zig

commit c0c228b758150e017185dc280ef020ec3b7efdcf (tree)
parent 6cb4cac5cd1c68f41c62a3c23b09513988337c8d
Author: Euan Torano <euantorano@gmail.com>
Date:   Fri,  2 Aug 2019 13:19:49 +0100

Check if /dev/urandom is a character device

Diffstat:
M
std/os.zig
 | 
5
+++++

1 file changed, 5 insertions(+), 0 deletions(-)
diff --git a/std/os.zig b/std/os.zig
@@ -133,6 +133,11 @@ fn getRandomBytesDevURandom(buf: []u8) !void {
     const fd = try openC(c"/dev/urandom", O_RDONLY | O_CLOEXEC, 0);
     defer close(fd);
 
+    const st = try fstat(fd);
+    if (!S_ISCHR(st.mode)) {
+        return OpenError.Unexpected;
+    }
+
     const stream = &std.fs.File.openHandle(fd).inStream().stream;
     stream.readNoEof(buf) catch return error.Unexpected;
 }