man/man3proc/ps_pstop.3proc

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 Copyright (c) 2001 Sun Microsystems, Inc. All Rights Reserved
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 PS_PSTOP 3PROC "Mar 22, 2001"
 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_pcontinue() 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)