xref: /curl/lib/nonblock.c (revision f81f351b)
1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9  *
10  * This software is licensed as described in the file COPYING, which
11  * you should have received as part of this distribution. The terms
12  * are also available at https://curl.se/docs/copyright.html.
13  *
14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15  * copies of the Software, and permit persons to whom the Software is
16  * furnished to do so, under the terms of the COPYING file.
17  *
18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19  * KIND, either express or implied.
20  *
21  * SPDX-License-Identifier: curl
22  *
23  ***************************************************************************/
24 
25 #include "curl_setup.h"
26 
27 #ifdef HAVE_SYS_IOCTL_H
28 #include <sys/ioctl.h>
29 #endif
30 #ifdef HAVE_FCNTL_H
31 #include <fcntl.h>
32 #endif
33 
34 #ifdef __VMS
35 #include <in.h>
36 #include <inet.h>
37 #endif
38 
39 #include "nonblock.h"
40 
41 /*
42  * curlx_nonblock() set the given socket to either blocking or non-blocking
43  * mode based on the 'nonblock' boolean argument. This function is highly
44  * portable.
45  */
curlx_nonblock(curl_socket_t sockfd,int nonblock)46 int curlx_nonblock(curl_socket_t sockfd,    /* operate on this */
47                    int nonblock   /* TRUE or FALSE */)
48 {
49 #if defined(HAVE_FCNTL_O_NONBLOCK)
50   /* most recent Unix versions */
51   int flags;
52   flags = sfcntl(sockfd, F_GETFL, 0);
53   if(flags < 0)
54     return -1;
55   /* Check if the current file status flags have already satisfied
56    * the request, if so, it is no need to call fcntl() to replicate it.
57    */
58   if(!!(flags & O_NONBLOCK) == !!nonblock)
59     return 0;
60   if(nonblock)
61     flags |= O_NONBLOCK;
62   else
63     flags &= ~O_NONBLOCK;
64   return sfcntl(sockfd, F_SETFL, flags);
65 
66 #elif defined(HAVE_IOCTL_FIONBIO)
67 
68   /* older Unix versions */
69   int flags = nonblock ? 1 : 0;
70   return ioctl(sockfd, FIONBIO, &flags);
71 
72 #elif defined(HAVE_IOCTLSOCKET_FIONBIO)
73 
74   /* Windows */
75   unsigned long flags = nonblock ? 1UL : 0UL;
76   return ioctlsocket(sockfd, (long)FIONBIO, &flags);
77 
78 #elif defined(HAVE_IOCTLSOCKET_CAMEL_FIONBIO)
79 
80   /* Amiga */
81   long flags = nonblock ? 1L : 0L;
82   return IoctlSocket(sockfd, FIONBIO, (char *)&flags);
83 
84 #elif defined(HAVE_SETSOCKOPT_SO_NONBLOCK)
85 
86   /* Orbis OS */
87   long b = nonblock ? 1L : 0L;
88   return setsockopt(sockfd, SOL_SOCKET, SO_NONBLOCK, &b, sizeof(b));
89 
90 #else
91 #  error "no non-blocking method was found/used/set"
92 #endif
93 }
94