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

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POSIX_FALLOCATE(3)		    Linux Programmer's Manual		       POSIX_FALLOCATE(3)

NAME
       posix_fallocate - allocate file space

SYNOPSIS
       #include <fcntl.h>

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

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       posix_fallocate():
	   _XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L

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 was less than 0, or len was less than or equal to 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.

VERSIONS
       posix_fallocate() is available since glibc 2.1.94.

CONFORMING TO
       POSIX.1-2001.

       POSIX.1-2008 says that an implementation shall give the EINVAL error if len was 0, or off-
       set was less than 0.  POSIX.1-2001 says that an implementation shall give the EINVAL error
       if len is less than 0, or offset was less than 0, and may give the  error  if  len  equals
       zero.

SEE ALSO
       fallocate(1), fallocate(2), lseek(2), posix_fadvise(2)

COLOPHON
       This  page  is  part of release 3.55 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/.

GNU					    2013-02-12			       POSIX_FALLOCATE(3)
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