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wait4(): support for ECHILD error check

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Balazs Gerofi bgerofi@riken.jp
2014-05-13 10:28:27 +09:00
parent 426c67861c
commit ac65e6c869
1 changed files with 9 additions and 0 deletions
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9
kernel/syscall.c
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@@ -276,6 +276,7 @@ SYSCALL_DECLARE(wait4)
int options = (int)ihk_mc_syscall_arg2(ctx);
int ret;
struct waitq_entry waitpid_wqe;
int empty = 1;
rescan:
child = NULL;
@@ -284,6 +285,9 @@ rescan:
ihk_mc_spinlock_lock_noirq(&proc->ftn->lock);
list_for_each_entry(child_iter, &proc->ftn->children, siblings_list) {
empty = 0;
ihk_mc_spinlock_lock_noirq(&child_iter->lock);
if (child_iter->status == PS_ZOMBIE
@@ -296,6 +300,11 @@ rescan:
ihk_mc_spinlock_unlock_noirq(&child_iter->lock);
}
if (empty) {
ihk_mc_spinlock_unlock_noirq(&proc->ftn->lock);
return ECHILD;
}
if (child) {
struct syscall_request request IHK_DMA_ALIGN;