- /* set the non-blocking flag on this file descriptor */
- fd_flags = fcntl(fd, F_GETFL);
- fcntl(fd, F_SETFL, fd_flags | O_NONBLOCK);
+ /* Set the non-blocking flag on this file descriptor.
+ *
+ * Don't do it for stdout and stderr: some shells (actually most)
+ * don't reset the nonblocking flag after running a program, and
+ * this causes all sorts of problems. --SDM (12/99)
+ *
+ * MS Win32 CRT doesn't support fcntl() -- the workaround is to
+ * start using 'completion ports', but I'm punting on implementing
+ * support for using those.
+ */
+ if (fd != 1 && fd != 2) {
+ fd_flags = fcntl(fd, F_GETFL);
+ fcntl(fd, F_SETFL, fd_flags | O_NONBLOCK);
+ }