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

   1 /*
   2  * Copyright 2002-2008, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include <fs_interface.h>
   8 #include <NodeMonitor.h>
   9
  10 #include <unistd.h>
  11 #include <syscalls.h>
  12 #include <errno.h>
  13
  14 #include <errno_private.h>
  15
  16
  17 #define RETURN_AND_SET_ERRNO(err) \
  18         if (err < 0) { \
  19                 __set_errno(err); \
  20                 return -1; \
  21         } \
  22         return err;
  23
  24
  25 int
  26 truncate(const char *path, off_t newSize)
  27 {
  28         struct stat stat;
  29         status_t status;
  30
  31         stat.st_size = newSize;
  32         status = _kern_write_stat(-1, path, true, &stat, sizeof(struct stat),
  33                 B_STAT_SIZE);
  34
  35         RETURN_AND_SET_ERRNO(status);
  36 }
  37
  38
  39 int
  40 ftruncate(int fd, off_t newSize)
  41 {
  42         struct stat stat;
  43         status_t status;
  44
  45         stat.st_size = newSize;
  46         status = _kern_write_stat(fd, NULL, false, &stat, sizeof(struct stat),
  47                 B_STAT_SIZE);
  48
  49         RETURN_AND_SET_ERRNO(status);
  50 }
  51