thodg/cgminer

diff --git a/API-README b/API-README
index 8e099c4..ee9a704 100644
--- a/API-README
+++ b/API-README
@@ -122,7 +122,9 @@ The list of requests - a (*) means it requires privileged access - and replies a
                               ADL in use=X, <- Y or N if any GPU has ADL
                               Strategy=Name, <- the current pool strategy
                               Log Interval=N, <- log interval (--log N)
-                              Device Code=GPU ICA | <- spaced list of compiled devices
+                              Device Code=GPU ICA , <- spaced list of compiled devices
+                              OS=Linux/Apple/..., <- operating System
+                              Failover-Only=true/false | <- failover-only setting
 
  summary       SUMMARY        The status summary of the miner
                               e.g. Elapsed=NNN,Found Blocks=N,Getworks=N,...|
@@ -275,6 +277,10 @@ The list of requests - a (*) means it requires privileged access - and replies a
  check|cmd     COMMAND        Exists=Y/N, <- 'cmd' exists in this version
                               Access=Y/N| <- you have access to use 'cmd'
 
+ failover-only|true/false (*)
+               none           There is no reply section just the STATUS section
+                              stating what failover-only was set to
+
 When you enable, disable or restart a GPU or PGA, you will also get Thread messages
 in the cgminer status window
 
@@ -327,6 +333,16 @@ miner.php - an example web page to access the API
 Feature Changelog for external applications using the API:
 
 
+API V1.16
+
+Added API commands:
+ 'failover-only'
+
+Modified API commands:
+ 'config' - include failover-only state
+
+----------
+
 API V1.15 (cgminer v2.6.1)
 
 Added API commands:
diff --git a/api.c b/api.c
index 557aa5e..8dd7d90 100644
--- a/api.c
+++ b/api.c
@@ -166,7 +166,7 @@ static const char SEPARATOR = '|';
 #define SEPSTR "|"
 static const char GPUSEP = ',';
 
-static const char *APIVERSION = "1.15";
+static const char *APIVERSION = "1.16";
 static const char *DEAD = "Dead";
 static const char *SICK = "Sick";
 static const char *NOSTART = "NoStart";
@@ -184,6 +184,9 @@ static const char *YES = "Y";
 static const char *NO = "N";
 static const char *NULLSTR = "(null)";
 
+static const char *TRUESTR = "true";
+static const char *FALSESTR = "false";
+
 static const char *DEVICECODE = ""
 #ifdef HAVE_OPENCL
 			"GPU "
@@ -376,6 +379,9 @@ static const char *JSON_PARAMETER = "parameter";
 #define MSG_CHECK 72
 #define MSG_POOLPRIO 73
 #define MSG_DUPPID 74
+#define MSG_MISBOOL 75
+#define MSG_INVBOOL 76
+#define MSG_FOO 77
 
 enum code_severity {
 	SEVERITY_ERR,
@@ -403,6 +409,7 @@ enum code_parameters {
 	PARAM_POOL,
 	PARAM_STR,
 	PARAM_BOTH,
+	PARAM_BOOL,
 	PARAM_NONE
 };
 
@@ -524,6 +531,9 @@ struct CODES {
  { SEVERITY_SUCC,  MSG_MINESTATS,PARAM_NONE,	"CGMiner stats" },
  { SEVERITY_ERR,   MSG_MISCHK,	PARAM_NONE,	"Missing check cmd" },
  { SEVERITY_SUCC,  MSG_CHECK,	PARAM_NONE,	"Check command" },
+ { SEVERITY_ERR,   MSG_MISBOOL,	PARAM_NONE,	"Missing parameter: true/false" },
+ { SEVERITY_ERR,   MSG_INVBOOL,	PARAM_NONE,	"Invalid parameter should be true or false" },
+ { SEVERITY_SUCC,  MSG_FOO,	PARAM_BOOL,	"Failover-Only set to %s" },
  { SEVERITY_FAIL, 0, 0, NULL }
 };
 
