src/system/libroot/posix/unistd/read.c

   1 /*
   2  * Copyright 2001, Manuel J. Petit. All rights reserved.
   3  * Distributed under the terms of the NewOS License.
   4  */
   5
   6 /*
   7  * Copyright 2002-2007, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
   8  * Distributed under the terms of the MIT License.
   9  */
  10
  11
  12 #include <unistd.h>
  13
  14 #include <errno.h>
  15 #include <pthread.h>
  16
  17 #include <syscall_utils.h>
  18
  19 #include <errno_private.h>
  20 #include <syscalls.h>
  21
  22
  23 ssize_t
  24 read(int fd, void* buffer, size_t bufferSize)
  25 {
  26         ssize_t status = _kern_read(fd, -1, buffer, bufferSize);
  27
  28         RETURN_AND_SET_ERRNO_TEST_CANCEL(status);
  29 }
  30
  31
  32 ssize_t
  33 read_pos(int fd, off_t pos, void* buffer, size_t bufferSize)
  34 {
  35         if (pos < 0)
  36                 RETURN_AND_SET_ERRNO_TEST_CANCEL(B_BAD_VALUE);
  37
  38         RETURN_AND_SET_ERRNO_TEST_CANCEL(_kern_read(fd, pos, buffer, bufferSize));
  39 }
  40
  41
  42 ssize_t
  43 pread(int fd, void* buffer, size_t bufferSize, off_t pos)
  44 {
  45         if (pos < 0)
  46                 RETURN_AND_SET_ERRNO_TEST_CANCEL(B_BAD_VALUE);
  47
  48         RETURN_AND_SET_ERRNO_TEST_CANCEL(_kern_read(fd, pos, buffer, bufferSize));
  49 }