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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* Process Control System Calls
*
* Implements: exit, exit_group, getpid, gettid, getppid,
* sched_yield, clone (stub), wait4 (stub),
* set_tid_address, getuid, getgid.
*
* Reference: docs/specs/syscall.md §7.1
*/
#include <lume/types.h>
#include <lume/task.h>
#include <lume/sched.h>
#include <lume/errno.h>
#include <lume/uaccess.h>
#include <lume/wait.h>
/* External: task lifecycle (kernel/task.cc) */
extern void task_exit(int code);
extern void task_destroy(TaskControlBlock* task);
extern int32 task_wait(int32* exit_code);
extern int32 task_fork(arch::TrapFrame* tf);
/* ======================================================================
* sys_exit / sys_exit_group
* ====================================================================== */
int64 sys_exit(uint64 code, uint64, uint64, uint64, uint64, uint64)
{
task_exit(static_cast<int>(code & 0xFF));
__builtin_unreachable();
}
int64 sys_exit_group(uint64 code, uint64, uint64, uint64, uint64, uint64)
{
/* Phase 2: single-threaded, equivalent to sys_exit.
* Phase 3: kill all threads in tgid then exit. */
task_exit(static_cast<int>(code & 0xFF));
__builtin_unreachable();
}
/* ======================================================================
* sys_getpid / sys_gettid / sys_getppid
* ====================================================================== */
int64 sys_getpid(uint64, uint64, uint64, uint64, uint64, uint64)
{
return current_task()->tgid; /* Linux: getpid() returns tgid */
}
int64 sys_gettid(uint64, uint64, uint64, uint64, uint64, uint64)
{
return current_task()->pid; /* Linux: gettid() returns real tid */
}
int64 sys_getppid(uint64, uint64, uint64, uint64, uint64, uint64)
{
TaskControlBlock* parent = current_task()->parent;
return parent ? parent->tgid : 0;
}
/* ======================================================================
* sys_sched_yield
* ====================================================================== */
int64 sys_sched_yield_wrapper(uint64, uint64, uint64, uint64, uint64, uint64)
{
sched_yield();
return 0;
}
int64 sys_clone_wrapper(uint64 flags, uint64 child_stack,
uint64 ptid, uint64 ctid, uint64 tls, uint64)
{
/* Phase A: Simple fork() support.
* Ignore flags/stack for now and just clone the current task. */
(void)flags; (void)child_stack; (void)ptid; (void)ctid; (void)tls;
arch::TrapFrame* tf = current_task()->trapframe;
if (!tf) return -EINVAL;
return task_fork(tf);
}
/* ========================================================================
* sys_wait4 — Wait for child to exit
* ======================================================================== */
int64 sys_wait4_wrapper(uint64 pid, uint64 wstatus_ptr,
uint64 options, uint64, uint64, uint64)
{
/* Phase A: Basic wait() support.
* TODO: Implement pid-specific wait and WNOHANG in task_wait. */
(void)pid; (void)options;
int32 exit_code = 0;
int32 child_pid = task_wait(&exit_code);
if (child_pid < 0) return child_pid;
if (wstatus_ptr != 0) {
int wstatus = 0;
if (exit_code & kExitCodeSignalFlag) {
wstatus = exit_code & 0x7F;
} else {
wstatus = W_EXITCODE(exit_code);
}
if (copy_to_user(wstatus_ptr, &wstatus, sizeof(int)) < 0)
return -EFAULT;
}
return child_pid;
}
/* ======================================================================
* sys_set_tid_address — musl libc calls this very early
* ====================================================================== */
int64 sys_set_tid_address(uint64 tidptr, uint64, uint64,
uint64, uint64, uint64)
{
/* Phase 2: store the clear_child_tid pointer (needed for futex wakeup).
* For now just return current tid. */
(void)tidptr;
return current_task()->pid;
}
/* ======================================================================
* sys_getuid / sys_getgid — Phase 2: always root
* ====================================================================== */
int64 sys_getuid(uint64, uint64, uint64, uint64, uint64, uint64)
{
return 0; /* root */
}
int64 sys_getgid(uint64, uint64, uint64, uint64, uint64, uint64)
{
return 0; /* root */
}
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