/contrib/ntp/html/build/hints/aix
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- Problem with recent ANSI compilers
- On some systems, including AIX, the compiler quits on the ntp_refclock.c
- file when processing the refclock_report() routine. The problem, which
- is eithre a feature or a bug, has to do with an unwanted promotion of
- the u_char argument to an int and a failure of the compiler to recognize
- the preceding prototype. A workaround is to use ANSI syntax to delare
- the arguments. Since ANSI compilers are not universally available, this
- syntax can't be used in the stock distribution.
- (Message # 60: 2884 bytes, New)
- Date: Sat, 19 Aug 1995 13:20:50 -0400
- From: "R. Bernstein" <rocky@panix.com>
- Newsgroups: comp.protocols.time.ntp
- to: mills@udel.edu
- return-receipt-to: rocky@panix.com
- Subject: time and AIX 3.2.5 raw tty bug
-
- This posting isn't strictly about NTP, any program that may stop the
- clock or set the clock backwards is subject to the AIX 3.2.5 bug.
-
- On AIX 3.2.5, there is a bug in the tty driver for a raw device which
- may crash the box under certain conditions: basically a read() on a
- raw tty in effect, a character was read but not as many as specified
- by VMIN when a read timeout occurred. VTIME specifies the timeout. See
- the AIX manual page on termios.h or that include file. for Information
- on VMIN (or MIN) VTIME (or TIME).
-
- A remedy other than to not use raw tty's is to apply patch U435110.
-
- Details of the problem report follow.
-
- > ABSTRACT:
- > IX43779: TRAP IN PSX_TIMEO
- >
- > ORIGINATING DETAILS:
- > Stacktrace shows:
- > IAR: 01460214 posixdd:psx_timeo + 8bf4: ti 4,r12,0x0
- > *LR: 014601a0 posixdd:psx_timeo + 8b80
- > 00212c60: 014604f4 posixdd:psx_timer + 8ed4
- > 00212cc0: 0144b74c ttydd:tty_do_offlevel + 4284
- > 00212d20: 000216fc .i_offlevel + 8c
- > 00212d70: 00021d78 .i_softint + c8
- > 00001004: 00008714 .finish_interrupt + 80
- >
- > RESPONDER SUMMARY:
- > AIX asserted in psx_timeo(). Reason for the assert was that
- > the current time was behind psx_ctime. Since this state
- > can occur when the current time is changed after a character
- > is received but before the VTIME interbyte timer pops, we
- > should not assert on this.
- >
- > RESPONDER CONCLUSION:
- > Removed the requirement that current time > psx_ctime by
- > adding a new L_ntimersub macro that is used instead of the
- > ntimersub macro in time.h. Also added a test for (current
- > time - psx_ctime) being negative, in that case we do not
- > adjust the new timeout.
- >
- > Reported to Correct a PTF in Error: NO
- > Reported as a Highly pervasive problem: NO
- >
- > PE Apar?: NoPE
- > Hiper Apar?: NoHiper
- > Status: CLOSED PER
- > Component Name: AIX V3 FOR RS/6
- > Version: 320
- > Component ID: 575603001
- > Submitted: 94/05/03
- > Closed: 94/05/05
- > ChangeTeam: TX2527
- >
- > APAR FIXED BY: U431696 U432151 U432844 U432870 U432979
- > U433049 U433081 U433459 U433876 U433906 U434598 U434453
- > U434672 U434737 U435110