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std.posix: untangle getRandomBytesDevURandom from Io.Reader

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This commit is contained in:
Andrew Kelley 2025-10-19 22:31:52 -07:00
parent 97bde94e36
commit 894cb5a1fc
1 changed files with 9 additions and 5 deletions
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14
lib/std/posix.zig
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@ -666,18 +666,22 @@ pub fn getrandom(buffer: []u8) GetRandomError!void {
return getRandomBytesDevURandom(buffer);
}
fn getRandomBytesDevURandom(buf: []u8) !void {
fn getRandomBytesDevURandom(buf: []u8) GetRandomError!void {
const fd = try openZ("/dev/urandom", .{ .ACCMODE = .RDONLY, .CLOEXEC = true }, 0);
defer close(fd);
const st = try fstat(fd);
const st = fstat(fd) catch |err| switch (err) {
error.Streaming => return error.NoDevice,
else => |e| return e,
};
if (!S.ISCHR(st.mode)) {
return error.NoDevice;
}
const file: fs.File = .{ .handle = fd };
var file_reader = file.readerStreaming(&.{});
file_reader.interface.readSliceAll(buf) catch return error.Unexpected;
var i: usize = 0;
while (i < buf.len) {
i += read(fd, buf[i..]) catch return error.Unexpected;
}
}
/// Causes abnormal process termination.