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Merge pull request 'user_thread' (#9) from user_thread into master

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Reviewed-on: #9
This commit is contained in:
mathieu 2024-02-28 20:24:12 +01:00
commit 86a0138d9c
22 changed files with 399 additions and 67 deletions
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9
Makefile
View File

@ -3,7 +3,7 @@ CPPFLAGS = -MMD
AS=nasm
ASFLAGS += -f elf32
LDFLAGS += -m elf_i386
CFLAGS += -m32 -Wall -Wextra -Werror -ffreestanding -fno-exceptions -fno-pie -fno-stack-protector -fno-tree-vectorize -D__KERNEL__
CFLAGS += -m32 -pipe -Wall -Wextra -Werror -ffreestanding -fno-exceptions -fno-pie -fno-stack-protector -fno-tree-vectorize -D__KERNEL__
#keep .i and .s
#CFLAGS += -save-temps
#CFLAGS += -fanalyzer -Wno-analyzer-malloc-leak -Wno-analyzer-out-of-bounds
@ -88,11 +88,16 @@ test: clean kernel disk.img
run:kernel disk.img ## Run the OS on qemu
qemu-system-x86_64 -kernel $< -serial stdio $(QEMU_OPT)
debug: CFLAGS += $(DEBUG_FLAGS) ## Run the OS on qemu and attach a debugger to it (may need a clean befor to have the debug symbols)
debug: CFLAGS += $(DEBUG_FLAGS) ## Run the OS on qemu and attach a debugger to it (may need a clean before to have the debug symbols)
debug: CXXFLAGS += $(DEBUG_FLAGS)
debug:kernel kernel.debug disk.img
gdb -q -x debug.gdb
isodebug: CFLAGS += $(DEBUG_FLAGS) ## Same than previous but kernel is loaded by grub. So, for example, we can access the elf debug info
isodebug: CXXFLAGS += $(DEBUG_FLAGS)
isodebug:fd.iso disk.img
gdb -q -x debug.iso.gdb
debug_test: CFLAGS += $(DEBUG_FLAGS) -DRUN_TEST
debug_test: debug

8
arch/x86/exception.c
View File

@ -53,10 +53,12 @@ void print_handler(struct cpu_state *frame, ulong intr)
void pagefault_handler(struct cpu_state *frame, ulong intr)
{
// PAGE_FAULT is a interrupt with an error code (see exception_wrapper.S)
uint32_t error_code = cpu_context_get_EX_err(frame);
struct thread *current = getCurrentThread();
assert(frame == current->cpuState);
if (cpu_context_is_in_user_mode(current->cpuState)) {
assert(frame == current->cpuState); // pagefault in kernel not supported ATM
struct uAddrSpace *as = processGetAddrSpace(current->process);
vaddr_t faultAddr = cpu_context_get_EX_faulting_vaddr(frame);
@ -70,8 +72,6 @@ void pagefault_handler(struct cpu_state *frame, ulong intr)
if (!uAddrSpaceHeapCheckNAlloc(as, faultAddr))
goto release_context;
// PAGE_FAULT is a interrupt with an error code (see exception_wrapper.S)
uint32_t error_code = cpu_context_get_EX_err(frame);
int ret = uAddrSpaceSolvePageFault(as, faultAddr, error_code & 0x2);
if (!ret)

2
core/main.c
View File

@ -46,7 +46,7 @@ void idleThread(void *arg)
#define FILE_MAX_SIZE 64 // In nb of sectors
void loadUserSpace()
{
struct ata_partition *part = ATAGetPartition(1);
struct ata_partition *part = ATAGetPartitionByType(PART_TYPE_LINUX);
if (part == NULL) {
printf("No user partition found\n");

