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diff --git a/src/common/safe_io.h b/src/common/safe_io.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#ifndef CEPH_SAFE_IO
+#define CEPH_SAFE_IO
+
+#include "common/compiler_extensions.h"
+#include <sys/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+ /*
+ * Safe functions wrapping the raw read() and write() libc functions.
+ * These retry on EINTR, and on error return -errno instead of returning
+ * -1 and setting errno).
+ *
+ * On Windows, only recv/send work with sockets.
+ */
+ ssize_t safe_read(int fd, void *buf, size_t count)
+ WARN_UNUSED_RESULT;
+ ssize_t safe_write(int fd, const void *buf, size_t count)
+ WARN_UNUSED_RESULT;
+ ssize_t safe_recv(int fd, void *buf, size_t count)
+ WARN_UNUSED_RESULT;
+ ssize_t safe_send(int fd, const void *buf, size_t count)
+ WARN_UNUSED_RESULT;
+ ssize_t safe_pread(int fd, void *buf, size_t count, off_t offset)
+ WARN_UNUSED_RESULT;
+ ssize_t safe_pwrite(int fd, const void *buf, size_t count, off_t offset)
+ WARN_UNUSED_RESULT;
+#ifdef CEPH_HAVE_SPLICE
+ /*
+ * Similar to the above (non-exact version) and below (exact version).
+ * See splice(2) for parameter descriptions.
+ */
+ ssize_t safe_splice(int fd_in, off_t *off_in, int fd_out, off_t *off_out,
+ size_t len, unsigned int flags)
+ WARN_UNUSED_RESULT;
+ ssize_t safe_splice_exact(int fd_in, off_t *off_in, int fd_out,
+ off_t *off_out, size_t len, unsigned int flags)
+ WARN_UNUSED_RESULT;
+#endif
+
+ /*
+ * Same as the above functions, but return -EDOM unless exactly the requested
+ * number of bytes can be read.
+ */
+ ssize_t safe_read_exact(int fd, void *buf, size_t count)
+ WARN_UNUSED_RESULT;
+ ssize_t safe_recv_exact(int fd, void *buf, size_t count)
+ WARN_UNUSED_RESULT;
+ ssize_t safe_pread_exact(int fd, void *buf, size_t count, off_t offset)
+ WARN_UNUSED_RESULT;
+
+
+ /*
+ * Safe functions to read and write an entire file.
+ */
+ int safe_write_file(const char *base, const char *file,
+ const char *val, size_t vallen,
+ unsigned mode);
+ int safe_read_file(const char *base, const char *file,
+ char *val, size_t vallen);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif