Name

posix_fallocate — allocate file space

Synopsis

#define _XOPEN_SOURCE 600
#include <fcnlt.h>
int posix_fallocate( int   fd,
  off_t   offset,
  off_t   len);

DESCRIPTION

The function posix_fallocate() ensures that disk space is allocated for the file referred to by the descriptor fd for the bytes in the range starting at offset and continuing for len bytes. After a successful call to posix_fallocate(), subsequent writes to bytes in the specified range are guaranteed not to fail because of lack of disk space.

If the size of the file is less than offset+len, then the file is increased to this size; otherwise the file size is left unchanged.

RETURN VALUE

posix_fallocate() returns zero on success, or an error number on failure. Note that errno is not set.

ERRORS

EBADF

fd is not a valid file descriptor, or is not opened for writing.

EFBIG

offset+len exceeds the maximum file size.

EINVAL

offset or len was less than 0.

ENODEV

fd does not refer to a regular file.

ENOSPC

There is not enough space left on the device containing the file referred to by fd.

ESPIPE

fd refers to a pipe of file descriptor.

VERSIONS

posix_fallocate() is available since glibc 2.1.94.

CONFORMING TO

POSIX.1-2001.

SEE ALSO

fallocate(2), lseek(2), posix_fadvise(2), feature_test_macros(7)

COLOPHON

This page is part of release 2.79 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


  Copyright (c) 2006, Michael Kerrisk <mtk.manpagesgmail.com>

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