From: Rich Felker <dalias@aerifal.cx>
Date: Sat, 6 Jul 2013 05:12:28 +0000 (-0400)
Subject: add NFDBITS in sys/select.h with appropriate feature tests
X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=commitdiff_plain;h=ca9aff6a1646c7fc106bfbb9399b3a1bcb14f18b;ds=sidebyside

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 c5a2877f..e25257d2 100644
--- 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
 }