51
core/process.c
View File

@ -5,12 +5,14 @@
#include "list.h"
#include "mmuContext.h"
#include "types.h"
#include "thread.h"
#include "uaddrspace.h"
struct process {
char name[PROCESS_NAME_MAX_LENGTH];
int ref;
int pid;
pid_t pid;
pid_t nextTid;
struct uAddrSpace *addrSpace;
struct thread *thList;
@ -48,6 +50,7 @@ struct process *processCreate(char *name)
disable_IRQs(flags);
new->pid = nextPid++;
new->nextTid = new->pid;
list_add_tail(processList, new);
restore_IRQs(flags);
@ -66,7 +69,7 @@ void processListPrint()
struct thread *th;
int nbTh;
printf("%d %s %d %d\n", proc->pid, proc->name, processCountThread(proc), proc->ref);
printf("%lu %s %d %d\n", proc->pid, proc->name, processCountThread(proc), proc->ref);
list_foreach_named(proc->thList, th, nbTh, prevInProcess, nextInProcess)
{
if (th == cur) {
@ -180,3 +183,47 @@ struct uAddrSpace *processGetAddrSpace(struct process *proc){
int processInitHeap(struct process *proc, uaddr_t lastUserAddr){
return uAddrSpaceSetHeap(proc->addrSpace, lastUserAddr, 0);
}
pid_t processGetId(struct process *proc){
return proc->pid;
}
pid_t processGetNextTid(struct process *proc){
return proc->nextTid++;
}
//Should be called with IRQ disabled
struct thread *processGetThread(struct process *proc, pid_t tid)
{
int count;
struct thread *th;
struct thread *thFound = NULL;
list_foreach_named(proc->thList, th, count, prevInProcess, nextInProcess)
{
if (th->tid == tid) {
thFound = th;
break;
}
}
return thFound;
}
int processJoinThread(struct process *proc, pid_t tid)
{
uint32_t flags;
struct thread *th;
int ret = -1;
disable_IRQs(flags);
th = processGetThread(proc, tid);
if (th && th->wqExit) {
wait(th->wqExit);
ret = 0;
}
restore_IRQs(flags);
return ret;
}

7
core/process.h
View File

@ -1,9 +1,11 @@
#pragma once
#include "thread.h"
#include "types.h"
#define PROCESS_NAME_MAX_LENGTH 32
typedef unsigned long int pid_t;
struct process;
struct thread;
int processSetup();
struct process *processCreate(char *name);
@ -18,3 +20,6 @@ int processRemoveThread(struct thread *th);
struct mmu_context *processGetMMUContext(struct process *th);
struct uAddrSpace *processGetAddrSpace(struct process *proc);
int processInitHeap(struct process *proc, uaddr_t lastUserAddr);
pid_t processGetId(struct process *proc);
pid_t processGetNextTid(struct process *proc);
int processJoinThread(struct process *proc, pid_t tid);

80
core/syscall.c
View File

@ -1,6 +1,8 @@
#include "syscall.h"
#include "kernel.h"
#include "keyboard.h"
#include "klibc.h"
#include "paging.h"
#include "process.h"
#include "stdarg.h"
#include "thread.h"
@ -9,7 +11,6 @@
#include "uaddrspace.h"
#include "zero.h"
int syscallExecute(int syscallId, const struct cpu_state *userCtx)
{
@ -110,6 +111,83 @@ int syscallExecute(int syscallId, const struct cpu_state *userCtx)
ret = uAddrSpaceUnmap(as, uaddr, size);
break;
}
case SYSCALL_ID_NEW_THREAD: {
struct uAddrSpace *as;
thread_id_t threadIdPtr;
thread_id_t threadId;
uaddr_t funcAddr;
uint32_t arg1, arg2;
size_t stackSize;
ret = syscallGet5args(userCtx, (unsigned int *)&threadIdPtr,
(unsigned int *)&funcAddr, (unsigned int *)&arg1,
(unsigned int *)&arg2, (unsigned int *)&stackSize);
if (ret)
break;
if (stackSize <= 0) {
ret = -EINVAL;
break;
}
if (memcpyFromUser((vaddr_t)&threadId, threadIdPtr, sizeof(threadId)) !=
sizeof(threadId)) {
ret = -EFAULT;
break;
}
as = processGetAddrSpace(getCurrentThread()->process);
stackSize = ALIGN(stackSize, PAGE_SIZE);
uaddr_t stackAddr = 0;
ret = zeroMmap(as, &stackAddr, stackSize, PAGING_MEM_READ | PAGING_MEM_WRITE, 0);
if (ret)
break;
struct thread *th = threadCreateUser(NULL, getCurrentThread()->process, funcAddr,
arg1, arg2, stackAddr + stackSize);
if (th == NULL) {
ret = -ENOMEM;
uAddrSpaceUnmap(as, stackAddr, stackSize);
}
threadId = threadGetId(th);
if (memcpyToUser(threadIdPtr, (vaddr_t)&threadId, sizeof(threadId)) !=
sizeof(threadId)) {
ret = -EFAULT;
break;
}
break;
}
case SYSCALL_ID_USLEEP: {
unsigned int sleep;
ret = syscallGet1arg(userCtx, &sleep);
if (ret)
break;
ret = threadUsleep(sleep);
break;
}
case SYSCALL_ID_GETPID: {
ret = processGetId(getCurrentThread()->process);
break;
}
case SYSCALL_ID_GETTID: {
ret = threadGetId(getCurrentThread());
break;
}
case SYSCALL_ID_THREAD_JOIN: {
thread_id_t tid;
ret = syscallGet1arg(userCtx, (unsigned int *)&tid);
if (ret)
break;
ret = processJoinThread(getCurrentThread()->process, tid);
break;
}
default:
printf("Unknon syscall id %d\n", syscallId);
ret = -ENOENT;

