1                 : /*
       2                 :  * Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska Högskolan
       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 <config.h>
      35                 : 
      36                 : #include "roken.h"
      37                 : 
      38                 : /*
      39                 :  * Like read but never return partial data.
      40                 :  */
      41                 : 
      42                 : #ifndef _WIN32
      43                 : 
      44                 : ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
      45                 : net_read (rk_socket_t fd, void *buf, size_t nbytes)
      46               0 : {
      47               0 :     char *cbuf = (char *)buf;
      48                 :     ssize_t count;
      49               0 :     size_t rem = nbytes;
      50                 : 
      51               0 :     while (rem > 0) {
      52               0 :         count = read (fd, cbuf, rem);
      53               0 :         if (count < 0) {
      54               0 :             if (errno == EINTR)
      55               0 :                 continue;
      56                 :             else
      57               0 :                 return count;
      58               0 :         } else if (count == 0) {
      59               0 :             return count;
      60                 :         }
      61               0 :         cbuf += count;
      62               0 :         rem -= count;
      63                 :     }
      64               0 :     return nbytes;
      65                 : }
      66                 : 
      67                 : #else
      68                 : 
      69                 : ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
      70                 : net_read(rk_socket_t sock, void *buf, size_t nbytes)
      71                 : {
      72                 :     char *cbuf = (char *)buf;
      73                 :     ssize_t count;
      74                 :     size_t rem = nbytes;
      75                 : 
      76                 :     while (rem > 0) {
      77                 :         count = recv (sock, cbuf, rem, 0);
      78                 :         if (count < 0) {
      79                 : 
      80                 :             /* With WinSock, the error EINTR (WSAEINTR), is used to
      81                 :                indicate that a blocking call was cancelled using
      82                 :                WSACancelBlockingCall(). */
      83                 : 
      84                 : #ifndef HAVE_WINSOCK
      85                 :             if (rk_SOCK_ERRNO == EINTR)
      86                 :                 continue;
      87                 : #endif
      88                 :             return count;
      89                 :         } else if (count == 0) {
      90                 :             return count;
      91                 :         }
      92                 :         cbuf += count;
      93                 :         rem -= count;
      94                 :     }
      95                 :     return nbytes;
      96                 : }
      97                 : 
      98                 : #endif