server: gdb: export gdb_actual_connections through a function

The internal variable 'gdb_actual_connections' is used by log and
by semihosting to determine if there are active GDB connections.

Keep the variable local in server's code and only export its value
through a dedicated function.

This solves the issue detected by 'parse' of the variable defined
as global but not declared in any include file.

Change-Id: I6e14f4cb1097787404094636f8a2a291340222dd
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7673
Tested-by: jenkins

src/helper/log.c

@@ -19,6 +19,7 @@
 #include "command.h"
 #include "replacements.h"
 #include "time_support.h"
+#include <server/gdb_server.h>
 #include <server/server.h>
 
 #include <stdarg.h>
@@ -399,9 +400,7 @@ char *alloc_printf(const char *format, ...)
 
 static void gdb_timeout_warning(int64_t delta_time)
 {
-	extern int gdb_actual_connections;
-
-	if (gdb_actual_connections)
+	if (gdb_get_actual_connections())
 		LOG_WARNING("keep_alive() was not invoked in the "
 			"%d ms timelimit. GDB alive packet not "
 			"sent! (%" PRId64 " ms). Workaround: increase "

src/server/gdb_server.c

@@ -117,7 +117,7 @@ static void gdb_sig_halted(struct connection *connection);
 
 /* number of gdb connections, mainly to suppress gdb related debugging spam
  * in helper/log.c when no gdb connections are actually active */
-int gdb_actual_connections;
+static int gdb_actual_connections;
 
 /* set if we are sending a memory map to gdb
  * via qXfer:memory-map:read packet */
@@ -4105,3 +4105,8 @@ void gdb_service_free(void)
 	free(gdb_port);
 	free(gdb_port_next);
 }
+
+int gdb_get_actual_connections(void)
+{
+	return gdb_actual_connections;
+}

src/server/gdb_server.h

@@ -20,6 +20,7 @@
 struct image;
 struct reg;
 #include <target/target.h>
+#include <server/server.h>
 
 #define GDB_BUFFER_SIZE 16384
 
@@ -29,6 +30,8 @@ void gdb_service_free(void);
 
 int gdb_put_packet(struct connection *connection, char *buffer, int len);
 
+int gdb_get_actual_connections(void);
+
 static inline struct target *get_target_from_connection(struct connection *connection)
 {
 	struct gdb_service *gdb_service = connection->service->priv;

src/target/semihosting_common.c

@@ -39,6 +39,7 @@
 
 #include <helper/binarybuffer.h>
 #include <helper/log.h>
+#include <server/gdb_server.h>
 #include <sys/stat.h>
 
 /**
@@ -92,9 +93,6 @@ static int semihosting_common_fileio_info(struct target *target,
 static int semihosting_common_fileio_end(struct target *target, int result,
 	int fileio_errno, bool ctrl_c);
 
-/* Attempts to include gdb_server.h failed. */
-extern int gdb_actual_connections;
-
 /**
  * Initialize common semihosting support.
  *
@@ -493,7 +491,7 @@ int semihosting_common(struct target *target)
 					int code = semihosting_get_field(target, 1, fields);
 
 					if (type == ADP_STOPPED_APPLICATION_EXIT) {
-						if (!gdb_actual_connections)
+						if (!gdb_get_actual_connections())
 							exit(code);
 						else {
 							fprintf(stderr,
@@ -508,7 +506,7 @@ int semihosting_common(struct target *target)
 				}
 			} else {
 				if (semihosting->param == ADP_STOPPED_APPLICATION_EXIT) {
-					if (!gdb_actual_connections)
+					if (!gdb_get_actual_connections())
 						exit(0);
 					else {
 						fprintf(stderr,
@@ -517,14 +515,14 @@ int semihosting_common(struct target *target)
 				} else if (semihosting->param == ADP_STOPPED_RUN_TIME_ERROR) {
 					/* Chosen more or less arbitrarily to have a nicer message,
 					 * otherwise all other return the same exit code 1. */
-					if (!gdb_actual_connections)
+					if (!gdb_get_actual_connections())
 						exit(1);
 					else {
 						fprintf(stderr,
 							"semihosting: *** application exited with error ***\n");
 					}
 				} else {
-					if (!gdb_actual_connections)
+					if (!gdb_get_actual_connections())
 						exit(1);
 					else {
 						fprintf(stderr,
@@ -584,7 +582,7 @@ int semihosting_common(struct target *target)
 				int code = semihosting_get_field(target, 1, fields);
 
 				if (type == ADP_STOPPED_APPLICATION_EXIT) {
-					if (!gdb_actual_connections)
+					if (!gdb_get_actual_connections())
 						exit(code);
 					else {
 						fprintf(stderr,