Jeremy Soller
24 lines
738 B
C
24 lines
738 B
C
#ifndef _BITS_SYS_SELECT_H
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#define _BITS_SYS_SELECT_H
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#define FD_SETSIZE 1024
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#define NFDBITS (8 * sizeof(unsigned long))
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typedef struct fd_set {
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unsigned long fds_bits[FD_SETSIZE / NFDBITS];
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} fd_set;
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#define _FD_INDEX(fd) ((fd) / NFDBITS)
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#define _FD_BITMASK(fd) (1UL << ((fd) & NFDBITS))
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#define FD_ZERO(set) for (int i = 0; i < sizeof((set)->fds_bits) / sizeof(unsigned long); i += 1) { \
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(set)->fds_bits[i] = 0; \
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}
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#define FD_SET(fd, set) ((set)->fds_bits[_FD_INDEX(fd)] |= _FD_BITMASK(fd))
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#define FD_CLR(fd, set) ((set)->fds_bits[_FD_INDEX(fd)] &= ~(_FD_BITMASK(fd)))
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#define FD_ISSET(fd, set) (((set)->fds_bits[_FD_INDEX(fd)] & _FD_BITMASK(fd)) == _FD_BITMASK(fd))
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#endif
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