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