xref: /freebsd/crypto/heimdal/lib/krb5/net_write.c (revision f7c4bd95ba735bd6a5454b4953945a99cefbb80c)
1 /*
2  * Copyright (c) 1997, 1998 Kungliga Tekniska H�gskolan
3  * (Royal Institute of Technology, Stockholm, Sweden).
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  *
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * 3. Neither the name of the Institute nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #include "krb5_locl.h"
35 
36 RCSID("$Id: net_write.c 13863 2004-05-25 21:46:46Z lha $");
37 
38 krb5_ssize_t KRB5_LIB_FUNCTION
39 krb5_net_write (krb5_context context,
40 		void *p_fd,
41 		const void *buf,
42 		size_t len)
43 {
44   int fd = *((int *)p_fd);
45 
46   return net_write (fd, buf, len);
47 }
48 
49 krb5_ssize_t KRB5_LIB_FUNCTION
50 krb5_net_write_block(krb5_context context,
51 		     void *p_fd,
52 		     const void *buf,
53 		     size_t len,
54 		     time_t timeout)
55 {
56   int fd = *((int *)p_fd);
57   int ret;
58   struct timeval tv, *tvp;
59   const char *cbuf = (const char *)buf;
60   size_t rem = len;
61   ssize_t count;
62   fd_set wfds;
63 
64   do {
65       FD_ZERO(&wfds);
66       FD_SET(fd, &wfds);
67 
68       if (timeout != 0) {
69 	  tv.tv_sec = timeout;
70 	  tv.tv_usec = 0;
71 	  tvp = &tv;
72       } else
73 	  tvp = NULL;
74 
75       ret = select(fd + 1, NULL, &wfds, NULL, tvp);
76       if (ret < 0) {
77 	  if (errno == EINTR)
78 	      continue;
79 	  return -1;
80       } else if (ret == 0)
81 	  return 0;
82 
83       if (!FD_ISSET(fd, &wfds)) {
84 	  errno = ETIMEDOUT;
85 	  return -1;
86       }
87 
88 #ifdef WIN32
89       count = send (fd, cbuf, rem, 0);
90 #else
91       count = write (fd, cbuf, rem);
92 #endif
93       if (count < 0) {
94 	  if (errno == EINTR)
95 	      continue;
96 	  else
97 	      return count;
98       }
99       cbuf += count;
100       rem -= count;
101 
102   } while (rem > 0);
103 
104   return len;
105 }
106