5
core/syscall.h
View File

@ -11,6 +11,11 @@
#define SYSCALL_ID_BRK 6
#define SYSCALL_ID_MMAP 7
#define SYSCALL_ID_MUNMAP 8
#define SYSCALL_ID_NEW_THREAD 9
#define SYSCALL_ID_USLEEP 10
#define SYSCALL_ID_GETPID 11
#define SYSCALL_ID_GETTID 12
#define SYSCALL_ID_THREAD_JOIN 13
#ifdef __KERNEL__
int syscallExecute(int syscallId, const struct cpu_state *user_ctx);

39
core/thread.c
View File

@ -12,6 +12,12 @@
static struct thread *currentThread;
static struct thread *threadWithTimeout;
static thread_id_t nextTid; // This is the TID for kernel thread ONLY
pid_t threadGetId(struct thread *th)
{
return th->tid;
}
static void threadPrepareContext(struct thread *th);
@ -84,6 +90,8 @@ struct thread *threadCreate(const char *name, cpu_kstate_function_arg1_t func, v
goto free_mem;
thread->state = READY;
thread->tid = nextTid++;
thread->wqExit = NULL;
uint32_t flags;
disable_IRQs(flags);
list_add_tail(currentThread, thread);
@ -110,6 +118,14 @@ struct thread *threadCreateUser(const char *name, struct process *proc, uaddr_t
}
thread->stackSize = THREAD_DEFAULT_STACK_SIZE;
thread->wqExit = (struct wait_queue * )malloc(sizeof(struct wait_queue));
if (!thread->wqExit) {
free((void *)thread->stackAddr);
free(thread);
return NULL;
}
waitQueueInit(thread->wqExit);
if (name)
strzcpy(thread->name, name, THREAD_NAME_MAX_LENGTH);
else
@ -124,6 +140,7 @@ struct thread *threadCreateUser(const char *name, struct process *proc, uaddr_t
goto free_mem;
thread->state = READY;
thread->tid = processGetNextTid(proc);
uint32_t flags;
disable_IRQs(flags);
list_add_tail(currentThread, thread);
@ -143,9 +160,14 @@ void threadDelete(struct thread *thread)
restore_IRQs(flags);
assert(thread->state == EXITING);
if (thread->squattedContext) {
threadChangeCurrentContext(NULL);
if (thread->wqExit) {
waitUp(thread->wqExit);
}
if (thread->squattedContext) {
mmuContextUnref(thread->squattedContext);
}
if (thread->process)
processRemoveThread(thread);
@ -292,6 +314,11 @@ int threadYield()
}
int threadMsleep(unsigned long msec)
{
return threadUsleep(msec*1000);
}
int threadUsleep(unsigned long usec)
{
uint32_t flags;
struct thread *next, *current;
@ -299,12 +326,14 @@ int threadMsleep(unsigned long msec)
disable_IRQs(flags);
current = currentThread;
assertmsg(current->state == RUNNING, "thread %s is in state %d for %lu\n", current->name,
current->state, msec);
assertmsg(current->state == RUNNING, "thread %s is in state %d for %lu us\n", current->name,
current->state, usec);
current->state = SLEEPING;
current->sleepHaveTimeouted = 0;
current->jiffiesSleeping = msecs_to_jiffies(msec);
current->jiffiesSleeping = usecs_to_jiffies(usec);
if (!current->jiffiesSleeping) // sleep at least 1 jiffies
current->jiffiesSleeping = 1;
next = threadSelectNext();
assert(next != current);

