xz: Fix comments.

diff --git a/src/xz/file_io.c b/src/xz/file_io.c
index 7895ee0183a45fc33c4da8785abfc864fb56b794..c52656c10ef822149ecd4dc16c635bccf0955ec0 100644 (file)
--- a/src/xz/file_io.c
+++ b/src/xz/file_io.c
@@ -393,10 +393,11 @@ io_open_src_real(file_pair *pair)
 #ifdef TUKLIB_DOSLIKE
                setmode(STDIN_FILENO, O_BINARY);
 #else
-               // Try to set stdout to non-blocking mode. It won't work
+               // Try to set stdin to non-blocking mode. It won't work
                // e.g. on OpenBSD if stdout is e.g. /dev/null. In such
-               // case we proceed as if stdout were non-blocking anyway
-               // (in case of /dev/null it will be in practice).
+               // case we proceed as if stdin were non-blocking anyway
+               // (in case of /dev/null it will be in practice). The
+               // same applies to stdout in io_open_dest_real().
                stdin_flags = fcntl(STDIN_FILENO, F_GETFL);
                if (stdin_flags == -1) {
                        message_error(_("Error getting the file status flags "
@@ -701,7 +702,10 @@ io_open_dest_real(file_pair *pair)
 #ifdef TUKLIB_DOSLIKE
                setmode(STDOUT_FILENO, O_BINARY);
 #else
-               // Set O_NONBLOCK if it isn't already set.
+               // Try to set O_NONBLOCK if it isn't already set.
+               // If it fails, we assume that stdout is non-blocking
+               // in practice. See the comments in io_open_src_real()
+               // for similar situation with stdin.
                //
                // NOTE: O_APPEND may be unset later in this function
                // and it relies on stdout_flags being set here.