usr.sbin/bhyve/sockstream.c

   1 /*-
   2  * Copyright (c) 2015 Nahanni Systems, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/types.h>
  33 #include <unistd.h>
  34
  35 #include <errno.h>
  36
  37 #include "sockstream.h"
  38
  39 ssize_t
  40 stream_read(int fd, void *buf, ssize_t nbytes)
  41 {
  42         uint8_t *p;
  43         ssize_t len = 0;
  44         ssize_t n;
  45
  46         p = buf;
  47
  48         while (len < nbytes) {
  49                 n = read(fd, p + len, nbytes - len);
  50                 if (n == 0)
  51                         break;
  52
  53                 if (n < 0) {
  54                         if (errno == EINTR || errno == EAGAIN)
  55                                 continue;
  56                         return (n);
  57                 }
  58                 len += n;
  59         }
  60         return (len);
  61 }
  62
  63 ssize_t
  64 stream_write(int fd, const void *buf, ssize_t nbytes)
  65 {
  66         const uint8_t *p;
  67         ssize_t len = 0;
  68         ssize_t n;
  69
  70         p = buf;
  71
  72         while (len < nbytes) {
  73                 n = write(fd, p + len, nbytes - len);
  74                 if (n == 0)
  75                         break;
  76                 if (n < 0) {
  77                         if (errno == EINTR || errno == EAGAIN)
  78                                 continue;
  79                         return (n);
  80                 }
  81                 len += n;
  82         }
  83         return (len);
  84 }
  85
  86