51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
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/* select.h */
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#ifndef _SYS_SELECT_H
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#define _SYS_SELECT_H
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#include <sys/time.h> /* for struct timeval */
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/*
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* You can define your own FDSETSIZE if you want more bits
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*/
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#ifndef FD_SETSIZE
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#define FD_SETSIZE 1024
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#endif /* FD_SETSIZE */
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/* compatability with BSD */
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#define NBBY 8 /* number of bits in a byte */
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typedef unsigned long fd_mask;
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#ifndef howmany
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#define howmany(x, y) (((x) + ((y) - 1)) / (y))
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#endif
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/*
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* Compatibily only: use FD_SETSIZE instead
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*/
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#ifndef FDSETSIZE
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#define FDSETSIZE FD_SETSIZE
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#endif /* FDSETSIZE */
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#define NFDBITS 32
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typedef struct fd_set {
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unsigned mask[FDSETSIZE / NFDBITS];
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} fd_set;
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#define _FDMSKNO(fd) ((fd) / NFDBITS)
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#define _FDBITNO(fd) ((fd) % NFDBITS)
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#define FD_ZERO(setp) memset((setp)->mask, 0, sizeof((setp)->mask))
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#define FD_SET(fd, setp) ((setp)->mask[_FDMSKNO(fd)] |= (1 << (_FDBITNO(fd))))
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#define FD_CLR(fd, setp) ((setp)->mask[_FDMSKNO(fd)] &= ~(1 << (_FDBITNO(fd))))
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#define FD_ISSET(fd, setp) ((setp)->mask[_FDMSKNO(fd)] & (1 << (_FDBITNO(fd))))
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int select(int nbits, struct fd_set *rbits,
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struct fd_set *wbits,
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struct fd_set *ebits,
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struct timeval *timeout);
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#endif /* _SYS_SELECT_H */
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