util: split out errno related stuff

src/basic/util.h

@@ -63,31 +63,6 @@ void in_initrd_force(bool value);
 
 int on_ac_power(void);
 
-static inline void _reset_errno_(int *saved_errno) {
-        if (*saved_errno < 0) /* Invalidated by UNPROTECT_ERRNO? */
-                return;
-
-        errno = *saved_errno;
-}
-
-#define PROTECT_ERRNO                                                   \
-        _cleanup_(_reset_errno_) _unused_ int _saved_errno_ = errno
-
-#define UNPROTECT_ERRNO                         \
-        do {                                    \
-                errno = _saved_errno_;          \
-                _saved_errno_ = -1;             \
-        } while (false)
-
-static inline int negative_errno(void) {
-        /* This helper should be used to shut up gcc if you know 'errno' is
-         * negative. Instead of "return -errno;", use "return negative_errno();"
-         * It will suppress bogus gcc warnings in case it assumes 'errno' might
-         * be 0 and thus the caller's error-handling might not be triggered. */
-        assert_return(errno > 0, -EINVAL);
-        return -errno;
-}
-
 static inline unsigned u64log2(uint64_t n) {
 #if __SIZEOF_LONG_LONG__ == 8
         return (n > 1) ? (unsigned) __builtin_clzll(n) ^ 63U : 0;