#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <sys/select.h>

#include <errno.h>

#include "../internal/syscall.h"

/*
 * select: plain POSIX select over SYS_pselect6. The kernel wants a struct
 * timespec, so the struct timeval timeout is converted here (NULL passes
 * through as "block indefinitely") and the sigset pair stays NULL: select
 * never changes the signal mask. select() and pselect() share this syscall
 * on Linux; the 6th argument of pselect6 is a { sigset_t *, size_t } pair
 * pointer that is NULL when the mask is left alone.
 */
int
select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout)
{
    struct timespec ts;
    struct timespec *tsp = NULL;

    if (timeout != NULL)
    {
        if (timeout->tv_sec < 0 || timeout->tv_usec < 0 || timeout->tv_usec >= 1000000L)
        {
            errno = EINVAL;
            return -1;
        }
        ts.tv_sec = timeout->tv_sec;
        ts.tv_nsec = (long)timeout->tv_usec * 1000;
        tsp = &ts;
    }
    return syscall_ret(__syscall6(SYS_pselect6, (long)nfds, (long)readfds, (long)writefds,
                                  (long)exceptfds, (long)tsp, 0L));
}