POSIX_FALLOCATE(3)	   Linux Programmers Manual	   POSIX_FALLOCATE(3)



NAME
       posix_fallocate - allocate file space

SYNOPSIS
       #define _XOPEN_SOURCE 600
       #include 

       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  fail
       ure.  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 3.05 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				  2008-03-03		    POSIX_FALLOCATE(3)