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#pragma once
#include <shared/types.h>
#include <stddef.h>
#define FORK_NOREAP 1
#define FORK_NEWFS 2
#define OPEN_CREATE 1
enum {
// idc about stable syscall numbers just yet
_SYSCALL_EXIT,
_SYSCALL_AWAIT,
_SYSCALL_FORK,
_SYSCALL_OPEN,
_SYSCALL_MOUNT,
_SYSCALL_READ,
_SYSCALL_WRITE,
_SYSCALL_CLOSE,
_SYSCALL_FS_FORK2,
_SYSCALL_FS_WAIT,
_SYSCALL_FS_RESPOND,
_SYSCALL_MEMFLAG,
_SYSCALL_DEBUG_KLOG,
};
int _syscall(int, int, int, int, int);
/** Kills the current process.
* TODO: what happens to the children?
*/
_Noreturn void _syscall_exit(int ret);
/** Waits for a child to exit.
* @return the value the child passed to exit()
*/
int _syscall_await(void);
/** Creates a copy of the current process, and executes it.
* All user memory pages get copied too.
*
* @param flags FORK_NOREAP, FORK_NEWFS
* @param fs_front requires FORK_NEWFS. the front handle to the new fs is put there
*
* @return 0 in the child, a meaningless positive value in the parent.
*/
int _syscall_fork(int flags, handle_t __user *fs_front);
handle_t _syscall_open(const char __user *path, int len, int flags);
int _syscall_mount(handle_t h, const char __user *path, int len);
int _syscall_read(handle_t h, void __user *buf, size_t len, int offset);
int _syscall_write(handle_t h, const void __user *buf, size_t len, int offset);
int _syscall_close(handle_t h);
struct fs_wait_response {
enum vfs_operation op;
size_t len; // how much was put in *buf
size_t capacity; // how much output can be accepted by the caller
int id; // file id (returned by the open handler, passed to other calls)
int offset;
int flags;
};
/** Blocks until an fs request is made.
* @return 0 if everything was successful */
int _syscall_fs_wait(char __user *buf, int max_len, struct fs_wait_response __user *res);
int _syscall_fs_respond(char __user *buf, int ret);
/** Modifies the virtual address space.
*
* If the MEMFLAG_PRESENT flag is present - mark the memory region as allocated.
* Otherwise, free it.
*
* MEMFLAG_FINDFREE tries to find the first free region of length `len`.
*
* @return address of the first affected page (usually == addr)
*/
void __user *_syscall_memflag(void __user *addr, size_t len, int flags);
void _syscall_debug_klog(const void __user *buf, size_t len);
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