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/usr/include/diet/sys/select.h is in dietlibc-dev 0.33~cvs20120325-4.

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#ifndef _SYS_SELECT_H
#define _SYS_SELECT_H

#include <string.h>
#include <signal.h>

__BEGIN_DECLS

typedef long int fd_mask;

#define NFDBITS	(8 * sizeof(unsigned long))
#define FD_SETSIZE	1024
#define __FDSET_LONGS	(FD_SETSIZE/NFDBITS)
#define __FDELT(d)	((d) / NFDBITS)
#define __FDMASK(d)	(1UL << ((d) % NFDBITS))

typedef struct {
  unsigned long fds_bits [__FDSET_LONGS];
} fd_set;

#define FD_SET(d, set)	((set)->fds_bits[__FDELT(d)] |= __FDMASK(d))
#define FD_CLR(d, set)	((set)->fds_bits[__FDELT(d)] &= ~__FDMASK(d))
#define FD_ISSET(d, set)	(((set)->fds_bits[__FDELT(d)] & __FDMASK(d)) != 0)
#define FD_ZERO(set)	\
  ((void) memset ((void*) (set), 0, sizeof (fd_set)))

int select(int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout) __THROW;

int pselect(int n, fd_set* readfds, fd_set* writefds, fd_set* exceptfds,
            const struct timespec *timeout, const sigset_t *sigmask) __THROW;

__END_DECLS

#endif