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#pragma once
#include <camellia/syscalls.h>
#include <kernel/arch/generic.h>
#include <kernel/handle.h>
#include <kernel/main.h>
#include <kernel/vfs/mount.h>
#include <stdbool.h>
#define HANDLE_MAX 16
enum process_state {
PS_RUNNING,
PS_DEAD, // return message not collected
PS_WAITS4CHILDDEATH,
PS_WAITS4FS,
PS_WAITS4REQUEST,
PS_WAITS4PIPE,
PS_LAST,
};
struct process {
struct pagedir *pages;
struct registers regs;
enum process_state state;
bool noreap;
struct process *sibling;
struct process *child;
struct process *parent;
uint32_t id; // only for debugging, don't expose to userland
// saved value, meaning depends on .state
union {
int death_msg; // PS_DEAD
struct {
struct vfs_request *req;
} waits4fs; // PS_WAITS4FS
struct {
char __user *buf;
size_t max_len;
struct fs_wait_response __user *res;
} awaited_req; // PS_WAITS4REQUEST
struct {
struct handle *pipe;
char __user *buf;
size_t len;
struct process *next;
} waits4pipe;
};
struct vfs_request *handled_req;
/* vfs_backend controlled (not exclusively) by this process */
struct vfs_backend *controlled;
struct vfs_mount *mount;
struct {
void *buf;
size_t len;
size_t pos;
} execbuf;
struct handle *handles[HANDLE_MAX];
};
extern struct process *process_first;
extern struct process *process_current;
/** Creates the root process. */
struct process *process_seed(struct kmain_info *info);
struct process *process_fork(struct process *parent, int flags);
void process_kill(struct process *proc, int ret);
/** Tries to free a process / collect its return value. */
int process_try2collect(struct process *dead);
void process_free(struct process *);
/** Removes a process from the process tree. */
void process_forget(struct process *);
/** Switches execution to any running process. */
_Noreturn void process_switch_any(void);
/** Used for iterating over all processes */
struct process *process_next(struct process *);
struct process *process_find(enum process_state);
handle_t process_find_free_handle(struct process *proc, handle_t start_at);
struct handle *process_handle_get(struct process *, handle_t);
void process_transition(struct process *, enum process_state);
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