#include <syscall.h>
#include <types.h>
#include <lib.h>

//per la exit
#include <types.h>
#include <kern/unistd.h>
#include <clock.h>
#include <copyinout.h>
#include <proc.h>
#include <thread.h>
#include <addrspace.h>
// per la wait_proc
#include <synch.h>
#include <current.h>
#include <proc.h>


#include <opt-syscall.h>
#include <opt-pidtable.h>
#if OPT_SYSCALL==1
ssize_t sys_read(int fd, void *buf, size_t count) {
	unsigned int i;
	char* str = (char*) buf;
	if(fd != 0) //standard input
	return 0;
	for(i=0; i<count; i++) {
		str[i] = getch();
		if( str[i] == '\n') {
		str[i+1] = '\0';
		}
	}
	return i+1;
}


ssize_t sys_write(int fd, const void *buf, size_t count) {
	unsigned int i;
	char* str = (char*) buf;
	if(fd != 1) //standard output
	return 0;
	for(i=0; i<count; i++) {
		if( str[i] == '\0') break;
		putch(str[i]);
	}
	return i;
}

void sys__exit(int code) {

	  kprintf("Code returned to system: %d\n", code);

	  //added to work with wait() -> join

	  curproc->lastStatus = code; //salvo lo stato che verrà preso nella wait_pid
	  V(curproc->sem);

	  //
	  /*
	  as_destroy(as);  // libera as
	  */

	  thread_exit();  //esce dal thread

	  panic("thread_exit returned (should not happen)\n");
	  //(void) status; // TODO: status handling

}

#if OPT_PIDTABLE==1
// testata correttamente :: //
int sys_waitpid(pid_t pid) {
	struct proc * p = proc_getproc((int)pid);

	P(p->sem);  //il processo si ferma e aspetta
	int status = p->lastStatus;

	/* get address space of current process and destroy */
	while( p->p_numthreads != 0); //destroy si può fare solo quando numthread è 0
	proc_destroy(p);
	//as_destroy(as);  // libera as: già fatto in proc destroy

	return status;

}

pid_t sys_getpid(void) {
	return proc_getpid();
}

int sys_fork(void) {
	///*
	struct proc* newp = NULL;
	struct addrspace* as = NULL;
	newp = proc_create_runprogram("Test");
	as = proc_getas();

     	if ( newp == NULL) return -1;
	spinlock_acquire(&newp->p_lock);
	newp->p_addrspace = as;
	spinlock_release(&newp->p_lock);

	return (int) newp->pid;
	//*/ return 2;
}

#endif


#endif