posix_fallocate(3p) - phpMan

POSIX_FALLOCATE(P)                                          POSIX_FALLOCATE(P)



NAME
       posix_fallocate - file space control (ADVANCED REALTIME)

SYNOPSIS
       #include <fcntl.h>

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


DESCRIPTION
       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  storage 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 strategy.

       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.

RETURN VALUE
       Upon  successful  completion,  posix_fallocate()  shall  return zero; otherwise, an
       error number shall be returned to indicate the error.

ERRORS
       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.

EXAMPLES
       None.

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

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

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

COPYRIGHT
       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  original  Standard  can   be   obtained   online   at
       http://www.opengroup.org/unix/online.html .



POSIX                                2003                   POSIX_FALLOCATE(P)

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