diff options
Diffstat (limited to 'src/basic/util.h')
| -rw-r--r-- | src/basic/util.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/basic/util.h b/src/basic/util.h index f009d37d4c..dc33d66067 100644 --- a/src/basic/util.h +++ b/src/basic/util.h @@ -174,12 +174,21 @@ static inline void *mempset(void *s, int c, size_t n) { } 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();" |