xclose()

Add a helper to check for close errrors - especially bad file
descriptors, that can be a fun source of heisenbugs.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 6 insertions, 0 deletions

diff --git a/c_src/tools-util.h b/c_src/tools-util.h
index ca84dd01..d3d6b14b 100644
--- a/c_src/tools-util.h
+++ b/c_src/tools-util.h
@@ -82,6 +82,12 @@ static inline void *xrealloc(void *p, size_t size)
 	_ret;								\
 })
 
+#define xclose(_fd)							\
+do {									\
+	if (close(_fd))							\
+		die("error closing fd: %m at %s:%u", __FILE__, __LINE__);\
+} while (0)
+
 void write_file_str(int, const char *, const char *);
 char *read_file_str(int, const char *);
 u64 read_file_u64(int, const char *);