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



NAME
       posix_fallocate - allocate file space

SYNOPSIS
       #define _XOPEN_SOURCE 600
       #include <fcntl.h>

       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  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 of file descriptor.

VERSIONS
       posix_fallocate() is available since glibc 2.1.94.

CONFORMING TO
       POSIX.1-2001.

       POSIX.1-2001 says that an implementation shall give the EINVAL error if len was  0,
       or offset 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(2), lseek(2), posix_fadvise(2), feature_test_macros(7)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the project, and information about reporting bugs, can be found at  http://www.ker-
       nel.org/doc/man-pages/.



GNU                               2009-03-30                POSIX_FALLOCATE(3)

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