Added overwrite output mode for things like live monitoring.

evga-icx.c

@@ -25,7 +25,8 @@ static const char helpstring[] = "Available options:\n"
 								 "--reset      : Reset all fans to their default mode\n"
 								 "--sensors    : Print sensor readings even if setting a fan speed \n"
 								 "--compact    : Print sensor reading in a compact one-line per card format\n"
-								 "--watch N    : Keep printing output every N seconds\n";
+								 "--watch N    : Keep printing output every N seconds\n"
+								 "--overwrite  : Overwrite previously displayed info with --watch and --compact instead of continuously logging\n";
 								 
 void print_gpu_info(int gpu_num, struct card_info gpus[], int compact);
 
@@ -36,6 +37,7 @@ int main (int argc, char **argv)
 	int print_info = 0;
 	int compact = 0;
 	int gpu_num = -1;    /* Card to control */
+	int overwrite = 0;
 	unsigned int watch = 0;
 	char *fan_speed[ICX3_MAX_FANS] = {NULL}; 
 	
@@ -83,6 +85,8 @@ int main (int argc, char **argv)
 				printf(helpstring);
 				return -1;
 			}
+		} else if (strcmp(argv[i], "--overwrite") == 0) {
+			overwrite = 1;
 		} else {
 			printf(helpstring);
 			return 0;
@@ -98,6 +102,10 @@ int main (int argc, char **argv)
 		}
 	}
 	
+	/* Don't use overwrite mode unless set to compact (we can't tell how many lines the output will be per GPU) */
+	if (overwrite && !compact)
+		overwrite = 0;
+	
 	gpu_count = find_evga_gpu_i2cs(gpus, MAX_GPUS);
 
 	if (gpu_count == -1) {
@@ -131,20 +139,35 @@ int main (int argc, char **argv)
 	
 	/* NVML init */
 #ifdef USE_NVML
-	int nvml_ok = init_nvml();
-	nvmlDevice_t* device[MAX_GPUS];
+    init_nvml();
 #endif
 	
 	/* print sensor info */
 	if (print_info) {
 		do {
+			printf("\x1b[K");	/* Clear current console line (really just for overwrite mode) */
+			
 			if (gpu_num == -1) {
+				/* No GPU specified on command line, loop over all supported GPUs */
 				for (int i = 0; i < gpu_count; i++){
+					if (i > 0)
+						printf("\n");
 					print_gpu_info(i, &gpus[i], compact);
 				}		
 			} else if (gpu_num <= gpu_count - 1) {
 				print_gpu_info(gpu_num, &gpus[gpu_num], compact);
 			}
+
+			if (!overwrite)
+				printf("\n"); /* Print line break at the end for continuous output */
+			
+			if (overwrite && compact) {
+				printf("\x1b[1G");						/* Move cursor back to column 1 */
+				if (gpu_count > 1)
+					printf("\x1b[%dA", gpu_count-1);	/* Move cursor back up to the top of gpu list */
+			}
+			
+			fflush(stdout);
 			sleep(watch);
 		} while (watch > 0);
 	}
@@ -168,7 +191,6 @@ void print_gpu_info(int gpu_num, struct card_info *gpu, int compact) {
 #ifdef USE_NVML
 		print_nvml_clock_reason(1, gpu);
 #endif
-		printf("\n");
 	} else {
 		/* One line per GPU sensor */
 		printf("#%d: %s (%s) @ %s\n", gpu_num, gpu->card_name, gpu->i2c_dev_path, gpu->pci_id);
@@ -180,7 +202,6 @@ void print_gpu_info(int gpu_num, struct card_info *gpu, int compact) {
 #ifdef USE_NVML
 		print_nvml_clock_reason(0, gpu);
 #endif
-		printf("\n");
 	}
 	
 }