ps_pstop(3PROC) 					 Process Control Library Functions					   ps_pstop(3PROC)

NAME

       ps_pstop, ps_pcontinue, ps_lstop, ps_lcontinue, ps_lrolltoaddr, ps_kill - process and LWP control in libthread_db

SYNOPSIS

       #include <proc_service.h>

       ps_err_e ps_pstop(struct ps_prochandle *ph);

       ps_err_e ps_pcontinue(struct ps_prochandle *ph);

       ps_err_e ps_lstop(struct ps_prochandle *ph, lwpid_t lwpid);

       ps_err_e ps_lcontinue(struct ps_prochandle *ph,
	    lwpid_t lwpid);

       ps_err_e ps_lrolltoaddr(struct ps_prochandle *ph,
	    lwpid_t lwpid, psaddr_t go_addr, psaddr_t stop_addr);

       ps_err_e ps_kill(struct ps_prochandle *ph, int signum);

DESCRIPTION

       The ps_pstop() function stops the target process identified by ph, while the ps_pcontinue() function allows it to resume.

       The  libthread_db() function uses ps_pstop() to freeze the target process while it is under inspection. Within the scope of any single call
       from outside libthread_db to a libthread_db routine, libthread_db will call ps_pstop(), at most once. If it does,  it  will  call  ps_pcon-
       tinue() within the scope of the same routine.

       The controlling process may already have stopped the target process when it calls libthread_db. In that case, it is not obligated to resume
       the target process when libthread_db calls ps_pcontinue(). In other words, ps_pstop() is mandatory, while ps_pcontinue() is advisory. After
       ps_pstop(), the target process must be stopped; after ps_pcontinue(), the target process may be running.

       The ps_lstop() and ps_lcontinue() functions stop and resume a single lightweight process (LWP) within the target process ph.

       The  ps_lrolltoaddr() function is used to roll an LWP forward out of a critical section when the process is stopped. It is also used to run
       the libthread_db agent thread on behalf of libthread. The ps_lrolltoaddr() function is always called with the target process stopped,  that
       is, there has been a preceding call to ps_pstop(). The specified LWP must be continued at the address go_addr, or at its current address if
       go_addr is NULL. It should then be stopped when its execution reaches stop_addr. This routine does not return until the LWP has stopped	at
       stop_addr.

       The ps_kill() function directs the signal signum to the target process for which the handle is ph. It has the same semantics as kill(2).

RETURN VALUES

       PS_OK	     The call completed successfully. In the case of ps_pstop(), the target process is stopped.

       PS_BADLID     For ps_lstop(), ps_lcontinue() and ps_lrolltoaddr(); there is no LWP with id lwipd in the target process.

       PS_ERR	     The function did not return successfully.

ATTRIBUTES

       See attributes(5) for description of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       kill(2), libc_db(3LIB), proc_service(3PROC), attributes(5), threads(5)

SunOS 5.11							    22 Mar 2001 						   ps_pstop(3PROC)