util: add a bit of syntactic sugar for saving/restoring errno

[elogind.git] / src / shared / util.h

diff --git a/src/shared/util.h b/src/shared/util.h
index d1cdd901a04fc2a31603351f788eb09dec7585a0..7f050758a0088b9ebdb87d11c91557b1b5b5abde 100644 (file)
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -615,3 +615,9 @@ char *strextend(char **x, ...);
 char *strrep(const char *s, unsigned n);
 
 void* greedy_realloc(void **p, size_t *allocated, size_t need);
+
+static inline void reset_errno(int *saved_errno) {
+        errno = *saved_errno;
+}
+
+#define PROTECT_ERRNO __attribute__((cleanup(reset_errno))) int _saved_errno_ = errno