sigstack(2) — bsd — Apollo Domain/OS SR10.4

SIGSTACK(2)                          BSD                           SIGSTACK(2)



NAME
     sigstack - set and/or get signal stack context

SYNOPSIS
     #include <signal.h>

     struct sigstack {
     caddr_t ss_sp;
     int ss_onstack;
     };

     sigstack(ss, oss);
     struct sigstack *ss, *oss;

DESCRIPTION
     sigstack allows users to define an alternate stack on which signals are
     to be processed. If ss is nonzero, it specifies a "signal stack" on which
     to deliver signals and tells the system if the process is currently
     executing on that stack. When a signal's action indicates its handler
     should execute on the signal stack (specified with a sigvec(2) call), the
     system checks to see if the process is currently executing on that stack.
     If the process is not currently executing on the signal stack, the system
     arranges a switch to the signal stack for the duration of the signal
     handler's execution.  If oss is nonzero, the current signal stack state
     is returned.

     sigvec(2), setjmp(3)

DIAGNOSTICS
     A successful call returns 0.  A failed call returns -1 and sets errno as
     indicated under "Errors."

NOTES
     Signal stacks are not "grown" automatically.  If the stack overflows
     unpredictable results may occur.
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