ProcessState GetProcessState(pid_t pid)
{
pstatus_t pstatus;
if (GetProcessPstatus(pid, &pstatus))
{
if ((pstatus.pr_lwp.pr_flags & PR_STOPPED)
&& (pstatus.pr_lwp.pr_why == PR_SIGNALLED))
{
return PROCESS_STATE_STOPPED;
}
else
{
return PROCESS_STATE_RUNNING;
}
}
else
{
return PROCESS_STATE_DOES_NOT_EXIST;
}
}
ProcessState GetProcessState(pid_t pid)
{
/* This is the documented way to check for zombie process, on Solaris 9
* however I couldn't get it to work: Killing a child process and then reading
* /proc/PID/psinfo *before* reaping the dead child, resulted in
* psinfo.pr_nlwp == 1 and psinfo.pr_lwp.pr_lwpid == 1.
*/
#if 0
psinfo_t psinfo;
if (GetProcessPsinfo(pid, &psinfo))
{
if (psinfo.pr_nlwp == 0 &&
psinfo.pr_lwp.pr_lwpid == 0)
{
return PROCESS_STATE_ZOMBIE;
}
else
{
/* Then, we must read the "status" file to get
* pstatus.pr_lwp.pr_flags, because the psinfo.pr_lwp.pr_flag is
* deprecated. */
pstatus_t pstatus;
if (GetProcessPstatus(pid &pstatus))
{
if (pstatus.pr_lwp.pr_flags & PR_STOPPED)
{
return PROCESS_STATE_STOPPED;
}
else
{
return PROCESS_STATE_RUNNING;
}
}
}
}
return PROCESS_STATE_DOES_NOT_EXIST;
#endif
/* HACK WARNING: By experimentation I figured out that on Solaris 9 there
is no clear way to figure out if a process is zombie, but if the
"status" file is not there while the "psinfo" file is, then it's most
probably a zombie. */
pstatus_t pstatus;
bool success = GetProcessPstatus(pid, &pstatus);
if (!success && errno == ENOENT) /* file does not exist */
{
psinfo_t psinfo;
if (GetProcessPsinfo(pid, &psinfo))
{
/* /proc/PID/psinfo exists, /proc/PID/status does not exist */
return PROCESS_STATE_ZOMBIE;
}
else /* Neither status nor psinfo could be opened */
{
return PROCESS_STATE_DOES_NOT_EXIST;
}
}
/* Read the flags from status, since reading it from
psinfo is deprecated. */
if (success)
{
if (pstatus.pr_lwp.pr_flags & PR_STOPPED)
{
return PROCESS_STATE_STOPPED;
}
else
{
return PROCESS_STATE_RUNNING;
}
}
/* If we reach this point it's probably because /proc/PID/status couldn't
* be opened because of EPERM. We can't do anything to that process, so we
* might as well pretend it does not exist. */
return PROCESS_STATE_DOES_NOT_EXIST;
}
