src/port/noblock.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * noblock.c
   4  *        set a file descriptor as non-blocking
   5  *
   6  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  * IDENTIFICATION
  10  *        $PostgreSQL$
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14
  15 #include "c.h"
  16
  17 #include <fcntl.h>
  18
  19
  20 bool
  21 pg_set_noblock(int sock)
  22 {
  23 #if !defined(WIN32)
  24         return (fcntl(sock, F_SETFL, O_NONBLOCK) != -1);
  25 #else
  26         long            ioctlsocket_ret = 1;
  27
  28         /* Returns non-0 on failure, while fcntl() returns -1 on failure */
  29         return (ioctlsocket(sock, FIONBIO, &ioctlsocket_ret) == 0);
  30 #endif
  31 }
  32
  33
  34 bool
  35 pg_set_block(int sock)
  36 {
  37 #if !defined(WIN32)
  38         int                     flags;
  39
  40         flags = fcntl(sock, F_GETFL);
  41         if (flags < 0 || fcntl(sock, F_SETFL, (long) (flags & ~O_NONBLOCK)))
  42                 return false;
  43         return true;
  44 #else
  45         long            ioctlsocket_ret = 0;
  46
  47         /* Returns non-0 on failure, while fcntl() returns -1 on failure */
  48         return (ioctlsocket(sock, FIONBIO, &ioctlsocket_ret) == 0);
  49 #endif
  50 }