return retval;
}
-static struct pid *pidfd_get_pid(unsigned int fd)
-{
- struct fd f;
- struct pid *pid;
-
- f = fdget(fd);
- if (!f.file)
- return ERR_PTR(-EBADF);
-
- pid = pidfd_pid(f.file);
- if (!IS_ERR(pid))
- get_pid(pid);
-
- fdput(f);
- return pid;
-}
-
static long kernel_waitid(int which, pid_t upid, struct waitid_info *infop,
int options, struct rusage *ru)
{
struct pid *pid = NULL;
enum pid_type type;
long ret;
+ unsigned int f_flags = 0;
if (options & ~(WNOHANG|WNOWAIT|WEXITED|WSTOPPED|WCONTINUED|
__WNOTHREAD|__WCLONE|__WALL))
if (upid < 0)
return -EINVAL;
- pid = pidfd_get_pid(upid);
+ pid = pidfd_get_pid(upid, &f_flags);
if (IS_ERR(pid))
return PTR_ERR(pid);
+
break;
default:
return -EINVAL;
wo.wo_flags = options;
wo.wo_info = infop;
wo.wo_rusage = ru;
+ if (f_flags & O_NONBLOCK)
+ wo.wo_flags |= WNOHANG;
+
ret = do_wait(&wo);
+ if (!ret && !(options & WNOHANG) && (f_flags & O_NONBLOCK))
+ ret = -EAGAIN;
put_pid(pid);
return ret;