From: Bartosz Golaszewski <bartekgola@gmail.com>
Date: Wed, 27 Sep 2017 09:10:38 +0000 (+0200)
Subject: core: new public macro
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2eff5f51e67b98f7abdb03fe469ee4feea338e22;p=qemu-gpiodev%2Flibgpiod.git

core: new public macro

Export GPIOD_UNUSED in gpiod.h as it may be useful for users not
using all arguments in certain callback functions.

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
---

diff --git a/include/gpiod.h b/include/gpiod.h
index 5d52eef..749752a 100644
--- a/include/gpiod.h
+++ b/include/gpiod.h
@@ -51,6 +51,11 @@ struct gpiod_chip_iter;
  */
 #define GPIOD_BIT(nr)		(1UL << (nr))
 
+/**
+ * @brief Marks a function argument or variable as potentially unused.
+ */
+#define GPIOD_UNUSED		__attribute__((unused))
+
 /**
  * @}
  *
diff --git a/src/lib/simple.c b/src/lib/simple.c
index f7041d5..1865646 100644
--- a/src/lib/simple.c
+++ b/src/lib/simple.c
@@ -16,8 +16,6 @@
 #include <errno.h>
 #include <poll.h>
 
-#define UNUSED __attribute__((unused))
-
 int gpiod_simple_get_value(const char *consumer, const char *device,
 			   unsigned int offset, bool active_low)
 {
@@ -140,7 +138,7 @@ int gpiod_simple_set_value_multiple(const char *consumer, const char *device,
 static int basic_event_poll(unsigned int num_lines, const int *fds,
 			    unsigned int *event_offset,
 			    const struct timespec *timeout,
-			    void *data UNUSED)
+			    void *data GPIOD_UNUSED)
 {
 	struct pollfd poll_fds[GPIOD_REQUEST_MAX_LINES];
 	unsigned int i;