Imported from ../bash-4.0-rc1.tar.gz.

lib/sh/ufuncs.c

@@ -0,0 +1,104 @@
+/* ufuncs - sleep and alarm functions that understand fractional values */
+
+/* Copyright (C) 2008,2009 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Bash is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "config.h"
+
+#include "bashtypes.h"
+
+#if defined (TIME_WITH_SYS_TIME)
+#  include <sys/time.h>
+#  include <time.h>
+#else
+#  if defined (HAVE_SYS_TIME_H)
+#    include <sys/time.h>
+#  else
+#    include <time.h>
+#  endif
+#endif
+
+#if defined (HAVE_UNISTD_H)
+#include <unistd.h>
+#endif
+
+/* A version of `alarm' using setitimer if it's available. */
+
+#if defined (HAVE_SETITIMER)
+unsigned int
+falarm(secs, usecs)
+     unsigned int secs, usecs;
+{
+  struct itimerval it, oit;
+
+  it.it_interval.tv_sec = 0;
+  it.it_interval.tv_usec = 0;
+
+  it.it_value.tv_sec = secs;
+  it.it_value.tv_usec = usecs;
+
+  if (setitimer(ITIMER_REAL, &it, &oit) < 0)
+    return (-1);		/* XXX will be converted to unsigned */
+
+  /* Backwards compatibility with alarm(3) */
+  if (oit.it_value.tv_usec)
+    oit.it_value.tv_sec++;
+  return (oit.it_value.tv_sec);
+}
+#else
+int
+falarm (secs, usecs)
+     unsigned int secs, usecs;
+{
+  if (secs == 0 && usecs == 0)
+    return (alarm (0));
+
+  if (secs == 0 || usecs >= 500000)
+    {
+      secs++;
+      usecs = 0;
+    }
+  return (alarm (secs));
+}
+#endif /* !HAVE_SETITIMER */
+
+/* A version of sleep using fractional seconds and select.  I'd like to use
+   `usleep', but it's already taken */
+
+#if defined (HAVE_TIMEVAL) && defined (HAVE_SELECT)
+int
+fsleep(sec, usec)
+     unsigned int sec, usec;
+{
+  struct timeval tv;
+
+  tv.tv_sec = sec;
+  tv.tv_usec = usec;
+
+  return select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv);
+}
+#else /* !HAVE_TIMEVAL || !HAVE_SELECT */
+int
+fsleep(sec, usec)
+     long sec, usec;
+{
+  if (usec >= 500000)	/* round */
+   sec++;
+  return (sleep(sec));
+}
+#endif /* !HAVE_TIMEVAL || !HAVE_SELECT */