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| author | Rich Felker <dalias@aerifal.cx> | 2013-07-06 01:12:28 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2013-07-06 01:12:28 -0400 |
| commit | ca9aff6a1646c7fc106bfbb9399b3a1bcb14f18b (patch) | |
| tree | 0e000328e727baf07f60f8b9267e0876fa04d12c /include | |
| parent | 6d861ac87491a207e4599c44b61d142f0a601c2d (diff) | |
| download | musl-ca9aff6a1646c7fc106bfbb9399b3a1bcb14f18b.tar.gz musl-ca9aff6a1646c7fc106bfbb9399b3a1bcb14f18b.tar.bz2 musl-ca9aff6a1646c7fc106bfbb9399b3a1bcb14f18b.tar.xz musl-ca9aff6a1646c7fc106bfbb9399b3a1bcb14f18b.zip | |
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.
Diffstat (limited to 'include')
| -rw-r--r-- | include/sys/select.h | 3 |
1 files changed, 3 insertions, 0 deletions
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 } |