src/os/unix/ngx_socket.c

#include <ngx_config.h>
#include <ngx_core.h>


/*
 * ioctl(FIONBIO) sets a blocking mode with the single syscall
 * while fcntl(F_SETFL, ~O_NONBLOCK) needs to learn before
 * a previous state using fcntl(F_GETFL).
 *
 * ioctl() and fcntl() are syscalls on at least FreeBSD 2.x, Linux 2.2
 * and Solaris 7.
 *
 * ioctl() in Linux 2.4 and 2.6 uses BKL, however fcntl(F_SETFL) uses it too.
 */


#if (HAVE_FIONBIO)

int ngx_nonblocking(ngx_socket_t s)
{
    u_long  nb;

    nb = 1;

    return ioctl(s, FIONBIO, &nb);
}


int ngx_blocking(ngx_socket_t s)
{
    u_long  nb;

    nb = 0;

    return ioctl(s, FIONBIO, &nb);
}

#endif


#ifdef __FreeBSD__

int ngx_tcp_nopush(ngx_socket_t s)
{
    int  tcp_nopush;

    tcp_nopush = 1;

    return setsockopt(s, IPPROTO_TCP, TCP_NOPUSH,
                      (const void *) &tcp_nopush, sizeof(int));
}


int ngx_tcp_push(ngx_socket_t s)
{
    int  tcp_nopush;

    tcp_nopush = 0;

    return setsockopt(s, IPPROTO_TCP, TCP_NOPUSH,
                      (const void *) &tcp_nopush, sizeof(int));
}

#elif __linux__

int ngx_tcp_nopush(ngx_socket_t s)
{
    int  cork;

    cork = 1;

    return setsockopt(s, IPPROTO_TCP, TCP_CORK,
                      (const void *) &cork, sizeof(int));
}

int ngx_tcp_push(ngx_socket_t s)
{
    int  cork;

    cork = 0;

    return setsockopt(s, IPPROTO_TCP, TCP_CORK,
                      (const void *) &cork, sizeof(int));
}

#else

int ngx_tcp_nopush(ngx_socket_t s)
{
    return NGX_OK;
}

int ngx_tcp_push(ngx_socket_t s)
{
    return NGX_OK;
}

#endif