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net_write.c revision 1.1.1.1 
      1 /*	$NetBSD: net_write.c,v 1.1.1.1 2011/04/13 18:15:42 elric Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska Hgskolan
      5  * (Royal Institute of Technology, Stockholm, Sweden).
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * 3. Neither the name of the Institute nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <config.h>
     37 
     38 #include <krb5/roken.h>
     39 
     40 /*
     41  * Like write but never return partial data.
     42  */
     43 
     44 #ifndef _WIN32
     45 
     46 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
     47 net_write (rk_socket_t fd, const void *buf, size_t nbytes)
     48 {
     49     const char *cbuf = (const char *)buf;
     50     ssize_t count;
     51     size_t rem = nbytes;
     52 
     53     while (rem > 0) {
     54 	count = write (fd, cbuf, rem);
     55 	if (count < 0) {
     56 	    if (errno == EINTR)
     57 		continue;
     58 	    else
     59 		return count;
     60 	}
     61 	cbuf += count;
     62 	rem -= count;
     63     }
     64     return nbytes;
     65 }
     66 
     67 #else
     68 
     69 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
     70 net_write(rk_socket_t sock, const void *buf, size_t nbytes)
     71 {
     72     const char *cbuf = (const char *)buf;
     73     ssize_t count;
     74     size_t rem = nbytes;
     75 #ifdef SOCKET_IS_NOT_AN_FD
     76     int use_write = 0;
     77 #endif
     78 
     79     while (rem > 0) {
     80 #ifdef SOCKET_IS_NOT_AN_FD
     81 	if (use_write)
     82 	    count = _write (sock, cbuf, rem);
     83 	else
     84 	    count = send (sock, cbuf, rem, 0);
     85 
     86 	if (use_write == 0 &&
     87 	    rk_IS_SOCKET_ERROR(count) &&
     88 	    (rk_SOCK_ERRNO == WSANOTINITIALISED ||
     89              rk_SOCK_ERRNO == WSAENOTSOCK)) {
     90 	    use_write = 1;
     91 
     92 	    count = _write (sock, cbuf, rem);
     93 	}
     94 #else
     95 	count = send (sock, cbuf, rem, 0);
     96 #endif
     97 	if (count < 0) {
     98 	    if (errno == EINTR)
     99 		continue;
    100 	    else
    101 		return count;
    102 	}
    103 	cbuf += count;
    104 	rem -= count;
    105     }
    106     return nbytes;
    107 }
    108 
    109 #endif
    110