7
core/thread.h
View File

@ -4,6 +4,7 @@ struct thread;
#include "cpu_context.h"
#include "mem.h"
#include "process.h"
#include "wait.h"
#define THREAD_NAME_MAX_LENGTH 32
#define THREAD_DEFAULT_STACK_SIZE PAGE_SIZE
@ -17,8 +18,11 @@ typedef enum {
EXITING
} thread_state;
typedef unsigned long int thread_id_t;
struct thread {
char name[THREAD_NAME_MAX_LENGTH];
thread_id_t tid;
struct cpu_state *cpuState;
thread_state state;
vaddr_t stackAddr;
@ -32,6 +36,7 @@ struct thread {
// For User thread only
struct thread *nextInProcess, *prevInProcess;
struct process *process;
struct wait_queue *wqExit; // This will be signaled at thread exit (user only)
/**
* Address space currently "squatted" by the thread, or used to be
@ -83,8 +88,10 @@ int threadYield();
int threadWait(struct thread *current, struct thread *next, unsigned long msec);
int threadUnsched(struct thread *th);
int threadMsleep(unsigned long msec);
int threadUsleep(unsigned long usec);
int threadOnJieffiesTick();
struct thread *getCurrentThread();
int threadAddThread(struct thread *th);
int threadChangeCurrentContext(struct mmu_context *ctx);
int threadCount();
thread_id_t threadGetId(struct thread *th);

3
core/uaddrspace.h
View File

@ -1,8 +1,9 @@
#pragma once
#include "mmuContext.h"
#include "process.h"
#include "stddef.h"
#include "stdint.h"
#include "types.h"
#include <stddef.h>
struct uAddrSpace;
struct uAddrVirtualReg;

10
debug.iso.gdb Normal file
View File

@ -0,0 +1,10 @@
add-symbol-file userspace/user
# Thx to add-gnu-debuglink gdb should know that symbols are in kernel.debug.
# And by default, it should be looking at executable.debug
# But we still have to give him the executable he is suppose to debug (See https://sourceware.org/gdb/current/onlinedocs/gdb.html/Separate-Debug-Files.html)
#add-symbol-file kernel.debug
file kernel
source custom_gdb_extension.py
#For ASM sources
directory arch/x86/:core
target remote | qemu-system-i386 -S -gdb stdio -m 16M -serial file:serialOut -hda fd.iso -hdb disk.img

13
drivers/ata.c
View File

@ -521,6 +521,19 @@ struct ata_partition *ATAGetPartition(int id)
return NULL;
}
struct ata_partition *ATAGetPartitionByType(uint type)
{
struct ata_partition *part;
int count;
list_foreach(partitions, part, count)
{
if (part->type == type)
return part;
}
return NULL;
}
struct ata_partition *ATAPartitionCreate(uint type, uint size, uint32_t lba,
struct ata_device *dev)
{

1
drivers/ata.h
View File

@ -104,5 +104,6 @@ int ATAReadPartitionSector(struct ata_partition *part, int offset, uint nbSector
int ATAReadSector(struct ata_device *dev, int lba, uint nbSector, void *buf);
int ATAWriteSector(struct ata_device *dev, int lba, uint nbSector, void *buf);
struct ata_device *ATAGetDevice(int ctlId, int devId);
struct ata_partition *ATAGetPartitionByType(uint type);
int ATAReadPartition(struct ata_device *dev);
struct ata_partition *ATAGetPartition(int id);

1
drivers/zero.c
View File

@ -3,6 +3,7 @@
#include "alloc.h"
#include "kernel.h"
#include "klibc.h"
#include "mem.h"
struct zeroMappedEntry {
int refCnt;

5
userspace/kernel/syscall.h
View File

@ -11,6 +11,11 @@
#define SYSCALL_ID_BRK 6
#define SYSCALL_ID_MMAP 7
#define SYSCALL_ID_MUNMAP 8
#define SYSCALL_ID_NEW_THREAD 9
#define SYSCALL_ID_USLEEP 10
#define SYSCALL_ID_GETPID 11
#define SYSCALL_ID_GETTID 12
#define SYSCALL_ID_THREAD_JOIN 13
#ifdef __KERNEL__
int syscallExecute(int syscallId, const struct cpu_state *user_ctx);

