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(-)uac.1 (-10 / +11 lines)
Lines 35-49 Link Here
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.Op Fl fprs
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.Op Fl fprs
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.Sh DESCRIPTION
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.Sh DESCRIPTION
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.Nm
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.Nm
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sets the per-process handling of "Unaligned Access" events.  Unlike many
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sets the per-process handling of
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other CPU's the DEC Alpha processor cannot access unaligned data.  To work
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.Dq unaligned access
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around this, the Alpha has the ability to fix the UA fault rather than send
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events.
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the faulting process a
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Unlike many other CPUs the DEC Alpha processor cannot access unaligned data.
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To work around this, the Alpha has the ability to fix the UA fault
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rather than send the faulting process a
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.Dv SIGBUS
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.Dv SIGBUS
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signal.
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signal.
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However, doing so does slow down the
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However, doing so does slow down the
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execution of the faulting process.
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execution of the faulting process.
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At boot up, the DEC Alpha CPU defaults to printing
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At bootup, the DEC Alpha CPU defaults to printing
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.Bl -tag -width indent
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.Bl -tag -width indent
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.It pid Ar nnn Pq Ar <progname> Ns Xo
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.It pid Ar nnn Pq Ar <progname> Ns Xo
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.No : unaligned access: Xo
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.No : unaligned access: Xo
Lines 56-65 Link Here
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.Xc
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.Xc
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.Xc
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.Xc
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.El
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.El
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when a UA happens along with fixing it so
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when a UA happens, along with fixing it, so
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the faulting instruction can continue.
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the faulting instruction can continue.
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UA handling settings are inherited by child process.
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UA handling settings are inherited by child process.
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Issued with out any options,
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Issued without any options,
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.Nm
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.Nm
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displays the current UA handling for the parent process.
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displays the current UA handling for the parent process.
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.Pp
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.Pp
Lines 75-83 Link Here
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.It Fl s
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.It Fl s
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Unaligned access errors result in a
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Unaligned access errors result in a
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.Dv SIGBUS
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.Dv SIGBUS
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being delivered to the parent and
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being delivered to the parent and its future descendants.
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its future descendants.  This aid in pin pointing the faulting access so it
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This aids in pinpointing the faulting access so it can be debugged.
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debugged.
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.El
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.El
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.Sh DIAGNOSTICS
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.Sh DIAGNOSTICS
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Exit status is 0 on success, and 1 if the command
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Exit status is 0 on success, and 1 if the command

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