release/src/router/nginx/src/os/unix/ngx_socket.c

   1
   2 /*
   3  * Copyright (C) Igor Sysoev
   4  * Copyright (C) Nginx, Inc.
   5  */
   6
   7
   8 #include <ngx_config.h>
   9 #include <ngx_core.h>
  10
  11
  12 /*
  13  * ioctl(FIONBIO) sets a non-blocking mode with the single syscall
  14  * while fcntl(F_SETFL, O_NONBLOCK) needs to learn the current state
  15  * using fcntl(F_GETFL).
  16  *
  17  * ioctl() and fcntl() are syscalls at least in FreeBSD 2.x, Linux 2.2
  18  * and Solaris 7.
  19  *
  20  * ioctl() in Linux 2.4 and 2.6 uses BKL, however, fcntl(F_SETFL) uses it too.
  21  */
  22
  23
  24 #if (NGX_HAVE_FIONBIO)
  25
  26 int
  27 ngx_nonblocking(ngx_socket_t s)
  28 {
  29     int  nb;
  30
  31     nb = 1;
  32
  33     return ioctl(s, FIONBIO, &nb);
  34 }
  35
  36
  37 int
  38 ngx_blocking(ngx_socket_t s)
  39 {
  40     int  nb;
  41
  42     nb = 0;
  43
  44     return ioctl(s, FIONBIO, &nb);
  45 }
  46
  47 #endif
  48
  49
  50 #if (NGX_FREEBSD)
  51
  52 int
  53 ngx_tcp_nopush(ngx_socket_t s)
  54 {
  55     int  tcp_nopush;
  56
  57     tcp_nopush = 1;
  58
  59     return setsockopt(s, IPPROTO_TCP, TCP_NOPUSH,
  60                       (const void *) &tcp_nopush, sizeof(int));
  61 }
  62
  63
  64 int
  65 ngx_tcp_push(ngx_socket_t s)
  66 {
  67     int  tcp_nopush;
  68
  69     tcp_nopush = 0;
  70
  71     return setsockopt(s, IPPROTO_TCP, TCP_NOPUSH,
  72                       (const void *) &tcp_nopush, sizeof(int));
  73 }
  74
  75 #elif (NGX_LINUX)
  76
  77
  78 int
  79 ngx_tcp_nopush(ngx_socket_t s)
  80 {
  81     int  cork;
  82
  83     cork = 1;
  84
  85     return setsockopt(s, IPPROTO_TCP, TCP_CORK,
  86                       (const void *) &cork, sizeof(int));
  87 }
  88
  89
  90 int
  91 ngx_tcp_push(ngx_socket_t s)
  92 {
  93     int  cork;
  94
  95     cork = 0;
  96
  97     return setsockopt(s, IPPROTO_TCP, TCP_CORK,
  98                       (const void *) &cork, sizeof(int));
  99 }
 100
 101 #else
 102
 103 int
 104 ngx_tcp_nopush(ngx_socket_t s)
 105 {
 106     return 0;
 107 }
 108
 109
 110 int
 111 ngx_tcp_push(ngx_socket_t s)
 112 {
 113     return 0;
 114 }
 115
 116 #endif