Add CLOSE_AND_REPLACE helper

Similar to free_and_replace. I think this should be uppercase to make it
clear that this is a macro. free_and_replace should probably be uppercased
too.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/basic/fd-util.h b/src/basic/fd-util.h
index e490753caf..93ce95cd03 100644
--- a/src/basic/fd-util.h
+++ b/src/basic/fd-util.h
@@ -93,6 +93,16 @@ static inline int make_null_stdio(void) {
                 _fd_;                           \
         })
 
+/* Like free_and_replace(), but for file descriptors */
+#define CLOSE_AND_REPLACE(a, b)                 \
+        ({                                      \
+                int *_fdp_ = &(a);              \
+                safe_close(*_fdp_);             \
+                *_fdp_ = TAKE_FD(b);            \
+                0;                              \
+        })
+
+
 int fd_reopen(int fd, int flags);
 
 int read_nr_open(void);