1 files changed, 52 insertions, 0 deletions
diff --git a/sysdeps/posix/nice.c b/sysdeps/posix/nice.c
new file mode 100644
index 0000000..b986ffb
--- /dev/null
+++ b/sysdeps/posix/nice.c
@@ -0,0 +1,52 @@
+/* Copyright (C) 1992, 1996, 1997, 2001, 2002, 2006
+   Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <unistd.h>
+#include <sys/resource.h>
+
+/* Increment the scheduling priority of the calling process by INCR.
+   The superuser may use a negative INCR to decrement the priority.  */
+int
+nice (int incr)
+{
+  int save;
+  int prio;
+  int result;
+
+  /* -1 is a valid priority, so we use errno to check for an error.  */
+  save = errno;
+  __set_errno (0);
+  prio = getpriority (PRIO_PROCESS, 0);
+  if (prio == -1)
+    {
+      if (errno != 0)
+	return -1;
+      else
+	__set_errno (save);
+    }
+
+  result = setpriority (PRIO_PROCESS, 0, prio + incr);
+  if (result == -1)
+    {
+      if (errno == EACCES)
+	errno = EPERM;
+      return -1;
+    }
+  return getpriority (PRIO_PROCESS, 0);
+}