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#ifndef USERPROG_PROCESS_H
#define USERPROG_PROCESS_H
#include "threads/thread.h"
/* In the current implementation, the capacity is fixed to 1024 (PGSIZE/4) */
struct fd_table {
struct file** fds;
int fd_free; /* lowest-index free FD table entry */
int fd_max; /* highest-index used FD table entry */
int fd_cap; /* FD table capacity */
};
struct process {
/* process tree */
tid_t thread_id;
tid_t parent_tid;
struct list_elem parentelem; /* Owned by parent */
/* communication with parent process */
struct semaphore exit_sem;
struct lock exit_lock;
int exit_status;
/* files */
struct file *executable; /* Loaded executable, if any. */
struct fd_table fd_table; /* File descriptor table */
/* Owned by syscall.c */
void* syscall_buffer;
size_t syscall_buffer_page_cnt;
};
void process_init (void);
struct process* process_current (void);
tid_t process_execute (const char *file_name);
int process_wait (tid_t);
void process_exit (void);
void process_activate (void);
int process_open_file(const char* fname);
struct file* process_get_file(int fd);
void process_lock_filesys (void);
void process_unlock_filesys (void);
bool process_close_file(int fd);
#endif /* userprog/process.h */
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