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949aef4aef
This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
131 lines
4.3 KiB
C++
131 lines
4.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/Process.h>
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#include <Kernel/TTY/TTY.h>
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namespace Kernel {
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pid_t Process::sys$getsid(pid_t pid)
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{
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REQUIRE_PROMISE(proc);
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if (pid == 0)
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return m_sid;
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ScopedSpinLock lock(g_processes_lock);
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auto* process = Process::from_pid(pid);
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if (!process)
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return -ESRCH;
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if (m_sid != process->m_sid)
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return -EPERM;
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return process->m_sid;
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}
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pid_t Process::sys$setsid()
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{
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REQUIRE_PROMISE(proc);
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InterruptDisabler disabler;
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bool found_process_with_same_pgid_as_my_pid = false;
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Process::for_each_in_pgrp(pid(), [&](auto&) {
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found_process_with_same_pgid_as_my_pid = true;
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return IterationDecision::Break;
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});
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if (found_process_with_same_pgid_as_my_pid)
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return -EPERM;
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m_sid = m_pid;
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m_pgid = m_pid;
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m_tty = nullptr;
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return m_sid;
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}
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pid_t Process::sys$getpgid(pid_t pid)
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{
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REQUIRE_PROMISE(proc);
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if (pid == 0)
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return m_pgid;
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ScopedSpinLock lock(g_processes_lock); // FIXME: Use a ProcessHandle
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auto* process = Process::from_pid(pid);
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if (!process)
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return -ESRCH;
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return process->m_pgid;
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}
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pid_t Process::sys$getpgrp()
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{
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REQUIRE_PROMISE(stdio);
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return m_pgid;
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}
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static pid_t get_sid_from_pgid(pid_t pgid)
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{
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ScopedSpinLock lock(g_processes_lock);
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auto* group_leader = Process::from_pid(pgid);
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if (!group_leader)
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return -1;
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return group_leader->sid();
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}
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int Process::sys$setpgid(pid_t specified_pid, pid_t specified_pgid)
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{
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REQUIRE_PROMISE(proc);
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ScopedSpinLock lock(g_processes_lock); // FIXME: Use a ProcessHandle
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pid_t pid = specified_pid ? specified_pid : m_pid;
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if (specified_pgid < 0) {
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// The value of the pgid argument is less than 0, or is not a value supported by the implementation.
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return -EINVAL;
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}
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auto* process = Process::from_pid(pid);
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if (!process)
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return -ESRCH;
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if (process != this && process->ppid() != m_pid) {
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// The value of the pid argument does not match the process ID
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// of the calling process or of a child process of the calling process.
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return -ESRCH;
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}
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if (process->pid() == process->sid()) {
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// The process indicated by the pid argument is a session leader.
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return -EPERM;
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}
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if (process->ppid() == m_pid && process->sid() != sid()) {
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// The value of the pid argument matches the process ID of a child
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// process of the calling process and the child process is not in
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// the same session as the calling process.
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return -EPERM;
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}
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pid_t new_pgid = specified_pgid ? specified_pgid : process->m_pid;
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pid_t current_sid = get_sid_from_pgid(process->m_pgid);
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pid_t new_sid = get_sid_from_pgid(new_pgid);
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if (current_sid != new_sid) {
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// Can't move a process between sessions.
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return -EPERM;
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}
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// FIXME: There are more EPERM conditions to check for here..
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process->m_pgid = new_pgid;
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return 0;
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}
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}
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