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@ -65,7 +65,8 @@ struct sigaction {
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The system defines a set of signals that may be delivered to a process.
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Signal delivery resembles the occurrence of a hardware interrupt:
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the signal is normally blocked from further occurrence, the current process
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context is saved, and a new one is built. A process may specify a
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context is saved, and a new one is built.
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A process may specify a
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.Em handler
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to which a signal is delivered, or specify that a signal is to be
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.Em ignored .
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@ -78,7 +79,8 @@ in which case its delivery is postponed until it is
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The action to be taken on delivery is determined at the time
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of delivery.
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Normally, signal handlers execute on the current stack
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of the process. This may be changed, on a per-handler basis,
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of the process.
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This may be changed, on a per-handler basis,
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so that signals are taken on a special
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.Em "signal stack" .
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.Pp
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@ -89,9 +91,10 @@ but other signals may yet occur.
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A global
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.Em "signal mask"
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defines the set of signals currently blocked from delivery
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to a process. The signal mask for a process is initialized
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from that of its parent (normally empty). It
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may be changed with a
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to a process.
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The signal mask for a process is initialized
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from that of its parent (normally empty).
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It may be changed with a
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.Xr sigprocmask 2
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call, or when a signal is delivered to the process.
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.Pp
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@ -114,7 +117,8 @@ system call.
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When a caught signal
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is delivered, the current state of the process is saved,
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a new signal mask is calculated (as described below),
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and the signal handler is invoked. The call to the handler
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and the signal handler is invoked.
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The call to the handler
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is arranged so that if the signal handling routine returns
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normally the process will resume execution in the context
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from before the signal's delivery.
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@ -195,8 +199,8 @@ If this bit is set when calling
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for the
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.Dv SIGCHLD
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signal, the system will not create zombie processes when children of
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the calling process exit. If the calling process subsequently issues
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a
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the calling process exit.
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If the calling process subsequently issues a
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.Xr wait 2
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(or equivalent), it blocks until all of the calling process's child
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processes terminate, and then returns a value of \-1 with
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@ -452,7 +456,8 @@ Extension Interfaces:
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.Fn strlcat .
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.Pp
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All functions not in the above lists are considered to be unsafe
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with respect to signals. That is to say, the behaviour of such
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with respect to signals.
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That is to say, the behaviour of such
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functions when called from a signal handler is undefined.
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In general though, signal handlers should do little more than set a
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flag; most other actions are not safe.
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@ -628,7 +633,8 @@ The
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and
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.Dv SA_RESETHAND
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flags are intended for backwards compatibility with other operating
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systems. The
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systems.
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The
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.Dv SA_NOCLDSTOP ,
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and
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.Dv SA_NOCLDWAIT
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