open: fix truncating on read only open

Also note another point where we need to fix up refcount handling for FIFO
nodes

diff --git a/Kernel/syscall_fs3.c b/Kernel/syscall_fs3.c
index 634c9c6..17725a6 100644 (file)
--- a/Kernel/syscall_fs3.c
+++ b/Kernel/syscall_fs3.c
@@ -113,7 +113,7 @@ arg_t _open(void)
                ino = *iptr;
        }
 
-       if (trunc && getmode(ino) == MODE_R(F_REG)) {
+       if (w && trunc && getmode(ino) == MODE_R(F_REG)) {
                if (f_trunc(ino))
                        goto idrop;
                for (j = 0; j < OFTSIZE; ++j)
@@ -136,7 +136,8 @@ arg_t _open(void)
 
        /* FIXME: ATIME ? */
 /*
- *         Sleep process if no writer or reader
+ *         Sleep process if no writer or reader.
+ *        FIXME: check for other of pair now we have proper counts
  */
        if (getmode(ino) == MODE_R(F_PIPE) && of_tab[oftindex].o_refs == 1
            && !(flag & O_NDELAY))