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<hr><p align="left"><small>发信人: fion (fion), 信区: UNP <br>

标  题: unix socket faq (7) <br>

发信站: UNIX编程 (2001年07月07日09:48:28 星期六), 站内信件 <br>

  <br>

 6.  Advanced Socket Programming <br>

  <br>

6.1.  How would I put my socket in non-blocking mode? <br>

  From Andrew Gierth (andrew@erlenstar.demon.co.uk): <br>

  Technically, fcntl(soc, F_SETFL, O_NONBLOCK) is incorrect since it <br>

  clobbers all other file flags. Generally one gets away with it since <br>

  the other flags (O_APPEND for example) don't really apply much to <br>

  sockets. In a similarly rough vein, you would use fcntl(soc, F_SETFL, <br>

  0) to go back to blocking mode. <br>

  To do it right, use F_GETFL to get the current flags, set or clear the <br>

  O_NONBLOCK flag, then use F_SETFL to set the flags. <br>

  And yes, the flag can be changed either way at will. <br>

  <br>

6.2.  How can I put a timeout on connect()? <br>

  Andrew Gierth (andrew@erlenstar.demon.co.uk) has outlined the <br>

  following procedure for using select() with connect(), which will <br>

  allow you to put a timeout on the connect() call: <br>

  First, create the socket and put it into non-blocking mode, then call <br>

  connect(). There are three possibilities: <br>



  o  connect succeeds: the connection has been successfully made (this <br>

     usually only happens when connecting to the same machine) <br>

  o  connect fails: obvious <br>

  o  connect returns -1/EINPROGRESS. The connection attempt has begun, <br>

     but not yet completed. <br>

  If the connection succeeds: <br>

  o  the socket will select() as writable (and will also select as <br>

     readable if data arrives) <br>

  If the connection fails: <br>

  o  the socket will select as readable *and* writable, but either a <br>

     read or write will return the error code from the connection <br>

     attempt. Also, you can use getsockopt(SO_ERROR) to get the error <br>

     status - but be careful; some systems return the error code in the <br>

     result parameter of getsockopt(), but others (incorrectly) cause <br>

     the getsockopt call itself to fail with the stored value as the <br>

     error. <br>

  Sample code that illustrates this can be found in the socket-faq <br>

  examples, in the file connect.c. <br>

-- <br>

※ 来源:·UNIX编程 www.tiaozhan.com/unixbbs/·[FROM: 211.69.197.132] <br>

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