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Linux 2.6 - man page for posix_fallocate (linux section 3posix)

POSIX_FALLOCATE(P)		    POSIX Programmer's Manual		       POSIX_FALLOCATE(P)

       posix_fallocate - file space control (ADVANCED REALTIME)

       #include <fcntl.h>

       int posix_fallocate(int fd, off_t offset, size_t len);

       The  posix_fallocate()  function  shall	ensure that any required storage for regular file
       data starting at offset and continuing for len bytes is allocated on the file system stor-
       age  media.  If posix_fallocate() returns successfully, subsequent writes to the specified
       file data shall not fail due to the lack of free space on the file system storage media.

       If the offset+ len is beyond the current file size, then  posix_fallocate()  shall  adjust
       the file size to offset+ len. Otherwise, the file size shall not be changed.

       It is implementation-defined whether a previous posix_fadvise() call influences allocation

       Space allocated via posix_fallocate() shall be freed by a successful call  to  creat()  or
       open()  that  truncates the size of the file. Space allocated via posix_fallocate() may be
       freed by a successful call to ftruncate() that reduces the file size  to  a  size  smaller
       than offset+ len.

       Upon  successful completion, posix_fallocate() shall return zero; otherwise, an error num-
       ber shall be returned to indicate the error.

       The posix_fallocate() function shall fail if:

       EBADF  The fd argument is not a valid file descriptor.

       EBADF  The fd argument references a file that was opened without write permission.

       EFBIG  The value of offset+ len is greater than the maximum file size.

       EINTR  A signal was caught during execution.

       EINVAL The len argument was zero or the offset argument was less than zero.

       EIO    An I/O error occurred while reading from or writing to a file system.

       ENODEV The fd argument does not refer to a regular file.

       ENOSPC There is insufficient free space remaining on the file system storage media.

       ESPIPE The fd argument is associated with a pipe or FIFO.

       The following sections are informative.


       The posix_fallocate() function is part of the Advisory Information option and need not  be
       provided on all implementations.



       creat()	 ,   ftruncate()   ,   open()  ,  unlink()  ,  the  Base  Definitions  volume  of
       IEEE Std 1003.1-2001, <fcntl.h>

       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003			       POSIX_FALLOCATE(P)

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