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

       posix_fallocate - allocate file space

       #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)):

           _XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L

       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.

       posix_fallocate() returns zero on success, or an error number on failure.  Note that errno
       is not set.

       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.

       posix_fallocate() is available since glibc 2.1.94.

   Multithreading (see pthreads(7))
       The posix_fallocate() function is thread-safe.


       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

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

       This  page  is  part of release 3.74 of the Linux 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/.

GNU                                         2014-06-03                         POSIX_FALLOCATE(3)

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