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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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10
Kernel/Syscalls/setpgid.cpp
View file

@ -56,7 +56,7 @@ pid_t Process::sys$setsid()
return -EPERM;
// Create a new Session and a new ProcessGroup.
m_sid = m_pid.value();
m_pgid = m_pid.value();
m_pg = ProcessGroup::create(ProcessGroupID(m_pid.value()));
m_tty = nullptr;
return m_sid.value();
}
@ -65,18 +65,18 @@ pid_t Process::sys$getpgid(pid_t pid)
{
REQUIRE_PROMISE(proc);
if (pid == 0)
return m_pgid.value();
return pgid().value();
ScopedSpinLock lock(g_processes_lock); // FIXME: Use a ProcessHandle
auto process = Process::from_pid(pid);
if (!process)
return -ESRCH;
return process->m_pgid.value();
return process->pgid().value();
}
pid_t Process::sys$getpgrp()
{
REQUIRE_PROMISE(stdio);
return m_pgid.value();
return pgid().value();
}
SessionID Process::get_sid_from_pgid(ProcessGroupID pgid)
@ -134,7 +134,7 @@ int Process::sys$setpgid(pid_t specified_pid, pid_t specified_pgid)
return -EPERM;
}
// FIXME: There are more EPERM conditions to check for here..
process->m_pgid = new_pgid;
process->m_pg = ProcessGroup::find_or_create(new_pgid);
return 0;
}