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From: Mark Newton <newton@FreeBSD.org>
Date: Sat, 15 Jan 2000 07:29:38 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/i386/svr4 svr4_machdep.c
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newton      2000/01/15 07:29:38 PST

  Modified files:
    sys/i386/svr4        svr4_machdep.c 
  Log:
  Pre-freeze cleanups:  Conditionalize debugging writes on DEBUG_SVR4,
  eliminate warnings, etc.
  
  Note that svr4_setcontext() and svr4_getcontext() currently don't work
  correctly, which makes returning from signal handlers somewhat problematic
  (for reference:  the SysVR4 setcontext() and getcontext() syscalls behave
  like a low-level version of setjmp() and longjmp(), in that they save and
  restore process context.  SysVR4 uses this to implement its signal handler
  trampoline:  The context which is saved before a signal handler is called
  is restored by an implicit call to the setcontext() syscall when the signal
  handler returns.  That currently doesn't work right in this emulator,
  although it used to).
  
  I'm committing this anyway, with a caveat that it's buggy, so that I can
  (a) note the bug for anyone who is wondering about it, and (b) get the
  stuff I've done to improve (but not fix) the situation in the tree before
  4.0 is released.  If I have time to fix it totally RSN I'll talk to Jordan
  to see if I can bend him into letting me commit a bugfix :-)
  
  Note that the situation now is somewhat better than it was yesterday
  anyway, because I've fixed the handling of svr4_sigsets which previously
  was causing signal handlers to not get called at all.  Stay tuned for
  an upcoming commit to svr4_signal.c...
  
  Revision  Changes    Path
  1.13      +33 -12    src/sys/i386/svr4/svr4_machdep.c



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