David Laight reports that sometimes reads on a serial port will

attempt to block, and hence return EAGAIN/EWOULDBLOCK, in spite of
the port having been reported readable by select(2). Don't treat
those errors as fatal.

[originally from svn r9020]

diff --git a/unix/uxser.c b/unix/uxser.c
index 92961a7de9928c5bcc7972d524e6cc8785c9820c..22f4a0654e3859ba6c5c0c0294f31e1df65357f7 100644 (file)
--- a/unix/uxser.c
+++ b/unix/uxser.c
@@ -342,6 +342,14 @@ static int serial_select_result(int fd, int event)
             */
            finished = TRUE;
        } else if (ret < 0) {
+#ifdef EAGAIN
+           if (errno == EAGAIN)
+               return 1;              /* spurious */
+#endif
+#ifdef EWOULDBLOCK
+           if (errno == EWOULDBLOCK)
+               return 1;              /* spurious */
+#endif
            perror("read serial port");
            exit(1);
        } else if (ret > 0) {