banan-os/libc/unistd.cpp

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#include <BAN/Assert.h>
#include <errno.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <sys/syscall.h>
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#include <unistd.h>
void _exit(int status)
{
syscall(SYS_EXIT, status);
ASSERT_NOT_REACHED();
}
long syscall(long syscall, ...)
{
va_list args;
va_start(args, syscall);
long ret = -1;
switch (syscall)
{
case SYS_EXIT:
{
int exit_code = va_arg(args, int);
ret = Kernel::syscall(SYS_EXIT, exit_code);
break;
}
case SYS_READ:
{
int fd = va_arg(args, int);
void* buffer = va_arg(args, void*);
size_t offset = va_arg(args, size_t);
size_t bytes = va_arg(args, size_t);
ret = Kernel::syscall(SYS_READ, fd, (uintptr_t)buffer, offset, bytes);
break;
}
case SYS_WRITE:
{
int fd = va_arg(args, int);
const char* string = va_arg(args, const char*);
size_t offset = va_arg(args, size_t);
size_t bytes = va_arg(args, size_t);
ret = Kernel::syscall(SYS_WRITE, fd, (uintptr_t)string, offset, bytes);
break;
}
case SYS_TERMID:
{
char* buffer = va_arg(args, char*);
ret = Kernel::syscall(SYS_TERMID, (uintptr_t)buffer);
break;
}
case SYS_CLOSE:
{
int fd = va_arg(args, int);
ret = Kernel::syscall(SYS_CLOSE, fd);
break;
}
case SYS_OPEN:
{
const char* path = va_arg(args, const char*);
int oflags = va_arg(args, int);
ret = Kernel::syscall(SYS_OPEN, (uintptr_t)path, oflags);
break;
}
case SYS_ALLOC:
{
size_t bytes = va_arg(args, size_t);
ret = Kernel::syscall(SYS_ALLOC, bytes);
break;
}
case SYS_FREE:
{
void* ptr = va_arg(args, void*);
ret = Kernel::syscall(SYS_FREE, (uintptr_t)ptr);
break;
}
case SYS_SEEK:
{
int fd = va_arg(args, int);
off_t offset = va_arg(args, off_t);
int whence = va_arg(args, int);
ret = Kernel::syscall(SYS_SEEK, fd, offset, whence);
break;
}
case SYS_TELL:
{
int fd = va_arg(args, int);
ret = Kernel::syscall(SYS_TELL, fd);
break;
}
default:
puts("LibC: Unhandeled syscall");
ret = -ENOSYS;
break;
}
va_end(args);
if (ret < 0)
{
errno = -ret;
return -1;
}
return ret;
}
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pid_t fork(void)
{
return -1;
}
int execv(const char*, char* const[])
{
return -1;
}
int execve(const char*, char* const[], char* const[])
{
return -1;
}
int execvp(const char*, char* const[])
{
return -1;
}
pid_t getpid(void)
{
return -1;
}