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os: getrandom wrapper favoring it for macOs/iOs only

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This commit is contained in:
David CARLIER 2023-04-16 15:49:42 +01:00
parent c579a23c5d
commit 6248ac535b
1 changed files with 13 additions and 2 deletions
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15
lib/std/os.zig
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@ -512,7 +512,18 @@ pub fn getrandom(buffer: []u8) GetRandomError!void {
return;
}
switch (builtin.os.tag) {
.netbsd, .openbsd, .macos, .ios, .tvos, .watchos => {
.macos, .ios => {
const rc = darwin.CCRandomGenerateBytes(buffer.ptr, buffer.len);
if (rc != darwin.CCRNGStatus.kCCSuccess) {
if (rc == darwin.CCRNGStatus.kCCParamError or rc == darwin.CCRNGStatus.kCCBufferTooSmall) {
return error.InvalidHandle;
} else {
return error.SystemResources;
}
}
return;
},
.netbsd, .openbsd, .tvos, .watchos => {
system.arc4random_buf(buffer.ptr, buffer.len);
return;
},
@ -991,7 +1002,7 @@ pub fn preadv(fd: fd_t, iov: []const iovec, offset: u64) PReadError!usize {
if (have_pread_but_not_preadv) {
// We could loop here; but proper usage of `preadv` must handle partial reads anyway.
// So we simply read into the first vector only.
if (iov.len == 0) return @as(usize, 0);
if (iov.len == 0) return @intCast(usize, 0);
const first = iov[0];
return pread(fd, first.iov_base[0..first.iov_len], offset);
}