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+= nn_reallocmsg(3compat)
+//
+// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2018 Capitar IT Group BV <info@capitar.com>
+//
+// This document is supplied under the terms of the MIT License, a
+// copy of which should be located in the distribution where this
+// file was obtained (LICENSE.txt).  A copy of the license may also be
+// found online at https://opensource.org/licenses/MIT.
+//
+
+== NAME
+
+nn_reallocmsg - reallocate message (compatible API)
+
+== SYNOPSIS
+
+[source,c]
+----
+#include <nanomsg/nn.h>
+
+void *nn_reallocmsg(void *old, size_t size);
+----
+
+== DESCRIPTION
+
+The `nn_reallocmsg()` reallocates the message _old_, making it of size _size_.
+
+NOTE: This function is provided for API
+xref:nng_compat.3compat.adoc[compatibility] with legacy _libnanomsg_.
+Consider using the relevant xref:libnng.3.adoc[modern API] instead.
+
+On success, the contents of _old_ are copied into the new message
+(truncating if appropriate), then _old_ is deallocated, and a pointer
+to the new message payload is returned.
+
+On failure, the _old_ message is unchanged, and the value `NULL` is returned
+to the caller.
+
+== RETURN VALUES
+
+This function returns a pointer to message buffer space, or `NULL`
+on failure.
+
+== ERRORS
+
+[horizontal]
+`ENOMEM`:: Insufficient memory is available.
+`EINVAL`:: An invalid _size_ was specified.
+`ETERM`:: The library is shutting down.
+
+== SEE ALSO
+
+[.text-left]
+xref:nn_allocmsg.3compat.adoc[nn_allocmsg(3compat)],
+xref:nn_freemsg.3compat.adoc[nn_freemsg(3compat)],
+xref:nn_errno.3compat.adoc[nn_errno(3compat)],
+xref:nng_compat.3compat.adoc[nng_compat(3compat)],
+xref:nng.7.adoc[nng(7)]