sigreturn man page on DigitalUNIX

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sigreturn(2)							  sigreturn(2)

NAME
       sigreturn - Return from a signal

SYNOPSIS
       #include <signal.h>

       int sigreturn(
	       struct sigcontext *scp );

PARAMETERS
       Points  to  a  sigcontext structure whose members contain the processor
       state to be restored. The contents of the sigcontext  structure	should
       have  been  previously  obtained by entry to a signal handler or by the
       setjmp() or sigsetjmp() function.

DESCRIPTION
       The sigreturn() function restores the processor state  of  the  calling
       process from a sigcontext structure.  The sigcontext structure contains
       the state of all application-visible registers as well  as  the	signal
       mask.  The  specific  members of the sigcontext structure depend on the
       machine	architecture.  Each  machine-dependent	structure  member   is
       defined in the <signal.h> include file.

       The  sigreturn()	 function is used internally by the system software to
       restore the processor state on return from a signal handler and from  a
       longjmp()  function,  to restore the state saved by a previous setjmp()
       or sigsetjmp() function.

NOTES
       An application should use sigreturn() with great caution.

RETURN VALUES
       Upon successful completion, the sigreturn() function does  not  return.
       Otherwise,  a  value of -1 is returned and errno may be set to indicate
       the error.

ERRORS
       If  the	sigreturn()  function  fails,  the  process  context   remains
       unchanged  and  errno  is  set  to one of the following values: The scp
       parameter points to memory space that  is  not  a  valid	 part  of  the
       process	address	 space.	 The sigcontext structure contains unsupported
       or illegal values.

SEE ALSO
       Functions: sigaction(2), sigvec(2), setjmp(3)

								  sigreturn(2)
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