libc: add posix_fallocate()

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/common/posix_fallocate64.c b/libc/sysdeps/linux/common/posix_fallocate64.c
new file mode 100644
index 000000000..818d86884
--- /dev/null
+++ b/libc/sysdeps/linux/common/posix_fallocate64.c
@@ -0,0 +1,39 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * posix_fallocate() for uClibc
+ * http://www.opengroup.org/onlinepubs/9699919799/functions/posix_fallocate.html
+ *
+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+#include <fcntl.h>
+#include <bits/kernel-features.h>
+#include <stdint.h>
+
+#if defined __NR_fallocate
+
+# if __WORDSIZE == 64
+/* Can use normal posix_fallocate() */
+# elif __WORDSIZE == 32
+int posix_fallocate64(int fd, __off64_t offset, __off64_t len)
+{
+	int ret;
+	uint32_t off_low = offset & 0xffffffff;
+	uint32_t off_high = offset >> 32;
+	uint32_t len_low = len & 0xffffffff;
+	uint32_t len_high = len >> 32;
+	INTERNAL_SYSCALL_DECL(err);
+	ret = (int) (INTERNAL_SYSCALL(fallocate, err, 6, fd, 0,
+		__LONG_LONG_PAIR (off_high, off_low),
+		__LONG_LONG_PAIR (len_high, len_low)));
+    if (unlikely(INTERNAL_SYSCALL_ERROR_P (ret, err)))
+      return INTERNAL_SYSCALL_ERRNO (ret, err);
+    return 0;
+}
+# else
+# error your machine is neither 32 bit or 64 bit ... it must be magical
+# endif
+#endif