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support waitid

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send SIGCHLD to parent when SIGSTOP or SIGCONT received

refs #425
refs #283
This commit is contained in:
Tomoki Shirasawa
2015-02-22 20:05:30 +09:00
parent 3d426ada01
commit d9cf1d49b1
4 changed files with 173 additions and 50 deletions
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110
kernel/syscall.c
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@ -97,6 +97,7 @@ static char *syscall_name[] MCKERNEL_UNUSED = {
void check_signal(unsigned long rc, void *regs);
void do_signal(long rc, void *regs, struct process *proc, struct sig_pending *pending);
extern unsigned long do_kill(int pid, int tid, int sig, struct siginfo *info, int ptracecont);
extern struct sigpending *hassigpending(struct process *proc);
int copy_from_user(struct process *, void *, const void *, size_t);
int copy_to_user(struct process *, void *, const void *, size_t);
void do_setpgid(int, int);
@ -383,26 +384,20 @@ static int wait_continued(struct process *proc, struct fork_tree_node *child, in
/*
* From glibc: INLINE_SYSCALL (wait4, 4, pid, stat_loc, options, NULL);
*/
SYSCALL_DECLARE(wait4)
static int
do_wait(int pid, int *status, int options, void *rusage, ihk_mc_user_context_t *ctx)
{
struct process *proc = cpu_local_var(current);
struct fork_tree_node *child_iter, *next;
int pid = (int)ihk_mc_syscall_arg0(ctx);
int pgid = proc->ftn->pgid;
int *status = (int *)ihk_mc_syscall_arg1(ctx);
int options = (int)ihk_mc_syscall_arg2(ctx);
int ret;
struct waitq_entry waitpid_wqe;
int empty = 1;
int orgpid = pid;
dkprintf("wait4,proc->pid=%d,pid=%d\n", proc->ftn->pid, pid);
if (options & ~(WNOHANG | WUNTRACED | WCONTINUED | __WCLONE)) {
dkprintf("wait4: unexpected options(%x).\n", options);
ret = -EINVAL;
goto exit;
}
rescan:
pid = (int)ihk_mc_syscall_arg0(ctx);
pid = orgpid;
ihk_mc_spinlock_lock_noirq(&proc->ftn->lock);
list_for_each_entry_safe(child_iter, next, &proc->ftn->children, siblings_list) {
@ -420,11 +415,14 @@ SYSCALL_DECLARE(wait4)
empty = 0;
if(child_iter->status == PS_ZOMBIE) {
if((options & WEXITED) &&
child_iter->status == PS_ZOMBIE) {
ret = wait_zombie(proc, child_iter, status, ctx);
if(ret) {
list_del(&child_iter->siblings_list);
release_fork_tree_node(child_iter);
if(!(options & WNOWAIT)){
list_del(&child_iter->siblings_list);
release_fork_tree_node(child_iter);
}
goto out_found;
}
}
@ -434,6 +432,9 @@ SYSCALL_DECLARE(wait4)
/* Not ptraced and in stopped state and WUNTRACED is specified */
ret = wait_stopped(proc, child_iter, status, options);
if(ret) {
if(!(options & WNOWAIT)){
child_iter->signal_flags &= ~SIGNAL_STOP_STOPPED;
}
goto out_found;
}
}
@ -442,6 +443,9 @@ SYSCALL_DECLARE(wait4)
(options & WCONTINUED)) {
ret = wait_continued(proc, child_iter, status, options);
if(ret) {
if(!(options & WNOWAIT)){
child_iter->signal_flags &= ~SIGNAL_STOP_CONTINUED;
}
