getcontext man page on HP-UX

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getcontext(2)							 getcontext(2)

       getcontext(), setcontext() - get and  set  current  user context



       The function initializes the structure pointed to by ucp to the current
       user context of the calling  process.  The  ucontext_t  type  that  ucp
       points  to  defines  the	 user context and includes the contents of the
       calling process' machine registers, the signal mask,  and  the  current
       execution stack.

       The function restores the user context pointed to by ucp.  A successful
       call to does not return; program execution resumes at the point	speci‐
       fied  by	 the ucp argument passed to The ucp argument should be created
       either by a prior call to or by being passed as an argument to a signal
       handler.	  If  the ucp argument was created with program execution con‐
       tinues as if the corresponding call of had just returned.  If  the  ucp
       argument was created with program execution continues with the function
       passed to When that function returns, the process continues as if after
       a  call	to with the ucp argument that was input to If the ucp argument
       was passed to a signal handler, program execution  continues  with  the
       program	instruction  following the instruction interrupted by the sig‐
       nal. If the uc_link member of the structure pointed to by the ucp argu‐
       ment  is	 equal	to  0,	then this context is the main context, and the
       process will exit when this context returns. The effects of  passing  a
       ucp argument obtained from any other source are unspecified.

       On  successful  completion, does not return and returns 0. Otherwise, a
       value of −1 is returned.

       and are deprecated and should be used only by legacy applications.

       Context APIs are not recommended due to possible compatibility problems
       from  release  to  release, because context APIs are very architecture-
       specific.  The context APIs "expose" the architecture to	 the  applica‐
       tion,  such  that  the  application  may	 not  be  compatible  with all

       If you must use context APIs, be aware of the following:

       ·  Do not copy the context yourself.  It is not contiguous.   The  con‐
	  text	may  have pointers that may point back to the original context
	  rather than in the copied context; hence, it will be broken.

       ·  The size of the context will vary in length from release to release.

       No errors are defined.

       When a signal handler is executed, the current user  context  is	 saved
       and  a new context is created. If the process leaves the signal handler
       via then it is unspecified whether the context at the time of the  cor‐
       responding  call is restored and thus whether future calls to will pro‐
       vide an accurate representation of the  current context, since the con‐
       text  restored  by  may	not contain all the information that requires.
       Signal handlers should use or instead.

       Portable applications should not modify or access the uc_mcontext  mem‐
       ber  of	ucontext_t.  A portable application cannot assume that context
       includes any process-wide static data, possibly including Users manipu‐
       lating  contexts	 should	 take  care  to	 handle	 these explicitly when

       makecontext(2),	  sigaction(2),	   sigaltstack(2),     sigprocmask(2),
       setjmp(3C), sigsetjmp(3C), <ucontext.h>.

				  Deprecated			 getcontext(2)

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