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Update the current sigaction(2) man page to current reality..

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* sigstack(2) -> sigaltstack(2).
* Document the SA_NODEFER flag
* Document the SA_RESETHAND flag
This commit is contained in:
peter 1996-03-03 14:52:54 +00:00
parent c2ef5cc04f
commit 3fa743054a
1 changed files with 19 additions and 5 deletions
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24
lib/libc/sys/sigaction.2
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@ -50,7 +50,7 @@ struct sigaction {
.Sh DESCRIPTION
The system defines a set of signals that may be delivered to a process.
Signal delivery resembles the occurrence of a hardware interrupt:
the signal is blocked from further occurrence, the current process
the signal is normally blocked from further occurrence, the current process
context is saved, and a new one is built. A process may specify a
.Em handler
to which a signal is delivered, or specify that a signal is to be
@ -68,7 +68,7 @@ of the process. This may be changed, on a per-handler basis,
so that signals are taken on a special
.Em "signal stack" .
.Pp
Signal routines execute with the signal that caused their
Signal routines normally execute with the signal that caused their
invocation
.Em blocked ,
but other signals may yet occur.
@ -131,7 +131,7 @@ If
is non-zero, the previous handling information for the signal
is returned to the user.
.Pp
Once a signal handler is installed, it remains installed
Once a signal handler is installed, it normally remains installed
until another
.Fn sigaction
call is made, or an
@ -178,7 +178,16 @@ bit is set in
the system will deliver the signal to the process on a
.Em "signal stack" ,
specified with
.Xr sigstack 2 .
.Xr sigaltstack 2 .
If the
.Dv SA_NODEFER
bit is set, further occurrences of the delivered signal are not
masked during the execution of the handler.
If the
.Dv SA_RESETHAND
bit is set, the handler is reset back to
.Dv SIG_DFL
at the moment the signal is delivered.
.Pp
If a signal is caught during the system calls listed below,
the call may be forced to terminate
@ -352,6 +361,11 @@ and
Those signals are available on most
.Tn BSD Ns \-derived
systems.
The
.Dv SA_NODEFER
and
.Dv SA_RESETHAND
are intended for backwards compatability with other operating systems.
.Sh SEE ALSO
.Xr kill 1 ,
.Xr ptrace 2 ,
@ -362,7 +376,7 @@ systems.
.Xr sigblock 2 ,
.Xr sigsetmask 2 ,
.Xr sigpause 2 ,
.Xr sigstack 2 ,
.Xr sigaltstack 2 ,
.Xr sigvec 2 ,
.Xr setjmp 3 ,
.Xr siginterrupt 3 ,