Add posix_fadvise and posix_fadvise64 for powerpc

The syscall is having different number of params
and in one case the parameters are passed in differently.
This patch add powerpc specific versions of these
functions.

Signed-off-by: Khem Raj <raj.khem@gmail.com>

libc/sysdeps/linux/powerpc/posix_fadvise.c

@@ -0,0 +1,36 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * posix_fadvise() for uClibc
+ * http://www.opengroup.org/onlinepubs/009695399/functions/posix_fadvise.html
+ *
+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+#include <fcntl.h>
+
+#ifdef __NR_fadvise64
+#define __NR_posix_fadvise __NR_fadvise64
+int posix_fadvise(int fd, off_t offset, off_t len, int advice)
+{
+	INTERNAL_SYSCALL_DECL(err);
+	int ret = (int) (INTERNAL_SYSCALL(posix_fadvise, err, 6, fd, 0,
+	 __LONG_LONG_PAIR (offset >> 31, offset), len, advice));
+    if (INTERNAL_SYSCALL_ERROR_P (ret, err))
+      return INTERNAL_SYSCALL_ERRNO (ret, err);
+    return 0;
+}
+
+#if defined __UCLIBC_HAS_LFS__ && (!defined __NR_fadvise64_64 || !defined _syscall6)
+strong_alias(posix_fadvise,posix_fadvise64)
+#endif
+
+#else
+int posix_fadvise(int fd attribute_unused, off_t offset attribute_unused, off_t len attribute_unused, int advice attribute_unused)
+{
+#warning This is not correct as far as SUSv3 is concerned.
+	return ENOSYS;
+}
+#endif

libc/sysdeps/linux/powerpc/posix_fadvise64.c

@@ -0,0 +1,70 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * posix_fadvise64() for uClibc
+ * http://www.opengroup.org/onlinepubs/009695399/functions/posix_fadvise.html
+ *
+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <features.h>
+#include <unistd.h>
+#include <errno.h>
+#include <endian.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <fcntl.h>
+
+#ifdef __UCLIBC_HAS_LFS__
+#ifdef __NR_fadvise64_64
+
+/* 64 bit implementation is cake ... or more like pie ... */
+#if __WORDSIZE == 64
+
+#define __NR_posix_fadvise64 __NR_fadvise64_64
+
+int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
+{
+  if (len != (off_t) len)
+    return EOVERFLOW;
+  INTERNAL_SYSCALL_DECL (err);
+    int ret = INTERNAL_SYSCALL (posix_fadvise64, err, 6, fd, 0,
+                               __LONG_LONG_PAIR ((long) (offset >> 32),
+                                                 (long) offset),
+                               (off_t) len, advice);
+  if (!INTERNAL_SYSCALL_ERROR_P (ret, err))
+    return 0;
+  return INTERNAL_SYSCALL_ERRNO (ret, err);
+}
+
+/* 32 bit implementation is kind of a pita */
+#elif __WORDSIZE == 32
+
+int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
+{
+	INTERNAL_SYSCALL_DECL (err);
+	int ret = INTERNAL_SYSCALL (fadvise64_64, err, 6, fd, advise,
+								__LONG_LONG_PAIR(offset >> 32, offset &  0xffffffff),
+								__LONG_LONG_PAIR(len >> 32, len & 0xffffffff));
+	if (!INTERNAL_SYSCALL_ERROR_P (ret, err))
+		return 0;
+	return INTERNAL_SYSCALL_ERRNO (ret, err);
+}
+
+#else
+#error your machine is neither 32 bit or 64 bit ... it must be magical
+#endif
+
+#elif !defined __NR_fadvise64
+/* This is declared as a strong alias in posix_fadvise.c if __NR_fadvise64
+ * is defined.
+ */
+int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
+{
+#warning This is not correct as far as SUSv3 is concerned.
+	return ENOSYS;
+}
+#endif /* __NR_fadvise64_64 */
+#endif /* __UCLIBC_HAS_LFS__ */