mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 05:20:06 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/* Copyright (C) 2000 Free Software Foundation, Inc.
|
||
This file is part of the GNU C Library.
|
||
|
||
The GNU C Library is free software; you can redistribute it and/or
|
||
modify it under the terms of the GNU Lesser General Public
|
||
License as published by the Free Software Foundation; either
|
||
version 2.1 of the License, or (at your option) any later version.
|
||
|
||
The GNU C Library is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
Lesser General Public License for more details.
|
||
|
||
You should have received a copy of the GNU Lesser General Public
|
||
License along with the GNU C Library; if not, write to the Free
|
||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||
02111-1307 USA. */
|
||
|
||
#include <errno.h>
|
||
#include <fcntl.h>
|
||
#include <unistd.h>
|
||
#include <sys/stat.h>
|
||
#include <sys/statfs.h>
|
||
|
||
/* Reserve storage for the data of the file associated with FD. */
|
||
|
||
int
|
||
posix_fallocate (int fd, __off_t offset, size_t len)
|
||
{
|
||
struct stat64 st;
|
||
struct statfs f;
|
||
size_t step;
|
||
|
||
/* `off_t´ is a signed type. Therefore we can determine whether
|
||
OFFSET + LEN is too large if it is a negative value. */
|
||
if (offset < 0 || len == 0)
|
||
return EINVAL;
|
||
if (offset + len < 0)
|
||
return EFBIG;
|
||
|
||
/* First thing we have to make sure is that this is really a regular
|
||
file. */
|
||
if (__fxstat64 (_STAT_VER, fd, &st) != 0)
|
||
return EBADF;
|
||
if (S_ISFIFO (st.st_mode))
|
||
return ESPIPE;
|
||
if (! S_ISREG (st.st_mode))
|
||
return ENODEV;
|
||
|
||
/* We have to know the block size of the filesystem to get at least some
|
||
sort of performance. */
|
||
if (__fstatfs (fd, &f) != 0)
|
||
return errno;
|
||
|
||
/* Align OFFSET to block size and adjust LEN. */
|
||
step = (offset + f.f_bsize - 1) % ~f.f_bsize;
|
||
offset += step;
|
||
|
||
/* Write something to every block. */
|
||
while (len > step)
|
||
{
|
||
len -= step;
|
||
|
||
if (__pwrite (fd, "", 1, offset) != 1)
|
||
return errno;
|
||
|
||
offset += step;
|
||
}
|
||
|
||
return 0;
|
||
}
|