mirror of
git://git.musl-libc.org/musl
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ca9aff6a16
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.
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
#ifndef _SYS_SELECT_H
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#define _SYS_SELECT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <features.h>
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#define __NEED_size_t
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#define __NEED_time_t
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#define __NEED_suseconds_t
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#define __NEED_struct_timeval
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#define __NEED_struct_timespec
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#define __NEED_sigset_t
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#include <bits/alltypes.h>
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#define FD_SETSIZE 1024
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typedef unsigned long fd_mask;
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typedef struct
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{
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unsigned long fds_bits[FD_SETSIZE / 8 / sizeof(long)];
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} fd_set;
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#define FD_ZERO(s) do { int __i; unsigned long *__b=(s)->fds_bits; for(__i=sizeof (fd_set)/sizeof (long); __i; __i--) *__b++=0; } while(0)
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#define FD_SET(d, s) ((s)->fds_bits[(d)/(8*sizeof(long))] |= (1UL<<((d)%(8*sizeof(long)))))
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#define FD_CLR(d, s) ((s)->fds_bits[(d)/(8*sizeof(long))] &= ~(1UL<<((d)%(8*sizeof(long)))))
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#define FD_ISSET(d, s) !!((s)->fds_bits[(d)/(8*sizeof(long))] & (1UL<<((d)%(8*sizeof(long)))))
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int select (int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict, struct timeval *__restrict);
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int pselect (int, fd_set *__restrict, fd_set *__restrict, fd_set *__restrict, const struct timespec *__restrict, const sigset_t *__restrict);
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#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
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#define NFDBITS (8*(int)sizeof(long))
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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