ash: skip poll in read built-in

GNUlib poll doesn't seem to work when the file descriptor refers
to a file on disk.  This may not be surprising given the warning
in the Windows API documentation against using disk file handles
in calls to WaitForSingleObject.

Skipping poll in the read built-in allows file redirection to
work and doesn't make interrupt handling any worse than it was
before.

1 files changed, 2 insertions, 0 deletions

diff --git a/shell/shell_common.c b/shell/shell_common.c
index 4c870fab8..2244a3c97 100644
--- a/shell/shell_common.c
+++ b/shell/shell_common.c
@@ -190,6 +190,7 @@ shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val),
                  * regardless of SA_RESTART-ness of that signal!
                  */
                 errno = 0;
+#if !ENABLE_PLATFORM_MINGW32
                 pfd[0].fd = fd;
                 pfd[0].events = POLLIN;
                 if (poll(pfd, 1, timeout) != 1) {
@@ -198,6 +199,7 @@ shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val),
                         retval = (const char *)(uintptr_t)1;
                         goto ret;
                 }
+#endif
                 if (read(fd, &buffer[bufpos], 1) != 1) {
                         err = errno;
                         retval = (const char *)(uintptr_t)1;