Fixed up all references to zmq_msg_size

doc/zmq_msg_size.txt

@@ -9,7 +9,7 @@ zmq_msg_size - retrieve message content size in bytes
 
 SYNOPSIS
 --------
-*size_t zmq_msg_size (zmq_msg_t '*msg');*
+*ssize_t zmq_msg_size (zmq_msg_t '*msg');*
 
 
 DESCRIPTION
@@ -29,7 +29,15 @@ message content in bytes.
 
 ERRORS
 ------
-No errors are defined.
+The _zmq_msg_size()_ function shall return a positive integer (0 or higher)
+if successful. Otherwise it shall return `-1` and set 'errno' to one of the
+values defined below.
+
+
+ERRORS
+------
+*EFAULT*::
+The provided 'msg' was NULL.
 
 
 SEE ALSO
@@ -44,5 +52,5 @@ linkzmq:zmq[7]
 
 AUTHORS
 -------
-This 0MQ manual page was written by Martin Sustrik <sustrik@250bpm.com> and
-Martin Lucina <mato@kotelna.sk>.
+This 0MQ manual page was written by Martin Sustrik <sustrik@250bpm.com>,
+Martin Lucina <mato@kotelna.sk>, and Pieter Hintjens <ph@imatix.com>.

include/zmq.h

@@ -29,6 +29,7 @@ extern "C" {
 
 #include <errno.h>
 #include <stddef.h>
+#include <stdio.h>
 #if defined _WIN32
 #include <winsock2.h>
 #endif

perf/inproc_lat.cpp

 /*
+    Copyright (c) 2007-2012 iMatix Corporation
     Copyright (c) 2009-2011 250bpm s.r.o.
-    Copyright (c) 2007-2009 iMatix Corporation
     Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
@@ -35,7 +35,7 @@
 #include <pthread.h>
 #endif
 
-static size_t message_size;
+static ssize_t message_size;
 static int roundtrip_count;
 
 #if defined ZMQ_HAVE_WINDOWS

perf/inproc_thr.cpp

 /*
+    Copyright (c) 2007-2012 iMatix Corporation
     Copyright (c) 2009-2011 250bpm s.r.o.
-    Copyright (c) 2007-2009 iMatix Corporation
     Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
@@ -36,7 +36,7 @@
 #endif
 
 static int message_count;
-static size_t message_size;
+static ssize_t message_size;
 
 #if defined ZMQ_HAVE_WINDOWS
 static unsigned int __stdcall worker (void *ctx_)

perf/local_lat.cpp

 /*
+    Copyright (c) 2007-2012 iMatix Corporation
     Copyright (c) 2009-2011 250bpm s.r.o.
-    Copyright (c) 2007-2009 iMatix Corporation
     Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
@@ -28,7 +28,7 @@ int main (int argc, char *argv [])
 {
     const char *bind_to;
     int roundtrip_count;
-    size_t message_size;
+    ssize_t message_size;
     void *ctx;
     void *s;
     int rc;

perf/local_thr.cpp

 /*
+    Copyright (c) 2007-2012 iMatix Corporation
     Copyright (c) 2009-2011 250bpm s.r.o.
-    Copyright (c) 2007-2009 iMatix Corporation
     Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
@@ -28,7 +28,7 @@ int main (int argc, char *argv [])
 {
     const char *bind_to;
     int message_count;
-    size_t message_size;
+    ssize_t message_size;
     void *ctx;
     void *s;
     int rc;

perf/remote_lat.cpp

 /*
+    Copyright (c) 2007-2012 iMatix Corporation
     Copyright (c) 2009-2011 250bpm s.r.o.
-    Copyright (c) 2007-2009 iMatix Corporation
     Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
@@ -29,7 +29,7 @@ int main (int argc, char *argv [])
 {
     const char *connect_to;
     int roundtrip_count;
-    size_t message_size;
+    ssize_t message_size;
     void *ctx;
     void *s;
     int rc;