[PATCH 12/35] monitor: add helpers for __attribute__((cleanup))

mwilck
2021-01-26T20:35:03Z

From: Martin Wilck <mwilck@suse.com>

__attribute__((cleanup)) is very helpful but ugly. Try to avoid
defining lots of cleanup functions with these macros.

Usage: to declare an auto-cleanup variable of type (some_type *),
write

CLEANUP_FUNC(some_type)

void some_func(void)
{
CLEANUP(some_type, varname) = NULL;
...
}

Signed-off-by: Martin Wilck <mwilck@suse.com>
---
common.h | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/common.h b/common.h
index 1c214a4..9386ec5 100644
--- a/common.h
+++ b/common.h
@@ -12,4 +12,16 @@
#define __stringify_1(x...) #x
#define __stringify(x...) __stringify_1(x)

+#define CLEANUP_FUNC(type) \
+static void __cleanup_ ## type ##_p(type ** __p) \
+{ \
+ if (*__p) { \
+ free(*__p); \
+ *__p = NULL; \
+ } \
+}
+
+#define CLEANUP(__t, __v) \
+ __t *__v __attribute__((cleanup(__cleanup_ ## __t ## _p)))
+
#endif
--
2.29.2