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commit f4a3c158aa76255aeecce1e5ed89228017ec5841
Author: Graham Ollis <plicease@cpan.org>
Date:   Wed Jun 3 13:57:41 2020 -0600

    add interface to override hostname

diff --git a/include/libnewrelic.h b/include/libnewrelic.h
index 8089746..b5e0e72 100644
--- a/include/libnewrelic.h
+++ b/include/libnewrelic.h
@@ -1248,6 +1248,8 @@ bool newrelic_accept_distributed_trace_payload_httpsafe(
 bool newrelic_set_transaction_name(newrelic_txn_t* transaction,
                                    const char* transaction_name);
 
+bool newrelic_set_hostname(const char *hostname);
+
 /**
  * A list of examples for Doxygen to cross-reference. If a function in
  * libnewrelic.h appears in one of these examples, the example source
diff --git a/src/global.c b/src/global.c
index 1b0177a..791296f 100644
--- a/src/global.c
+++ b/src/global.c
@@ -6,6 +6,7 @@
 #include "util_memory.h"
 #include "util_sleep.h"
 #include "util_strings.h"
+#include "util_system.h"
 
 #include <stdlib.h>
 
@@ -129,3 +130,8 @@ void newrelic_add_api_supportability_metric(nrtxn_t* txn, const char* name) {
 
   nr_free(metric);
 }
+
+bool newrelic_set_hostname(const char *hostname) {
+  nrl_info(NRL_API, "override hostname to %s", hostname);
+  return nr_system_set_hostname(hostname);
+}
diff --git a/vendor/newrelic/axiom/util_system.c b/vendor/newrelic/axiom/util_system.c
index 372dc6b..f87a432 100644
--- a/vendor/newrelic/axiom/util_system.c
+++ b/vendor/newrelic/axiom/util_system.c
@@ -23,9 +23,21 @@ char* nr_system_get_service_port(const char* service, const char* port_type) {
   return port;
 }
 
+static char *override_hostname;
+
+int nr_system_set_hostname(const char *hostname) {
+  nr_free(override_hostname);
+  override_hostname = nr_strdup(hostname);
+  return 1;
+}
+
 char* nr_system_get_hostname(void) {
   char hn[512];
 
+  if (override_hostname != NULL) {
+    return nr_strdup(override_hostname);
+  }
+
   nr_memset(&hn, 0, sizeof(hn));
 
   gethostname(hn, sizeof(hn));
diff --git a/vendor/newrelic/axiom/util_system.h b/vendor/newrelic/axiom/util_system.h
index 6bcf75b..2ae9579 100644
--- a/vendor/newrelic/axiom/util_system.h
+++ b/vendor/newrelic/axiom/util_system.h
@@ -44,6 +44,13 @@ extern char* nr_system_get_service_port(const char* service,
  */
 extern char* nr_system_get_hostname(void);
 
+/*
+ * Purpose : Set the host name.
+ *
+ * Returns : 1 on success
+ */
+extern int nr_system_set_hostname(const char*);
+
 /*
  * Purpose : Returns the number of logical processors available.