ps3sm/dev.c

   1 /*-
   2  * Copyright (C) 2011, 2012 glevand <geoffrey.levand@mail.ru>
   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  *    without modification, immediately at the beginning of the file.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <stdint.h>
  30 #include <errno.h>
  31
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <fcntl.h>
  35 #include <unistd.h>
  36
  37 #include "ps3sm_msg.h"
  38 #include "dev.h"
  39
  40 static int fd = -1;
  41
  42 int
  43 dev_open(const char *device)
  44 {
  45         if (fd >= 0)
  46                 close(fd);
  47
  48         fd = open(device, O_RDWR);
  49         if (fd < 0)
  50                 return (-1);
  51
  52         return (0);
  53 }
  54
  55 void
  56 dev_close(void)
  57 {
  58         if (fd >= 0)
  59                 close(fd);
  60 }
  61
  62 int
  63 dev_write(const void *buf, size_t len)
  64 {
  65         if (fd < 0)
  66                 return (-1);
  67
  68         return (write(fd, buf, len));
  69 }
  70
  71 int
  72 dev_read(void *buf, size_t len)
  73 {
  74         char tmp[4096];
  75         struct ps3sm_header *hdr;
  76         int ret;
  77
  78         if (fd < 0)
  79                 return (-1);
  80
  81         hdr = (struct ps3sm_header *) tmp;
  82
  83         while (1) {
  84                 ret = read(fd, hdr, sizeof(*hdr));
  85                 if (ret < 0) {
  86                         if (errno != EAGAIN)
  87                                 return (-1);
  88                 } else if (ret > 0) {
  89                         break;
  90                 }
  91         }
  92
  93         while (1) {
  94                 ret = read(fd, hdr + 1, hdr->payload_length);
  95                 if (ret < 0) {
  96                         if (errno != EAGAIN)
  97                                 return (-1);
  98                 } else if (ret > 0) {
  99                         break;
 100                 }
 101         }
 102
 103         if (len > (sizeof(*hdr) + hdr->payload_length))
 104                 len = sizeof(*hdr) + hdr->payload_length;
 105
 106         memcpy(buf, tmp, len);
 107
 108         return (len);
 109 }