qnx-notes

Linux磁盘测试的源代码,测试磁盘的读写性能

	QNX Specific Notes:
	-------------------
     o	The Makefile is setup for building 'dt' using the flat memory
	model.  This can be changed to compact model for running on
	non-32bit QNX systems (also remove -D_QNX_32BIT).

     o	There are numerous 'dt' scripts used to help automate testing,
	but they were written to use C-Shell which is not shipped with
	QNX.  I downloaded 'tcsh' from QUICS, which appears to work Ok.
	[ BTW:  None of these scripts are required to run 'dt'. ]

     o	Some 'dt' tests are not built into the QNX version at this
	time, since these features are not currently supported.  This
	includes POSIX AIO (-DAIO), memory mapped files (-DMMAP), and
	tape specific tests (in dttape.c), which require the MTIOCTOP
	ioctl() command.

------------------------------------------------------------------------------

November 21, 1994 - Robin Miller.

	Finally upgraded to QNX 4.2 and built 'dt' with Watcom 9.52 compiler
kit.  The default build is flat memory model, for 32-bit systems.

	Fixed problem waiting for child processes.  Turns out, POSIX allows
SIGCHLD to be handled differently depending on SIG_IGN or SIG_DFL setting.
For QNX, SIGCHLD signal had to be set to SIG_DFL to work properly for 'dt'.

-------------------------------------------------------------------------------

October 6, 1993 - Robin Miller

	The "files=" option can only be used to read multiple tape files,
since no support exists for writing file marks in this version of 'dt'.  I
haven't actually tested this on QNX tape devices, since I don't have any,
but it has been tested on SunOS, ULTRIX, and DEC OSF/1 systems.

	The scripts supplied with 'dt' are written to use C-shell, but work
just fine with 'tcsh' which is available on QUICS.  I just create a link
from 'tcsh' to 'csh' in /bin.  Some of the scripts may need changed a little
to run properly on QNX, since they were written for BSD-Unix like systems.
They should serve as good templates however, incase you're not a shell script
writing expert (neither am I).