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/* ISC license. */
#include <skalibs/bsdsnowflake.h>
#include <string.h> /* Solaris... */
#include <errno.h>
#include <sys/time.h> /* MacOS... */
#include <sys/select.h>
#include <skalibs/tai.h>
#include <skalibs/iopause.h>
int iopause_select (iopause_fd *x, unsigned int len, tain const *deadline, tain const *stamp)
{
struct timeval tv = { .tv_sec = 0, .tv_usec = 0 } ;
int nfds = 0 ;
fd_set rfds, wfds, xfds ;
int r ;
FD_ZERO(&rfds) ;
FD_ZERO(&wfds) ;
FD_ZERO(&xfds) ;
if (deadline && tain_less(stamp, deadline))
{
tain delta ;
tain_sub(&delta, deadline, stamp) ;
if (!timeval_from_tain_relative(&tv, &delta))
{
if (errno != EOVERFLOW) return -1 ;
else deadline = 0 ;
}
}
for (unsigned int i = 0 ; i < len ; i++)
{
x[i].revents = 0 ;
if (x[i].fd >= 0)
{
if (x[i].fd >= FD_SETSIZE) return (errno = EMFILE, -1) ;
if (x[i].fd >= nfds) nfds = x[i].fd + 1 ;
if (x[i].events & IOPAUSE_READ) FD_SET(x[i].fd, &rfds) ;
if (x[i].events & IOPAUSE_WRITE) FD_SET(x[i].fd, &wfds) ;
if (x[i].events & IOPAUSE_EXCEPT) FD_SET(x[i].fd, &xfds) ;
}
}
r = select(nfds, &rfds, &wfds, &xfds, deadline ? &tv : 0) ;
if (r > 0)
for (unsigned int i = 0 ; i < len ; i++) if (x[i].fd >= 0)
{
if (FD_ISSET(x[i].fd, &rfds)) x[i].revents |= IOPAUSE_READ ;
if (FD_ISSET(x[i].fd, &wfds)) x[i].revents |= IOPAUSE_WRITE ;
if (FD_ISSET(x[i].fd, &xfds)) x[i].revents |= IOPAUSE_EXCEPT | x[i].events ;
}
return r ;
}
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