quad: improve fifo naming in virtual quad

quad/src/virt_quad/hw_impl_unix.h

@@ -10,6 +10,8 @@
 #include <stdlib.h>
 #include <time.h>
 
+#define VIRT_QUAD_FIFOS_DIR "virt-quad-fifos"
+
 int unix_uart_reset(struct UARTDriver *self);
 int unix_uart_write(struct UARTDriver *self, unsigned char c);
 int unix_uart_read(struct UARTDriver *self, unsigned char *c);

quad/src/virt_quad/hw_impl_unix_pwm_input.c

@@ -4,7 +4,6 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 
-static char *fifo_dir = "virt-quad-fifos";
 static char *pwms[6];
 static int fifos[6];
 static unsigned long cache[6];
@@ -17,12 +16,12 @@ int unix_pwm_input_reset(struct PWMInputDriver *self) {
   pwms[4] = "pwm-input-gear";
   pwms[5] = "pwm-input-flap";
 
-  mkdir(fifo_dir, 0777);
+  mkdir(VIRT_QUAD_FIFOS_DIR, 0777);
   int i;
   for (i = 0; i < 6; i += 1) {
     unlink(pwms[i]);
     char fifoname[64];
-    sprintf(fifoname, "%s/%s", fifo_dir, pwms[i]);
+    sprintf(fifoname, "%s/%s", VIRT_QUAD_FIFOS_DIR, pwms[i]);
     mkfifo(fifoname, 0666);
     fifos[i] = open(fifoname, O_RDONLY | O_NONBLOCK);
   }

quad/src/virt_quad/hw_impl_unix_pwm_output.c

@@ -4,16 +4,15 @@
 #include <fcntl.h>
 #include <string.h>
 
-static char *fifo_dir = "virt-quad-fifos";
 static char *output_pwms[4];
 
 int unix_pwm_output_reset(struct PWMOutputDriver *self) {
-  output_pwms[0] = "virt-quad-fifos/pwm-output-motor1";
-  output_pwms[1] = "virt-quad-fifos/pwm-output-motor2";
-  output_pwms[2] = "virt-quad-fifos/pwm-output-motor3";
-  output_pwms[3] = "virt-quad-fifos/pwm-output-motor4";
+  output_pwms[0] = VIRT_QUAD_FIFOS_DIR "/pwm-output-motor1";
+  output_pwms[1] = VIRT_QUAD_FIFOS_DIR "/pwm-output-motor2";
+  output_pwms[2] = VIRT_QUAD_FIFOS_DIR "/pwm-output-motor3";
+  output_pwms[3] = VIRT_QUAD_FIFOS_DIR "/pwm-output-motor4";
 
-  mkdir("virt-quad-fifos", 0777);
+  mkdir(VIRT_QUAD_FIFOS_DIR, 0777);
   int i;
   for (i = 0; i < 4; i += 1) {
     unlink(output_pwms[i]);