1 files changed, 16 insertions, 0 deletions
diff --git a/src/lib/sendfile-util.h b/src/lib/sendfile-util.h
new file mode 100644
index 0000000..3d7f14a
--- /dev/null
+++ b/src/lib/sendfile-util.h
@@ -0,0 +1,16 @@
+#ifndef SENDFILE_UTIL_H
+#define SENDFILE_UTIL_H
+
+/* Wrapper for various sendfile()-like calls. Read a maximum of count bytes
+   from the given offset in in_fd and write them to out_fd. The offset is
+   updated after the call. Note the call assert-crashes if count is 0.
+
+   Returns:
+   >0 number of bytes successfully written (maybe less than count)
+   0 if offset points to the input's EOF or past it
+   -1, errno=EINVAL if it isn't supported for some reason (out_fd isn't a
+       socket or there simply is no sendfile()).
+   -1, errno=EAGAIN if non-blocking write couldn't send anything */
+ssize_t safe_sendfile(int out_fd, int in_fd, uoff_t *offset, size_t count);
+
+#endif