XRootD
XrdNetConnect.cc
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1 /******************************************************************************/
2 /* */
3 /* X r d N e t C o n n e c t . c c */
4 /* */
5 /* (c) 2004 by the Board of Trustees of the Leland Stanford, Jr., University */
6 /* All Rights Reserved */
7 /* Produced by Andrew Hanushevsky for Stanford University under contract */
8 /* DE-AC02-76-SFO0515 with the Department of Energy */
9 /* */
10 /* This file is part of the XRootD software suite. */
11 /* */
12 /* XRootD is free software: you can redistribute it and/or modify it under */
13 /* the terms of the GNU Lesser General Public License as published by the */
14 /* Free Software Foundation, either version 3 of the License, or (at your */
15 /* option) any later version. */
16 /* */
17 /* XRootD is distributed in the hope that it will be useful, but WITHOUT */
18 /* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
19 /* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */
20 /* License for more details. */
21 /* */
22 /* You should have received a copy of the GNU Lesser General Public License */
23 /* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */
24 /* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */
25 /* */
26 /* The copyright holder's institutional names and contributor's names may not */
27 /* be used to endorse or promote products derived from this software without */
28 /* specific prior written permission of the institution or contributor. */
29 /******************************************************************************/
30 
31 #include "errno.h"
32 #include "fcntl.h"
33 #ifndef WIN32
34 #include "poll.h"
35 #include "unistd.h"
36 #include <sys/types.h>
37 #include <sys/socket.h>
38 #endif
39 
40 #include "XrdNet/XrdNetConnect.hh"
41 #include "XrdSys/XrdSysPlatform.hh"
42 
43 /******************************************************************************/
44 /* C o n n e c t */
45 /******************************************************************************/
46 
48  const struct sockaddr *name,
49  int namelen,
50  int tsec)
51 {
52  int old_flags, new_flags, myRC;
53  SOCKLEN_t myRClen = sizeof(myRC);
54 
55 // If no timeout wanted, do a plain connect() which will timeout after 3
56 // minutes on most platforms.
57 //
58  if (!tsec)
59  {if (connect(fd, name, namelen)) return errno;
60  return 0;
61  }
62 
63 // If a timeout is wanted, then we must convert this file descriptor to be
64 // non-blocking so that if a connection is not made immediately we can get
65 // control back and poll for completion for the specified amount of time.
66 // Regardless of outcome we will restore the original fd settings.
67 //
68  old_flags = fcntl(fd, F_GETFL, 0);
69  new_flags = old_flags | O_NDELAY | O_NONBLOCK;
70  fcntl(fd, F_SETFL, new_flags);
71  if (!connect(fd, name, namelen)) myRC = 0;
72  else if (EINPROGRESS != net_errno) myRC = net_errno;
73  else {struct pollfd polltab = {fd, POLLOUT|POLLWRNORM, 0};
74  do {myRC = poll(&polltab, 1, tsec*1000);}
75  while(myRC < 0 && errno == EINTR);
76  if (myRC != 1) myRC = ETIMEDOUT;
77  else getsockopt(fd,SOL_SOCKET,SO_ERROR,(Sokdata_t)&myRC,&myRClen);
78  }
79  fcntl(fd, F_SETFD, old_flags);
80  return myRC;
81 }
int fcntl(int fd, int cmd,...)
#define net_errno
#define SOCKLEN_t
#define Sokdata_t
static int Connect(int fd, const struct sockaddr *name, int namelen, int tsec=-1)