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do_wait: delegate process status for ppid_parent if child process is teacee

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refs #946
This commit is contained in:
Tomoki Shirasawa
2017-09-29 14:59:34 +09:00
parent f8ef43c77d
commit 665eead78b
1 changed files with 88 additions and 37 deletions
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125
kernel/syscall.c
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@ -604,6 +604,48 @@ set_process_rusage(struct process *proc, struct rusage *usage)
usage->ru_maxrss = proc->maxrss / 1024;
}
static void
finalize_process(struct process *proc)
{
struct resource_set *resource_set = cpu_local_var(resource_set);
struct process *pid1 = resource_set->pid1;
int exit_status = proc->exit_status;
// Send signal to parent
if (proc->parent == pid1) {
proc->status = PS_ZOMBIE;
release_process(proc);
}
else {
proc->status = PS_ZOMBIE;
dkprintf("terminate,wakeup\n");
/* Signal parent if still attached */
if (proc->termsig != 0) {
struct siginfo info;
int error;
memset(&info, '\0', sizeof info);
info.si_signo = SIGCHLD;
info.si_code = (exit_status & 0x7f)?
((exit_status & 0x80)?
CLD_DUMPED: CLD_KILLED): CLD_EXITED;
info._sifields._sigchld.si_pid = proc->pid;
info._sifields._sigchld.si_status = exit_status;
info._sifields._sigchld.si_utime =
timespec_to_jiffy(&proc->utime);
info._sifields._sigchld.si_stime =
timespec_to_jiffy(&proc->stime);
error = do_kill(NULL, proc->parent->pid, -1, SIGCHLD, &info, 0);
dkprintf("terminate,klll %d,error=%d\n",
proc->termsig, error);
}
/* Wake parent (if sleeping in wait4()) */
waitq_wakeup(&proc->parent->waitpid_q);
}
}
/*
* From glibc: INLINE_SYSCALL (wait4, 4, pid, stat_loc, options, NULL);
*/
@ -662,6 +704,13 @@ do_wait(int pid, int *status, int options, void *rusage)
if((options & WEXITED) &&
child->status == PS_ZOMBIE) {
int org_options = options;
if ((child->ptrace & PT_TRACED) &&
child->parent != child->ppid_parent) {
options |= WNOWAIT;
}
ret = wait_zombie(thread, child, status, options);
if(!(options & WNOWAIT)){
struct mcs_rwlock_node updatelock;
@ -699,6 +748,25 @@ do_wait(int pid, int *status, int options, void *rusage)
}
else
mcs_rwlock_writer_unlock_noirq(&proc->children_lock, &lock);
if (!(org_options & WNOWAIT) &&
(options & WNOWAIT)) {
struct process *parent;
child->ptrace = 0;
parent = child->ppid_parent;
mcs_rwlock_writer_lock_noirq(&proc->children_lock, &lock);
list_del(&child->siblings_list);
mcs_rwlock_writer_unlock_noirq(&proc->children_lock, &lock);
mcs_rwlock_writer_lock_noirq(&parent->children_lock, &lock);
list_del(&child->ptraced_siblings_list);
list_add_tail(&child->siblings_list, &parent->children_list);
child->parent = parent;
mcs_rwlock_writer_unlock_noirq(&parent->children_lock, &lock);
finalize_process(child);
}
goto out_found;
}
@ -750,8 +818,22 @@ do_wait(int pid, int *status, int options, void *rusage)
}
if (empty) {
ret = -ECHILD;
goto out_notfound;
list_for_each_entry_safe(child, next,
&proc->ptraced_children_list,
ptraced_siblings_list) {
if ((pid < 0 && -pid == child->pgid) ||
pid == -1 ||
(pid == 0 && pgid == child->pgid) ||
(pid > 0 && pid == child->pid) ||
c_thread != NULL) {
empty = 0;
break;
}
}
if (empty) {
ret = -ECHILD;
goto out_notfound;
}
}
/* Don't sleep if WNOHANG requested */
@ -1009,7 +1091,8 @@ void terminate(int rc, int sig)
ids = NULL;
}
if (!list_empty(&proc->children_list)) {
if (!list_empty(&proc->children_list) ||
!list_empty(&proc->ptraced_children_list)) {
// clean up children
for (i = 0; i < HASH_SIZE; i++) {
mcs_rwlock_writer_lock(&resource_set->process_hash->lock[i],
@ -1080,40 +1163,8 @@ void terminate(int rc, int sig)
#endif /* POSTK_DEBUG_TEMP_FIX_48 */
}
// Send signal to parent
if (proc->parent == pid1) {
proc->status = PS_ZOMBIE;
release_process(proc);
}
else {
proc->status = PS_ZOMBIE;
proc->exit_status = exit_status;
dkprintf("terminate,wakeup\n");
/* Signal parent if still attached */
if (proc->termsig != 0) {
struct siginfo info;
int error;
memset(&info, '\0', sizeof info);
info.si_signo = SIGCHLD;
info.si_code = (exit_status & 0x7f)?
((exit_status & 0x80)?
CLD_DUMPED: CLD_KILLED): CLD_EXITED;
info._sifields._sigchld.si_pid = proc->pid;
info._sifields._sigchld.si_status = exit_status;
info._sifields._sigchld.si_utime =
timespec_to_jiffy(&proc->utime);
info._sifields._sigchld.si_stime =
timespec_to_jiffy(&proc->stime);
error = do_kill(NULL, proc->parent->pid, -1, SIGCHLD, &info, 0);
dkprintf("terminate,klll %d,error=%d\n",
proc->termsig, error);
}
/* Wake parent (if sleeping in wait4()) */
waitq_wakeup(&proc->parent->waitpid_q);
}
proc->exit_status = exit_status;
finalize_process(proc);
preempt_disable();
mythread->status = PS_EXITED;