goto out_found;
}
}
@ -464,11 +468,14 @@ SYSCALL_DECLARE(wait4)
empty = 0;
if(child_iter->status == PS_ZOMBIE) {
if((options & WEXITED) &&
child_iter->status == PS_ZOMBIE) {
ret = wait_zombie(proc, child_iter, status, ctx);
if(ret) {
list_del(&child_iter->ptrace_siblings_list);
release_fork_tree_node(child_iter);
if(!(options & WNOWAIT)){
list_del(&child_iter->ptrace_siblings_list);
release_fork_tree_node(child_iter);
}
goto out_found;
}
}
@ -477,6 +484,9 @@ SYSCALL_DECLARE(wait4)
/* ptraced and in stopped or trace-stopped state */
ret = wait_stopped(proc, child_iter, status, options);
if(ret) {
if(!(options & WNOWAIT)){
child_iter->signal_flags &= ~SIGNAL_STOP_STOPPED;
}
goto out_found;
}
} else {
@ -487,6 +497,9 @@ SYSCALL_DECLARE(wait4)
(options & WCONTINUED)) {
ret = wait_continued(proc, child_iter, status, options);
if(ret) {
if(!(options & WNOWAIT)){
child_iter->signal_flags &= ~SIGNAL_STOP_CONTINUED;
}
goto out_found;
}
}
@ -513,6 +526,11 @@ SYSCALL_DECLARE(wait4)
waitq_prepare_to_wait(&proc->ftn->waitpid_q, &waitpid_wqe, PS_INTERRUPTIBLE);
ihk_mc_spinlock_unlock_noirq(&proc->ftn->lock);
if(hassigpending(proc)){
waitq_finish_wait(&proc->ftn->waitpid_q, &waitpid_wqe);
return -EINTR;
}
schedule();
dkprintf("wait4(): woken up\n");
@ -532,6 +550,66 @@ SYSCALL_DECLARE(wait4)
goto exit;
}
SYSCALL_DECLARE(wait4)
{
int pid = (int)ihk_mc_syscall_arg0(ctx);
int *status = (int *)ihk_mc_syscall_arg1(ctx);
int options = (int)ihk_mc_syscall_arg2(ctx);
void *rusage = (void *)ihk_mc_syscall_arg3(ctx);
if(options & ~(WNOHANG | WUNTRACED | WCONTINUED | __WCLONE)){
dkprintf("wait4: unexpected options(%x).\n", options);
return -EINVAL;
}
return do_wait(pid, status, WEXITED | options, rusage, ctx);
}
SYSCALL_DECLARE(waitid)
{
int idtype = (int)ihk_mc_syscall_arg0(ctx);
int id = (int)ihk_mc_syscall_arg1(ctx);
siginfo_t *info = (siginfo_t *)ihk_mc_syscall_arg2(ctx);
int options = (int)ihk_mc_syscall_arg3(ctx);
int pid;
int status;
int rc;
if(idtype == P_PID)
pid = id;
else if(idtype == P_PGID)
pid = -id;
else if(idtype == P_ALL)
pid = -1;
else
return -EINVAL;
if(options & ~(WEXITED | WSTOPPED | WCONTINUED | WNOHANG | WNOWAIT | __WCLONE)){
dkprintf("waitid: unexpected options(%x).\n", options);
return -EINVAL;
}
if(!(options & (WEXITED | WSTOPPED | WCONTINUED))){
dkprintf("waitid: no waiting status(%x).\n", options);
return -EINVAL;
}
rc = do_wait(pid, &status, options, NULL, ctx);
if(rc < 0)
return rc;
if(rc && info){
memset(info, '\0', sizeof(siginfo_t));
info->si_signo = SIGCHLD;
info->_sifields._sigchld.si_pid = rc;
info->_sifields._sigchld.si_status = status;
if((status & 0x000000ff) == 0x0000007f)
info->si_code = CLD_STOPPED;
else if((status & 0x0000ffff) == 0x0000ffff)
info->si_code = CLD_CONTINUED;
else if(status & 0x000000ff)
info->si_code = CLD_KILLED;
else
info->si_code = CLD_EXITED;
}
return 0;
}
static int ptrace_terminate_tracer(struct process *proc, struct fork_tree_node *tracer);
void