When messing with fd NONBLOCK status, put things back the way we found

them afterwards.  As was, this hosed things up for fds shared with a
parent process.  Very bad for shells...  Oops.
 -Erik

diff --git a/libc/stdio/stdio.c b/libc/stdio/stdio.c
index 3f475ae..63fb6bd 100644 (file)
--- a/libc/stdio/stdio.c
+++ b/libc/stdio/stdio.c
@@ -203,8 +203,11 @@ void __stdio_flush_buffers(void)
        if (WRITEABLE(fp)) {
            /* Set the underlying fd to non-block mode to ensure
             * that calls to _exit() and abort() will not block */
-           fcntl(fp->fd, F_SETFL, O_NONBLOCK);
+           long flags;
+           fcntl(fp->fd, F_GETFL, &flags);
+           fcntl(fp->fd, F_SETFL, flags|O_NONBLOCK);
            fflush(fp);
+           fcntl(fp->fd, F_SETFL, flags);
        }
     }
 }