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      1 /*	$NetBSD: net_write.c,v 1.3 2023/06/19 21:41:45 christos 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 blocking sockets never return partial data, i.e. we retry on
     42  * EINTR.  With non-blocking sockets (EWOULDBLOCK or EAGAIN) we return the
     43  * number of bytes written.
     44  */
     45 
     46 #ifndef _WIN32
     47 
     48 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
     49 net_write (rk_socket_t fd, const void *buf, size_t nbytes)
     50 {
     51     const char *cbuf = (const char *)buf;
     52     ssize_t count;
     53     size_t rem = nbytes;
     54 
     55     while (rem > 0) {
     56 	count = write (fd, cbuf, rem);
     57 	if (count < 0) {
     58             switch (errno) {
     59             case EINTR:
     60 		continue;
     61 #if defined(EAGAIN) && EAGAIN != EWOULDBLOCK
     62             case EAGAIN:
     63 #endif
     64             case EWOULDBLOCK:
     65                 return nbytes - rem;
     66             default:
     67 		return count;
     68             }
     69 	}
     70 	cbuf += count;
     71 	rem -= count;
     72     }
     73     return nbytes;
     74 }
     75 
     76 #else
     77 
     78 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
     79 net_write(rk_socket_t sock, const void *buf, size_t nbytes)
     80 {
     81     const char *cbuf = (const char *)buf;
     82     ssize_t count;
     83     size_t rem = nbytes;
     84 #ifdef SOCKET_IS_NOT_AN_FD
     85     int use_write = 0;
     86 #endif
     87 
     88     while (rem > 0) {
     89 #ifdef SOCKET_IS_NOT_AN_FD
     90 	if (use_write)
     91 	    count = _write (sock, cbuf, rem);
     92 	else
     93 	    count = send (sock, cbuf, rem, 0);
     94 
     95 	if (use_write == 0 &&
     96 	    rk_IS_SOCKET_ERROR(count) &&
     97 	    (rk_SOCK_ERRNO == WSANOTINITIALISED ||
     98              rk_SOCK_ERRNO == WSAENOTSOCK)) {
     99 	    use_write = 1;
    100 
    101 	    count = _write (sock, cbuf, rem);
    102 	}
    103 #else
    104 	count = send (sock, cbuf, rem, 0);
    105 #endif
    106 	if (count < 0) {
    107             if (!use_write) {
    108                 switch (rk_SOCK_ERRNO) {
    109                 case WSAEINTR:
    110                     continue;
    111                 case WSAEWOULDBLOCK:
    112                     return nbytes - rem;
    113                 default:
    114                     return count;
    115                 }
    116             } else {
    117                 switch (errno) {
    118                 case EINTR:
    119                     continue;
    120                 case EWOULDBLOCK:
    121                     return nbytes - rem;
    122                 default:
    123                     return count;
    124                 }
    125             }
    126 	}
    127 	cbuf += count;
    128 	rem -= count;
    129     }
    130     return nbytes;
    131 }
    132 
    133 #endif
    134