libc/sysdeps/linux/common/posix_fallocate.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * posix_fallocate() for uClibc
   4  * http://www.opengroup.org/onlinepubs/9699919799/functions/posix_fallocate.html
   5  *
   6  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
   7  *
   8  * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
   9  */
  10
  11 #include <sys/syscall.h>
  12 #include <fcntl.h>
  13 #include <bits/kernel-features.h>
  14 #include <stdint.h>
  15
  16 #if defined __NR_fallocate
  17 int posix_fallocate(int fd, __off_t offset, __off_t len)
  18 {
  19         int ret;
  20
  21 # if __WORDSIZE == 32
  22         uint32_t off_low = offset;
  23         uint32_t len_low = len;
  24         /* may assert that these >>31 are 0 */
  25         uint32_t zero = 0;
  26         INTERNAL_SYSCALL_DECL(err);
  27         ret = (int) (INTERNAL_SYSCALL(fallocate, err, 6, fd, 0,
  28                 __LONG_LONG_PAIR (zero, off_low),
  29                 __LONG_LONG_PAIR (zero, len_low)));
  30 # elif __WORDSIZE == 64
  31         INTERNAL_SYSCALL_DECL(err);
  32         ret = (int) (INTERNAL_SYSCALL(fallocate, err, 4, fd, 0, offset, len));
  33 # else
  34 # error your machine is neither 32 bit or 64 bit ... it must be magical
  35 #endif
  36     if (unlikely(INTERNAL_SYSCALL_ERROR_P (ret, err)))
  37       return INTERNAL_SYSCALL_ERRNO (ret, err);
  38     return 0;
  39 }
  40 # if defined __UCLIBC_HAS_LFS__ && __WORDSIZE == 64
  41 strong_alias(posix_fallocate,posix_fallocate64)
  42 # endif
  43 #endif