From a33dd2293f619f4bdab65fbb89c29f9ac2279cc4 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@operamail.com>
Date: Wed, 7 May 2014 01:13:31 +0200
Subject: misc
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Signed-off-by: Mattias Andrée <maandree@operamail.com>
---
 src/libmdsserver/util.c | 39 +++++++++++++++++++++++++++++++++++++++
 src/libmdsserver/util.h | 13 +++++++++++++
 2 files changed, 52 insertions(+)

(limited to 'src/libmdsserver')

diff --git a/src/libmdsserver/util.c b/src/libmdsserver/util.c
index 81793ae..b8b61d3 100644
--- a/src/libmdsserver/util.c
+++ b/src/libmdsserver/util.c
@@ -17,12 +17,15 @@
  */
 #include "util.h"
 #include "config.h"
+#include "macros.h"
 
 #include <stdlib.h>
 #include <unistd.h>
 #include <limits.h>
 #include <string.h>
 #include <signal.h>
+#include <sys/socket.h>
+#include <errno.h>
 
 
 /**
@@ -106,3 +109,39 @@ int xsigaction(int signo, void (*function)(int signo))
   return sigaction(signo, &action, NULL);
 }
 
+
+/**
+ * Send a message over a socket
+ * 
+ * @param   socket   The file descriptor of the socket
+ * @param   message  The message to send
+ * @param   length   The length of the message
+ * @return           The number of bytes that have been sent (even on error)
+ */
+size_t send_message(int socket, const char* message, size_t length)
+{
+  size_t block_size = length;
+  size_t sent = 0;
+  ssize_t just_sent;
+  
+  while (length > 0)
+    if ((just_sent = send(socket, message, min(block_size, length), MSG_NOSIGNAL)) < 0)
+      {
+	if (errno == EMSGSIZE)
+	  {
+	    block_size >>= 1;
+	    if (block_size == 0)
+	      return sent;
+	  }
+	else if (errno != EINTR)
+	  return sent;
+      }
+    else
+      {
+	message += (size_t)just_sent;
+	length -= (size_t)just_sent;
+      }
+  
+  return sent;
+}
+
diff --git a/src/libmdsserver/util.h b/src/libmdsserver/util.h
index 8bfaa71..3a6e9b1 100644
--- a/src/libmdsserver/util.h
+++ b/src/libmdsserver/util.h
@@ -19,6 +19,9 @@
 #define MDS_LIBMDSSERVER_UTIL_H
 
 
+#include <stddef.h>
+
+
 /**
  * Read an environment variable, but handle it as undefined if empty
  * 
@@ -50,6 +53,16 @@ void reexec_server(int argc, char** argv, int reexeced);
  */
 int xsigaction(int signo, void (*function)(int signo));
 
+/**
+ * Send a message over a socket
+ * 
+ * @param   socket   The file descriptor of the socket
+ * @param   message  The message to send
+ * @param   length   The length of the message
+ * @return           The number of bytes that have been sent (even on error)
+ */
+size_t send_message(int socket, const char* message, size_t length);
+
 
 #endif
 
-- 
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