LSEEK(S)                 XENIX System V                  LSEEK(S)



     Name
          lseek - Moves read/write file pointer.

     Syntax
          long lseek (fildes, offset, whence)
          int fildes;
          long offset;
          int whence;

     Description
          fildes is a file descriptor returned from a creat, open,
          dup, or fcntl system call.  lseek sets the file pointer
          associated with fildes as follows:

          If whence is 0, the pointer is set to offset bytes.

          If whence is 1, the pointer is set to its current location
          plus offset.

          If whence is 2, the pointer is set to the size of the file
          plus offset.

          Upon successful completion, the resulting pointer location
          as measured in bytes from the beginning of the file is
          returned.

          lseek will fail and the file pointer will remain unchanged
          if one or more of the following are true:

               fildes is not an open file descriptor.  [EBADF]

               fildes is associated with a pipe or fifo.  [ESPIPE]

               whence is not 0, 1 or 2.  [EINVAL and SIGSYS signal]

               The resulting file pointer would be negative.  [EINVAL]

          Some devices are incapable of seeking.  The value of the
          file pointer associated with such a device is undefined.

     Return Value
          Upon successful completion, a nonnegative integer indicating
          the file pointer value is returned.  Otherwise, a value of
          -1 is returned and errno is set to indicate the error.

     See Also
          creat(S), dup(S), fcntl(S), open(S)








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