src/port/pipe.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * pipe.c
   4  *        pipe()
   5  *
   6  * Copyright (c) 1996-2008, PostgreSQL Global Development Group
   7  *
   8  *      This is a replacement version of pipe for Win32 which allows
   9  *      returned handles to be used in select(). Note that read/write calls
  10  *      must be replaced with recv/send.
  11  *
  12  * IDENTIFICATION
  13  *        $PostgreSQL$
  14  *
  15  *-------------------------------------------------------------------------
  16  */
  17
  18 #include "postgres.h"
  19
  20 #ifdef WIN32
  21 int
  22 pgpipe(int handles[2])
  23 {
  24         SOCKET          s;
  25         struct sockaddr_in serv_addr;
  26         int                     len = sizeof(serv_addr);
  27
  28         handles[0] = handles[1] = INVALID_SOCKET;
  29
  30         if ((s = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
  31         {
  32                 ereport(LOG, (errmsg_internal("pgpipe failed to create socket: %ui", WSAGetLastError())));
  33                 return -1;
  34         }
  35
  36         memset((void *) &serv_addr, 0, sizeof(serv_addr));
  37         serv_addr.sin_family = AF_INET;
  38         serv_addr.sin_port = htons(0);
  39         serv_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
  40         if (bind(s, (SOCKADDR *) & serv_addr, len) == SOCKET_ERROR)
  41         {
  42                 ereport(LOG, (errmsg_internal("pgpipe failed to bind: %ui", WSAGetLastError())));
  43                 closesocket(s);
  44                 return -1;
  45         }
  46         if (listen(s, 1) == SOCKET_ERROR)
  47         {
  48                 ereport(LOG, (errmsg_internal("pgpipe failed to listen: %ui", WSAGetLastError())));
  49                 closesocket(s);
  50                 return -1;
  51         }
  52         if (getsockname(s, (SOCKADDR *) & serv_addr, &len) == SOCKET_ERROR)
  53         {
  54                 ereport(LOG, (errmsg_internal("pgpipe failed to getsockname: %ui", WSAGetLastError())));
  55                 closesocket(s);
  56                 return -1;
  57         }
  58         if ((handles[1] = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
  59         {
  60                 ereport(LOG, (errmsg_internal("pgpipe failed to create socket 2: %ui", WSAGetLastError())));
  61                 closesocket(s);
  62                 return -1;
  63         }
  64
  65         if (connect(handles[1], (SOCKADDR *) & serv_addr, len) == SOCKET_ERROR)
  66         {
  67                 ereport(LOG, (errmsg_internal("pgpipe failed to connect socket: %ui", WSAGetLastError())));
  68                 closesocket(s);
  69                 return -1;
  70         }
  71         if ((handles[0] = accept(s, (SOCKADDR *) & serv_addr, &len)) == INVALID_SOCKET)
  72         {
  73                 ereport(LOG, (errmsg_internal("pgpipe failed to accept socket: %ui", WSAGetLastError())));
  74                 closesocket(handles[1]);
  75                 handles[1] = INVALID_SOCKET;
  76                 closesocket(s);
  77                 return -1;
  78         }
  79         closesocket(s);
  80         return 0;
  81 }
  82
  83
  84 int
  85 piperead(int s, char *buf, int len)
  86 {
  87         int                     ret = recv(s, buf, len, 0);
  88
  89         if (ret < 0 && WSAGetLastError() == WSAECONNRESET)
  90                 /* EOF on the pipe! (win32 socket based implementation) */
  91                 ret = 0;
  92         return ret;
  93 }
  94
  95 #endif