90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/* Copyright (C) 2000, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/statfs.h>
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/* Reserve storage for the data of the file associated with FD. */
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int
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__posix_fallocate64_l64 (int fd, __off64_t offset, __off64_t len)
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{
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struct stat64 st;
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struct statfs64 f;
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size_t step;
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/* `off64_t´ is a signed type. Therefore we can determine whether
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OFFSET + LEN is too large if it is a negative value. */
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if (offset < 0 || len < 0)
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return EINVAL;
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if (offset + len < 0)
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return EFBIG;
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/* First thing we have to make sure is that this is really a regular
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file. */
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if (__fxstat64 (_STAT_VER, fd, &st) != 0)
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return EBADF;
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if (S_ISFIFO (st.st_mode))
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return ESPIPE;
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if (! S_ISREG (st.st_mode))
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return ENODEV;
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/* We have to know the block size of the filesystem to get at least some
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sort of performance. */
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if (__fstatfs64 (fd, &f) != 0)
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return errno;
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/* Align OFFSET to block size and adjust LEN. */
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step = (offset + f.f_bsize - 1) % ~f.f_bsize;
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offset += step;
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/* Write something to every block. */
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while (len > step)
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{
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len -= step;
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if (__pwrite64 (fd, "", 1, offset) != 1)
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return errno;
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offset += step;
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}
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return 0;
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}
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#include <shlib-compat.h>
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#include <bits/wordsize.h>
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#if __WORDSIZE == 32 && SHLIB_COMPAT(libc, GLIBC_2_2, GLIBC_2_3_3)
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int
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__posix_fallocate64_l32 (int fd, off64_t offset, size_t len)
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{
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return __posix_fallocate64_l64 (fd, offset, len);
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}
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versioned_symbol (libc, __posix_fallocate64_l64, posix_fallocate64,
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GLIBC_2_3_3);
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compat_symbol (libc, __posix_fallocate64_l32, posix_fallocate64, GLIBC_2_2);
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#else
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strong_alias (__posix_fallocate64_l64, posix_fallocate64);
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#endif
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