SSelect.c

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#include "syshdrs.h"
 
void
SelectSetInit(SelectSetPtr const ssp, const double timeout)
{
    double i;
    long l;
 
    /* Inititalize SelectSet, which will clear the fd_set, the
     * timeval, and the maxfd and numfds to 0.
     */
    memset(ssp, 0, sizeof(SelectSet));
    l = (long) timeout;
    i = (double) l;
    ssp->timeout.tv_sec = l;
    ssp->timeout.tv_usec = (long) ((timeout - i) * 1000000.0);
}   /* SelectSetInit */
 
 
 
 
void
SelectSetAdd(SelectSetPtr const ssp, const int fd)
{
    if (fd >= 0) {
        FD_SET(fd, &ssp->fds);
        if (ssp->maxfd < (fd + 1))
            ssp->maxfd = (fd + 1);
        ++ssp->numfds;
    }
}   /* SelectSetAdd */
 
 
 
 
void
SelectSetRemove(SelectSetPtr const ssp, const int fd)
{
    if ((fd >= 0) && (FD_ISSET(fd, &ssp->fds))) {
        FD_CLR(fd, &ssp->fds);
        /* Note that maxfd is left alone, even if maxfd was
         * this one.  That is okay.
         */
        --ssp->numfds;
    }
}   /* SelectSetRemove */
 
 
 
int
SelectW(SelectSetPtr ssp, SelectSetPtr resultssp)
{
    int rc;
 
    do {
        memcpy(resultssp, ssp, sizeof(SelectSet));
        rc = select(resultssp->maxfd, NULL, SELECT_TYPE_ARG234 &resultssp->fds, NULL, SELECT_TYPE_ARG5 &resultssp->timeout);
    } while ((rc < 0) && (errno == EINTR));
    return (rc);
}   /* SelectW */
 
 
 
int
SelectR(SelectSetPtr ssp, SelectSetPtr resultssp)
{
    int rc;
 
    do {
        memcpy(resultssp, ssp, sizeof(SelectSet));
        rc = select(resultssp->maxfd, SELECT_TYPE_ARG234 &resultssp->fds, NULL, NULL, SELECT_TYPE_ARG5 &resultssp->timeout);
    } while ((rc < 0) && (errno == EINTR));
    return (rc);
}   /* SelectR */