poll.c

Apache V2.0.15 Alpha For Linuxhttpd-2_0_15-alpha.tar.Z

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#include "networkio.h"
#include "apr_network_io.h"
#include "apr_general.h"
#include "apr_portable.h"
#include "apr_lib.h"
#include <sys/time.h>
#include <stdlib.h>

/*  OS/2 doesn't have a poll function, implement using OS/2 style select */
 
apr_status_t apr_poll_setup(apr_pollfd_t **new, apr_int32_t num, apr_pool_t *cont)
{
    *new = (apr_pollfd_t *)apr_palloc(cont, sizeof(apr_pollfd_t));

    if (*new == NULL) {
        return APR_ENOMEM;
    }

    (*new)->socket_list = apr_palloc(cont, sizeof(int) * num);
    
    if ((*new)->socket_list == NULL) {
        return APR_ENOMEM;
    }
    
    (*new)->r_socket_list = apr_palloc(cont, sizeof(int) * num);
    
    if ((*new)->r_socket_list == NULL) {
        return APR_ENOMEM;
    }
    
    (*new)->cntxt = cont;
    (*new)->num_total = 0;
    (*new)->num_read = 0;
    (*new)->num_write = 0;
    (*new)->num_except = 0;
    
    return APR_SUCCESS;
}



apr_status_t apr_poll_socket_add(apr_pollfd_t *aprset, 
			       apr_socket_t *sock, apr_int16_t events)
{
    int i;
    
    if (events & APR_POLLIN) {
        for (i=aprset->num_total; i>aprset->num_read; i--)
            aprset->socket_list[i] = aprset->socket_list[i-1];
        aprset->socket_list[i] = sock->socketdes;
        aprset->num_read++;
        aprset->num_total++;
    }
            
    if (events & APR_POLLOUT) {
        for (i=aprset->num_total; i>aprset->num_read + aprset->num_write; i--)
            aprset->socket_list[i] = aprset->socket_list[i-1];
        aprset->socket_list[i] = sock->socketdes;
        aprset->num_write++;
        aprset->num_total++;
    }            
        
    if (events &APR_POLLPRI) {
        aprset->socket_list[aprset->num_total] = sock->socketdes;
        aprset->num_except++;
        aprset->num_total++;
    }
    return APR_SUCCESS;
}



apr_status_t apr_poll(apr_pollfd_t *pollfdset, apr_int32_t *nsds, 
                    apr_interval_time_t timeout)
{
    int i;
    int rv = 0;
    apr_time_t starttime = apr_time_now();

    do {
        for (i=0; i<pollfdset->num_total; i++) {
            pollfdset->r_socket_list[i] = pollfdset->socket_list[i];
        }
        
        rv = select(pollfdset->r_socket_list, 
                    pollfdset->num_read, 
                    pollfdset->num_write, 
                    pollfdset->num_except, 
                    timeout >= 0 ? timeout / 1000 : -1);

        if (rv < 0 && sock_errno() == SOCEINTR && timeout >= 0 ) {
            apr_interval_time_t elapsed = apr_time_now() - starttime;

            if (timeout <= elapsed)
                break;

            timeout -= elapsed;
        }
    } while ( rv < 0 && sock_errno() == SOCEINTR );

    (*nsds) = rv;
    return rv < 0 ? APR_OS2_STATUS(sock_errno()) : APR_SUCCESS;
}



apr_status_t apr_poll_revents_get(apr_int16_t *event, apr_socket_t *sock, apr_pollfd_t *aprset)
{
    int i;
    
    *event = 0;
    
    for (i=0; i < aprset->num_total; i++) {
        if (aprset->socket_list[i] == sock->socketdes && aprset->r_socket_list[i] > 0) {
            if (i < aprset->num_read)
                *event |= APR_POLLIN;
            else if (i < aprset->num_read + aprset->num_write)
                *event |= APR_POLLOUT;
            else
                *event |= APR_POLLPRI;
        }
    }

    return APR_SUCCESS;
}



apr_status_t apr_poll_socket_mask(apr_pollfd_t *aprset, 
                                apr_socket_t *sock, apr_int16_t events)
{
    int start, *count, pos;

    while (events) {
        if (events & APR_POLLIN) {
            start = 0;
            count = &aprset->num_read;
            events -= APR_POLLIN;
        } else if (events & APR_POLLOUT) {
            start = aprset->num_read;
            count = &aprset->num_write;
            events -= APR_POLLOUT;
        } else if (events & APR_POLLPRI) {
            start = aprset->num_read + aprset->num_write;
            count = &aprset->num_except;
            events -= APR_POLLPRI;
        } else
            break;

        for (pos=start; pos < start+(*count) && aprset->socket_list[pos] != sock->socketdes; pos++);

        if (pos < start+(*count)) {
            aprset->num_total--;
            (*count)--;

            for (;pos<aprset->num_total; pos++) {
                aprset->socket_list[pos] = aprset->socket_list[pos+1];
            }
        }
    }

    return APR_SUCCESS;
}



apr_status_t apr_poll_socket_remove(apr_pollfd_t *aprset, apr_socket_t *sock)
{
    return apr_poll_socket_mask(aprset, sock, APR_POLLIN|APR_POLLOUT|APR_POLLPRI);
}



apr_status_t apr_poll_socket_clear(apr_pollfd_t *aprset, apr_int16_t events)
{
    aprset->num_read = 0;
    aprset->num_write = 0;
    aprset->num_except = 0;
    aprset->num_total = 0;
    return APR_SUCCESS;
}



apr_status_t apr_poll_data_get(apr_pollfd_t *pollfd, const char *key, void *data)
{
    return apr_pool_userdata_get(data, key, pollfd->cntxt);
}



apr_status_t apr_poll_data_set(apr_pollfd_t *pollfd, void *data, const char *key,
                            apr_status_t (*cleanup) (void *))
{
    return apr_pool_userdata_set(data, key, cleanup, pollfd->cntxt);
}