sebastien Marie.
This commit is contained in:
Michael McConville 2015-12-17 00:21:11 -05:00
parent a51b70b816
commit 3ee3a784bf
1 changed files with 5 additions and 1 deletions
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6
src/libstd/rand/os.rs
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@ -208,6 +208,8 @@ mod imp {
fn syscall(number: c_long, ...) -> c_long; fn syscall(number: c_long, ...) -> c_long;
} }
const NR_GETENTROPY: libc::c_long = 7;
impl OsRng { impl OsRng {
/// Create a new `OsRng`. /// Create a new `OsRng`.
pub fn new() -> io::Result<OsRng> { pub fn new() -> io::Result<OsRng> {
@ -231,7 +233,9 @@ mod imp {
// getentropy(2) permits a maximum buffer size of 256 bytes // getentropy(2) permits a maximum buffer size of 256 bytes
for s in v.chunks_mut(256) { for s in v.chunks_mut(256) {
unsafe { ret = syscall(7, s.as_mut_ptr(), s.len()); } unsafe {
ret = syscall(NR_GETENTROPY, s.as_mut_ptr(), s.len());
}
if ret == -1 { if ret == -1 {
panic!("unexpected getentropy error: {}", errno()); panic!("unexpected getentropy error: {}", errno());
} }