1 files changed, 96 insertions, 0 deletions
diff --git a/gnu/libexec/uucp/libunix/pause.c b/gnu/libexec/uucp/libunix/pause.c
new file mode 100644
index 000000000000..e774e0897bf2
--- /dev/null
+++ b/gnu/libexec/uucp/libunix/pause.c
@@ -0,0 +1,96 @@
+/* pause.c
+   Pause for half a second.  */
+
+#include "uucp.h"
+
+#include "sysdep.h"
+#include "system.h"
+
+/* Pick a timing routine to use.  I somewhat arbitrarily picked usleep
+   above nap above napms above poll above select.  */
+#if HAVE_USLEEP || HAVE_NAP || HAVE_NAPMS || HAVE_POLL
+#undef HAVE_SELECT
+#define HAVE_SELECT 0
+#endif
+
+#if HAVE_USLEEP || HAVE_NAP || HAVE_NAPMS
+#undef HAVE_POLL
+#define HAVE_POLL 0
+#endif
+
+#if HAVE_USLEEP || HAVE_NAP
+#undef HAVE_NAPMS
+#define HAVE_NAPMS 0
+#endif
+
+#if HAVE_USLEEP
+#undef HAVE_NAP
+#define HAVE_NAP 0
+#endif
+
+#if HAVE_SELECT
+#include <sys/time.h>
+#if HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+#endif
+
+#if HAVE_POLL
+#if HAVE_STROPTS_H
+#include <stropts.h>
+#endif
+#if HAVE_POLL_H
+#include <poll.h>
+#endif
+#if ! HAVE_STROPTS_H && ! HAVE_POLL_H
+/* We need a definition for struct pollfd, although it doesn't matter
+   what it contains.  */
+struct pollfd
+{
+  int idummy;
+};
+#endif /* ! HAVE_STROPTS_H && ! HAVE_POLL_H */
+#endif /* HAVE_POLL */
+
+#if HAVE_TIME_H
+#if HAVE_SYS_TIME_AND_TIME_H || ! USE_SELECT_TIMER
+#include <time.h>
+#endif
+#endif
+
+void
+usysdep_pause ()
+{
+#if HAVE_NAPMS
+  napms (500);
+#endif /* HAVE_NAPMS */
+#if HAVE_NAP
+#if HAVE_HUNDREDTHS_NAP
+  nap (50L);
+#else
+  nap (500L);
+#endif /* ! HAVE_HUNDREDTHS_NAP */
+#endif /* HAVE_NAP */
+#if HAVE_USLEEP
+  usleep (500 * (long) 1000);
+#endif /* HAVE_USLEEP */
+#if HAVE_POLL
+  struct pollfd sdummy;
+
+  /* We need to pass an unused pollfd structure because poll checks
+     the address before checking the number of elements.  */
+  poll (&sdummy, 0, 500);
+#endif /* HAVE_POLL */
+#if HAVE_SELECT
+  struct timeval s;
+
+  s.tv_sec = 0;
+  s.tv_usec = 500 * (long) 1000;
+  select (0, (pointer) NULL, (pointer) NULL, (pointer) NULL, &s);
+#endif /* USE_SELECT_TIMER */
+#if ! HAVE_NAPMS && ! HAVE_NAP && ! HAVE_USLEEP
+#if ! USE_SELECT_TIMER && ! HAVE_POLL
+  sleep (1);
+#endif /* ! USE_SELECT_TIMER && ! HAVE_POLL */
+#endif /* ! HAVE_NAPMS && ! HAVE_NAP && ! HAVE_USLEEP */
+}