posix_fallocate man page on Archlinux

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       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       posix_fallocate — file space control (ADVANCED REALTIME)

       #include <fcntl.h>

       int posix_fallocate(int fd, off_t offset, off_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	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

       If  the	offset+len  is beyond the current file size, then posix_fallo‐
       cate() 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 off‐

       Upon successful completion, posix_fallocate() shall return zero; other‐
       wise, an error number 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

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

       EINTR  A signal was caught during execution.

       EINVAL The len argument is less than zero, or the  offset  argument  is
	      less  than  zero, or the underlying file system does not support
	      this operation.

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

       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 posix_fallocate() function may fail if:

       EINVAL The len argument is zero.

       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 POSIX.1‐2008, <fcntl.h>

       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  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.unix.org/online.html .

       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,	 see  https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013		   POSIX_FALLOCATE(3P)

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