os_calls: Add g_executable_exist()

common/os_calls.c

@@ -2556,6 +2556,14 @@ g_directory_exist(const char *dirname)
 #endif
 }
 
+/*****************************************************************************/
+/* returns boolean, non zero if the file exists  and is a readable executable */
+int
+g_executable_exist(const char *exename)
+{
+    return access(exename, R_OK | X_OK) == 0;
+}
+
 /*****************************************************************************/
 /* returns boolean */
 int

common/os_calls.h

@@ -242,6 +242,7 @@ int      g_set_current_dir(const char *dirname);
 int      g_file_exist(const char *filename);
 int      g_file_readable(const char *filename);
 int      g_directory_exist(const char *dirname);
+int      g_executable_exist(const char *dirname);
 int      g_create_dir(const char *dirname);
 int      g_create_path(const char *path);
 int      g_remove_dir(const char *dirname);