Fixed a minor select bug:

 - When one does a select on a file descriptor that is meaningless for that particular file type, select shall indicate that the file descriptor is ready for that particular operation and that the file descriptor has no exceptional condition pending.

diff --git a/servers/vfs/pipe.c b/servers/vfs/pipe.c
index f80f028321c74a024f3179e6d5246f774b09ac99..03f9e45f8dd90d53fb9bacccb0de0c43fc32458a 100644 (file)
--- a/servers/vfs/pipe.c
+++ b/servers/vfs/pipe.c
@@ -574,6 +574,12 @@ PUBLIC int select_request_pipe(struct filp *f, int *ops, int block)
                        r |= SEL_RD;
                if (err < 0 && err != SUSPEND)
                        r |= SEL_ERR;
+               if(err == SUSPEND && f->filp_mode & W_BIT) {
+                        /* A "meaningless" read select, therefore ready
+                           for reading and no error set. */
+                       r |= SEL_RD; 
+                       r &= ~SEL_ERR;
+                }
        }
        if ((*ops & (SEL_WR|SEL_ERR))) {
                if ((err = Xpipe_check(f->filp_vno, WRITING, 0,
@@ -581,6 +587,12 @@ PUBLIC int select_request_pipe(struct filp *f, int *ops, int block)
                        r |= SEL_WR;
                if (err < 0 && err != SUSPEND)
                        r |= SEL_ERR;
+               if(err == SUSPEND && f->filp_mode & R_BIT) {
+                        /* A "meaningless" write select, therefore ready
+                           for reading and no error set. */
+                       r |= SEL_WR; 
+                       r &= ~SEL_ERR;
+                }
        }
 
        /* Some options we collected might not be requested. */