157
userspace/libc.c
View File

@ -5,6 +5,8 @@
#include "swintr.h"
#include "sys/mman.h"
#include "syscall.h"
#include "thread.h"
#include "unistd.h"
int errno = 0;
int memcmp(const void *aptr, const void *bptr, size_t size)
@ -263,8 +265,57 @@ int puts(const char *str)
return ret; \
}
#define PRINT_UINT(name, type) \
int print##name(type integer, char *str, size_t size) \
{ \
char num[sizeof(integer) * 3]; \
int i = 0; \
int c = 0; \
int ret = 0; \
\
do { \
int digit = integer % 10; \
num[i++] = (digit > 0) ? digit : -digit; \
integer = integer / 10; \
} while (integer != 0); \
\
for (i = i - 1; i >= 0; i--) { \
if (str) { \
if (size) { \
str[c++] = num[i] + '0'; \
size--; \
ret++; \
} else { \
return ret; \
} \
} else { \
ret++; \
} \
} \
return ret; \
}
PRINT_INT(Int, int);
PRINT_INT(Int64, long long int);
PRINT_INT(Lint, long int);
PRINT_INT(Llint, long long int);
PRINT_UINT(Uint, unsigned int);
PRINT_UINT(Luint, long unsigned int);
PRINT_UINT(Lluint, long long unsigned int);
#define PRINT_PART(func, type, str, size, c, ret) \
{ \
int s; \
type d = va_arg(ap, type); \
if (str) \
s = func(d, &str[c], size); \
else \
s = func(d, NULL, size); \
\
size -= s; \
c += s; \
ret += s; \
break; \
}
int vsnprintf(char *str, size_t size, const char *format, va_list ap)
{
@ -277,19 +328,8 @@ int vsnprintf(char *str, size_t size, const char *format, va_list ap)
case '%':
switch (format[i + 1]) {
case 'i':
case 'd': {
int s;
int d = va_arg(ap, int);
if (str)
s = printInt(d, &str[c], size);
else
s = printInt(d, NULL, size);
size -= s;
c += s;
ret += s;
break;
}
case 'd': PRINT_PART(printInt, int, str, size, c, ret)
case 'u': PRINT_PART(printUint, uint, str, size, c, ret)
case 'p':
case 'x': {
char val[sizeof(int) * 2];
@ -350,24 +390,15 @@ int vsnprintf(char *str, size_t size, const char *format, va_list ap)
switch (format[i + 2]) {
case 'l':
switch (format[i + 3]) {
case 'd': {
int s;
long long int d = va_arg(ap, long long int);
if (str)
s = printInt64(d, &str[c], size);
else
s = printInt64(d, NULL, size);
size -= s;
c += s;
ret += s;
break;
}
case 'i':
case 'd': PRINT_PART(printLlint, long long int, str, size, c, ret)
case 'u': PRINT_PART(printLluint, long long unsigned int, str, size, c, ret)
case 'p':
case 'x': {
char val[sizeof(long long int) * 2];
unsigned int valIdx = 0;
long long int d = va_arg(ap, long long int);
unsigned long long int d =
va_arg(ap, unsigned long long int);
itoa(d, val, 16);
if (str) {
while (val[valIdx]) {
@ -388,17 +419,28 @@ int vsnprintf(char *str, size_t size, const char *format, va_list ap)
i++;
break;
case 'i':
case 'd': {
int s;
long int d = va_arg(ap, long int);
if (str)
s = printInt64(d, &str[c], size);
else
s = printInt64(d, NULL, size);
size -= s;
c += s;
ret += s;
case 'd': PRINT_PART(printLint, long int, str, size, c, ret)
case 'u':
PRINT_PART(printLuint, long unsigned int, str, size, c, ret)
case 'p':
case 'x': {
char val[sizeof(int) * 2];
unsigned int valIdx = 0;
unsigned long int d = va_arg(ap, unsigned long int);
itoa(d, val, 16);
if (str) {
while (val[valIdx]) {
if (size) {
str[c++] = val[valIdx++];
size--;
ret++;
} else {
return ret;
}
}
} else {
ret += strlen(val);
}
break;
}
}
@ -745,3 +787,40 @@ int munmap(void *addr, size_t len)
return syscall2(SYSCALL_ID_MUNMAP, (unsigned int)addr, len);
}
/* As when a new thread is run, the params are passed by register (See cpu_ustate_init), use
* this function to simplify new thread usage*/
static void thread_runner()
{
register unsigned long int reg_arg1 asm("%eax");
register unsigned long int reg_arg2 asm("%ebx");
start_routine *func = (start_routine *)reg_arg1;
void *arg = (void *)reg_arg2;
func(arg);
_exit(0);
}
int thread_create(pthread_t *thread, start_routine *func, void *arg, size_t stackSize) {
return syscall5(SYSCALL_ID_NEW_THREAD, (unsigned int)thread, (unsigned int)thread_runner, (unsigned int)func,
(unsigned int)arg, stackSize);
}
int thread_join(pthread_t thread, void **retval){
(void)retval;
return syscall1(SYSCALL_ID_THREAD_JOIN, (unsigned int)thread);
}
int usleep(useconds_t usec) {
return syscall1(SYSCALL_ID_USLEEP, (unsigned int)usec);
}
pid_t gettid(void) {
return syscall0(SYSCALL_ID_GETTID);
}
pid_t getpid(void) {
return syscall0(SYSCALL_ID_GETPID);
}

