[Minios-devel] [UNIKRAFT PATCH] lib/nolibc: Introduce fd_set operation macros

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

Port FD_CLR, FD_ISSET, FD_SET, and FD_ZERO macros from FreeBSD.

Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
---
 lib/nolibc/include/sys/select.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/lib/nolibc/include/sys/select.h b/lib/nolibc/include/sys/select.h
index f7949ee7..e981b7c0 100644
--- a/lib/nolibc/include/sys/select.h
+++ b/lib/nolibc/include/sys/select.h
@@ -28,6 +28,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
+/* Derived from FreeBSD commit 4736ccf (Nov 20, 2017) */
 
 #ifndef __SYS_SELECT_H__
 #define __SYS_SELECT_H__
@@ -60,6 +61,20 @@ typedef struct fd_set {
        __fd_mask __fds_bits[howmany(FD_SETSIZE, _NFDBITS)];
 } fd_set;
 
+#define        __fdset_mask(n) ((__fd_mask)1 << ((n) % _NFDBITS))
+#define        FD_CLR(n, p)    ((p)->__fds_bits[(n)/_NFDBITS] &= 
~__fdset_mask(n))
+#define        FD_ISSET(n, p)  (((p)->__fds_bits[(n)/_NFDBITS] & 
__fdset_mask(n)) != 0)
+#define        FD_SET(n, p)    ((p)->__fds_bits[(n)/_NFDBITS] |= 
__fdset_mask(n))
+#define        FD_ZERO(p) do {                                 \
+       fd_set *_p;                                     \
+       __ssz _n;                                       \
+                                                       \
+       _p = (p);                                       \
+       _n = howmany(FD_SETSIZE, _NFDBITS);             \
+       while (_n > 0)                                  \
+               _p->__fds_bits[--_n] = 0;               \
+} while (0)
+
 #ifdef __cplusplus
 }
 #endif
-- 
2.17.2 (Apple Git-113)


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