Hi,
According to LKD 2ed, the funciton forget_origianl_parent() is used to
find a father for orphans when their real father is being exit. The
relavent code:
struct task_struct *p, *reaper = father;
struct list_head *list;
if (father->exit_signal != -1)
reaper = prev_thread(reaper);
else
reaper = child_reaper;
if (reaper == father)
reaper = child_reaper;
I wonder what the conditon "father->exit_signal != -1" means. IMO, in
a thread group, the leader's exit_signal is usually equal to SIGCHLD,
while other threads' exit_signal should be -1. If so, the above code
means that when the leader is being exit, another thread in this group
should be the reaper; otherwise, the init process is chosen. Actually,
a more logical seletion is that when the leader is exiting, the init
process is chosen because there is no other threads in this group
usually; otherwise, another thread would be the reaper because
probably the leader exists at least. That is the condition should be
father->exit_signal == -1. Is that so?
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