gh0s7/mckernel
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Support pid of zero when calling waitpid

Browse Source 
Make waitpid wait any process with the same pgid of the caller when
setting zero to the pid argument.
This commit is contained in:
Masamichi Takagi
2014-09-08 22:40:56 +09:00
parent ac40b96c24
commit b50e205a61
3 changed files with 9 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/syscall.c
View File

@@ -305,6 +305,7 @@ SYSCALL_DECLARE(wait4)
struct process *proc = cpu_local_var(current);
struct fork_tree_node *child, *child_iter;
int pid = (int)ihk_mc_syscall_arg0(ctx);
int pgid = proc->pgid;
int *status = (int *)ihk_mc_syscall_arg1(ctx);
int options = (int)ihk_mc_syscall_arg2(ctx);
int ret;
@@ -326,7 +327,7 @@ rescan:
ihk_mc_spinlock_lock_noirq(&child_iter->lock);
if (pid == -1 || pid == child_iter->pid) {
if (pid == -1 || (pid == 0 && pgid == child_iter->pgid) || pid == child_iter->pid) {
child = child_iter;
break;
}
@@ -1395,6 +1396,7 @@ unsigned long do_fork(int clone_flags, unsigned long newsp,
}
new->ftn->pid = new->pid;
new->ftn->pgid = new->pgid;
if (clone_flags & CLONE_PARENT_SETTID) {
dkprintf("clone_flags & CLONE_PARENT_SETTID: 0x%lX\n",