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-.TH POSIX_FALLOCATE 3 2015-01-22 "GNU" "Linux Programmer's Manual"
-.SH NAME
-posix_fallocate \- allocate file space
-.SH SYNOPSIS
-.nf
-.B #include <fcntl.h>
-.sp
-.BI "int posix_fallocate(int " fd ", off_t " offset ", off_t " len );
-.fi
-.sp
-.ad l
-.in -4n
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.in
-.sp
-.BR posix_fallocate ():
-.RS 4
-_XOPEN_SOURCE\ >=\ 600 || _POSIX_C_SOURCE\ >=\ 200112L
-.RE
-.ad
-.SH DESCRIPTION
-The function
-.BR posix_fallocate ()
-ensures that disk space is allocated for the file referred to by the
-descriptor
-.I fd
-for the bytes in the range starting at
-.I offset
-and continuing for
-.I len
-bytes.
-After a successful call to
-.BR 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
-.IR offset + len ,
-then the file is increased to this size;
-otherwise the file size is left unchanged.
-.SH RETURN VALUE
-.BR posix_fallocate ()
-returns zero on success, or an error number on failure.
-Note that
-.I errno
-is not set.
-.SH ERRORS
-.TP
-.B EBADF
-.I fd
-is not a valid file descriptor, or is not opened for writing.
-.TP
-.B EFBIG
-.I offset+len
-exceeds the maximum file size.
-.TP
-.B EINVAL
-.I offset
-was less than 0, or
-.I len
-was less than or equal to 0.
-.TP
-.B ENODEV
-.I fd
-does not refer to a regular file.
-.TP
-.B ENOSPC
-There is not enough space left on the device containing the file
-referred to by
-.IR fd .
-.TP
-.B ESPIPE
-.I fd
-refers to a pipe.
-.SH VERSIONS
-.BR posix_fallocate ()
-is available since glibc 2.1.94.
-.SH ATTRIBUTES
-.SS Multithreading (see pthreads(7))
-The
-.BR posix_fallocate ()
-function is thread-safe.
-.SH CONFORMING TO
-POSIX.1-2001.
-
-POSIX.1-2008 says that an implementation
-.I shall
-give the
-.B EINVAL
-error if
-.I len
-was 0, or
-.I offset
-was less than 0.
-POSIX.1-2001 says that an implementation
-.I shall
-give the
-.B EINVAL
-error if
-.I len
-is less than 0, or
-.I offset
-was less than 0, and
-.I may
-give the error if
-.I len
-equals zero.
-.SH NOTES
-In the glibc implementation,
-.BR posix_fallocate ()
-is implemented using
-.BR fallocate (2).
-.SH SEE ALSO
-.BR fallocate (1),
-.BR fallocate (2),
-.BR lseek (2),
-.BR posix_fadvise (2)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.
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