089d05d5c2
2003-08-22 Ulrich Drepper <drepper@redhat.com> * io/fcntl.h (posix_fallocate): Change type of third parameter to off_t. (posix_fallocate64): Change type of third parameter to off64_t. * sysdeps/generic/posix_fallocate.c: Adjust for type change. * sysdeps/posix/posix_fallocate.c: Likewise. * sysdeps/generic/posix_fallocate64.c: Likewise. * sysdeps/posix/posix_fallocate64.c: Likewise. Add compatibility code for 32-bit platforms. * sysdeps/unix/sysv/linux/i386/Versions: Add new version for posix_fallocate64. * sysdeps/unix/sysv/linux/powerpc/powerpc32/Versions: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/Versions: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/Versions: Likewise.
72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/* Copyright (C) 2000, 2003 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, __off_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;
|
||
}
|