musl/include/sys/select.h

#ifndef _SYS_SELECT_H
#define _SYS_SELECT_H
#ifdef __cplusplus
extern "C" {
#endif

#define __NEED_size_t
#define __NEED_time_t
#define __NEED_struct_timeval
#define __NEED_struct_timespec
#define __NEED_sigset_t

#include <bits/alltypes.h>

#define FD_SETSIZE 1024

typedef struct
{
	unsigned long fds_bits[FD_SETSIZE / 8 / sizeof(long)];
} fd_set;

#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)
#define FD_SET(d, s)   ((s)->fds_bits[(d)/(8*sizeof(long))] |= (1<<((d)%(8*sizeof(long)))))
#define FD_CLR(d, s)   ((s)->fds_bits[(d)/(8*sizeof(long))] &= ~(1<<((d)%(8*sizeof(long)))))
#define FD_ISSET(d, s) ((s)->fds_bits[(d)/(8*sizeof(long))] & (1<<((d)%(8*sizeof(long)))))

int select (int, fd_set *, fd_set *, fd_set *, struct timeval *);
int pselect (int, fd_set *, fd_set *, fd_set *, const struct timespec *, const sigset_t *);


#ifdef __cplusplus
}
#endif
#endif