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Kernel: Distinguish between new and old process groups with equal pgids

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This does not add any behaviour change to the processes, but it ties a
TTY to an active process group via TIOCSPGRP, and returns the TTY to the
kernel when all processes in the process group die.
Also makes the TTY keep a link to the original controlling process' parent (for
SIGCHLD) instead of the process itself.
This commit is contained in:
AnotherTest 2020-08-15 23:43:19 +04:30 • committed by Andreas Kling
parent cf18bff72a
commit 688e54eac7
9 changed files with 176 additions and 23 deletions
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7
Kernel/Process.h
View file

@ -40,6 +40,7 @@
#include <Kernel/FileSystem/InodeMetadata.h>
#include <Kernel/Forward.h>
#include <Kernel/Lock.h>
#include <Kernel/ProcessGroup.h>
#include <Kernel/StdLib.h>
#include <Kernel/Thread.h>
#include <Kernel/UnixTypes.h>
@ -159,8 +160,8 @@ public:
ProcessID pid() const { return m_pid; }
SessionID sid() const { return m_sid; }
bool is_session_leader() const { return m_sid.value() == m_pid.value(); }
ProcessGroupID pgid() const { return m_pgid; }
bool is_group_leader() const { return m_pgid.value() == m_pid.value(); }
ProcessGroupID pgid() const { return m_pg ? m_pg->pgid() : 0; }
bool is_group_leader() const { return pgid().value() == m_pid.value(); }
const FixedArray<gid_t>& extra_gids() const { return m_extra_gids; }
uid_t euid() const { return m_euid; }
gid_t egid() const { return m_egid; }
@ -620,7 +621,7 @@ private:
ProcessID m_pid { 0 };
SessionID m_sid { 0 };
ProcessGroupID m_pgid { 0 };
RefPtr<ProcessGroup> m_pg;
uid_t m_euid { 0 };
gid_t m_egid { 0 };