@@ -928,7 +938,7 @@ static struct api_data *print_data(struct api_data *root, char *buf, bool isjson
 				sprintf(buf, "%.15f", *((double *)(root->data)));
 				break;
 			case API_BOOL:
-				sprintf(buf, "%s", *((bool *)(root->data)) ? "true" : "false");
+				sprintf(buf, "%s", *((bool *)(root->data)) ? TRUESTR : FALSESTR);
 				break;
 			case API_TIMEVAL:
 				sprintf(buf, "%ld.%06ld",
@@ -1133,6 +1143,9 @@ static char *message(int messageid, int paramid, char *param2, bool isjson)
 				case PARAM_BOTH:
 					sprintf(buf, codes[i].description, paramid, param2);
 					break;
+				case PARAM_BOOL:
+					sprintf(buf, codes[i].description, paramid ? TRUESTR : FALSESTR);
+					break;
 				case PARAM_NONE:
 				default:
 					strcpy(buf, codes[i].description);
@@ -1233,6 +1246,7 @@ static void minerconfig(__maybe_unused SOCKETTYPE c, __maybe_unused char *param,
 	root = api_add_int(root, "Log Interval", &opt_log_interval, false);
 	root = api_add_const(root, "Device Code", DEVICECODE, false);
 	root = api_add_const(root, "OS", OSINFO, false);
+	root = api_add_bool(root, "Failover-Only", &opt_fail_only, false);
 
 	root = print_data(root, buf, isjson);
 	if (isjson)
@@ -1240,8 +1254,7 @@ static void minerconfig(__maybe_unused SOCKETTYPE c, __maybe_unused char *param,
 	strcat(io_buffer, buf);
 }
 
-static const char*
-status2str(enum alive status)
+static const char *status2str(enum alive status)
 {
 	switch (status) {
 		case LIFE_WELL:
@@ -2704,6 +2717,27 @@ static void minerstats(__maybe_unused SOCKETTYPE c, __maybe_unused char *param, 
 		strcat(io_buffer, JSON_CLOSE);
 }
 
+static void failoveronly(__maybe_unused SOCKETTYPE c, char *param, bool isjson, __maybe_unused char group)
+{
+	if (param == NULL || *param == '\0') {
+		strcpy(io_buffer, message(MSG_MISBOOL, 0, NULL, isjson));
+		return;
+	}
+
+	*param = tolower(*param);
+
+	if (*param != 't' && *param != 'f') {
+		strcpy(io_buffer, message(MSG_INVBOOL, 0, NULL, isjson));
+		return;
+	}
+
+	bool tf = (*param == 't');
+
+	opt_fail_only = tf;;
+
+	strcpy(io_buffer, message(MSG_FOO, tf, NULL, isjson));
+}
+
 static void checkcommand(__maybe_unused SOCKETTYPE c, char *param, bool isjson, char group);
 
 struct CMDS {
@@ -2754,6 +2788,7 @@ struct CMDS {
 	{ "restart",		dorestart,	true },
 	{ "stats",		minerstats,	false },
 	{ "check",		checkcommand,	false },
+	{ "failover-only",	failoveronly,	true },
 	{ NULL,			NULL,		false }
 };
 
diff --git a/cgminer.c b/cgminer.c
index 171c94c..15b7198 100644
--- a/cgminer.c
+++ b/cgminer.c
@@ -130,7 +130,7 @@ bool use_curses;
 #endif
 static bool opt_submit_stale = true;
 static int opt_shares;
-static bool opt_fail_only;
+bool opt_fail_only;
 bool opt_autofan;
 bool opt_autoengine;
 bool opt_noadl;
diff --git a/miner.h b/miner.h
index 5afa071..af66e85 100644
--- a/miner.h
+++ b/miner.h
@@ -551,6 +551,7 @@ extern bool opt_protocol;
 extern char *opt_kernel_path;
 extern char *opt_socks_proxy;
 extern char *cgminer_path;
+extern bool opt_fail_only;
 extern bool opt_autofan;
 extern bool opt_autoengine;
 extern bool use_curses;