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

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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.
This commit is contained in:
Rich Felker
2013-07-06 01:12:28 -04:00
parent 6d861ac874
commit ca9aff6a16
1 changed files with 3 additions and 0 deletions
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3
include/sys/select.h
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@ -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
}