add NFDBITS in sys/select.h with appropriate feature tests

the main use for this macro seems to be knowing the correct allocation
granularity for dynamic-sized fd_set objects. such usage is
non-conforming and results in undefined behavior, but it is widespread
in applications.

diff --git a/include/sys/select.h b/include/sys/select.h
index c5a2877f87ac604c0082c4dbb0c4dc4442bd4b3d..e25257d2f33b9232fb4c171a932c41427c224e71 100644 (file)
--- a/include/sys/select.h
+++ b/include/sys/select.h
@@ -32,6 +32,9 @@ typedef struct
 int select (int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict, struct timeval *__restrict);
 int pselect (int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict, const struct timespec *__restrict, const sigset_t *__restrict);
 
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+#define NFDBITS (8*(int)sizeof(long))
+#endif
 
 #ifdef __cplusplus
 }