4
userspace/libc.h
View File

@ -4,6 +4,7 @@
#include "stdint.h"
#include "stddef.h"
#include "minmax.h"
#include "unistd.h"
#define islower(c) (('a' <= (c)) && ((c) <= 'z'))
#define isupper(c) (('A' <= (c)) && ((c) <= 'Z'))
@ -63,3 +64,6 @@ void *malloc(size_t size);
void *calloc(size_t nmemb, size_t size);
void *realloc(void *ptr, size_t size);
void free(void *ptr);
pid_t gettid(void);
pid_t getpid(void);

33
userspace/main_user.c
View File

@ -3,7 +3,9 @@
#include "stdarg.h"
#include "stddef.h"
#include "sys/mman.h"
#include "thread.h"
#include "tiny.h"
#include "unistd.h"
int func_help()
{
@ -15,6 +17,7 @@ int func_help()
printf(" tiny: a tiny C-like interpreter\n");
printf(" mmap: test mmap \n");
printf(" munmap: test munmap \n");
printf(" thread: run a user thread\n");
return 0;
}
@ -118,11 +121,28 @@ int func_munmap()
return ret;
}
int main(int argc, char *argv[])
{
static void *print_hello(void *arg) {
(void)arg;
printf("Hello World from thread %lu\n", gettid());
usleep(100);
return NULL;
}
int func_thread() {
pthread_t id;
void *retval;
thread_create(&id, print_hello, NULL, 4096);
thread_join(id, &retval);
return 0;
}
int main(int argc, char *argv[]) {
(void)argc;
(void)argv;
char buf[64];
assert(getpid() == gettid());
printf("Shell starting... type \"help\" for help\n");
while (1) {
printf(">");
@ -145,7 +165,10 @@ int main(int argc, char *argv[])
continue;
}
if (strcmp(buf, "tiny") == 0) {
func_tiny();
pthread_t id;
void *retval;
thread_create(&id, func_tiny, NULL, 4096);
thread_join(id, &retval);
continue;
}
if (strcmp(buf, "mmap") == 0) {
@ -156,6 +179,10 @@ int main(int argc, char *argv[])
func_munmap();
continue;
}
if (strcmp(buf, "thread") == 0) {
func_thread();
continue;
}
}
return 0;
}

8
userspace/thread.h Normal file
View File

@ -0,0 +1,8 @@
#pragma once
#include <stddef.h>
typedef unsigned long int pthread_t;
typedef void *(start_routine)(void *);
int thread_create(pthread_t *thread, start_routine *func, void *arg, size_t stackSize);
/* retval is ignored ATM */
int thread_join(pthread_t thread, void **retval);

3
userspace/tiny.c
View File

@ -282,8 +282,9 @@ void run()
/* Main program. */
int func_tiny()
void * func_tiny(void *args)
{
(void)args;
printf("Enter your program then ESC\n\n");
printf("TinyC grammar\n");
printf("<program> ::= <statement>\n");

2
userspace/tiny.h
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@ -1,4 +1,4 @@
#pragma once
int func_tiny();
void * func_tiny(void *args);

6
userspace/unistd.h Normal file
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@ -0,0 +1,6 @@
#pragma once
typedef unsigned int useconds_t;
int usleep(useconds_t usec);
typedef unsigned long int pid_t;