ftruncate(2)               DG/UX 4.30                ftruncate(2)



     NAME
          ftruncate - Truncate a file.

     SYNOPSIS
          int   ftruncate  (fildes, length)
          int             fildes;
          long            length;

     PARAMETERS
          fildes         A valid, active file descriptor.


          length         Maximum length of file after truncation.

     DESCRIPTION
          This call is similar to the truncate system call, except
          that ftruncate takes a file descriptor instead of a pathname
          to identify the file.

          Otherwise, the semantics of this call are identical to those
          of truncate.

     ACCESS CONTROL
          <Fildes> must be open for writing.

     RETURN VALUE
          0              The file was successfully truncated.


          -1             An error occurred. Errno is set to indicate
                         the error.

     EXCEPTIONS
          Errno may be set to one of the following error codes:


          EBADF          <Fildes> is not a valid, active descriptor.


          EINVAL         <Fildes> is not open for writing.


          EINVAL         <Fildes> references a socket, not a file.


          EINTR          Fcntl was interrupted while waiting for a
                         lock.

     SEE ALSO
          The related manual sections:  creat(2), open(2),
          truncate(2).




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