/*
* terminal_read()
*
* Description:
* Implements read syscall specific to the terminal.
*
* Inputs:
* buf: buf to read the command buffer into
* nbytes: number of bytes to read
*
* Outputs:
* countread: the number of bytes read
*/
int32_t terminal_read(unsigned char * buf, int32_t nbytes) {
int i;
int countread = 0;
set_command_location(get_tty_number());
/* Spin until allow_terminal_read = 1 (we allow it to be read). */
while(!allow_terminal_read[get_tty_number()]);
/* We can only get here if we are the active terminal and the user
* presses ENTER.
*/
new_line();
/* Iterate through nbytes reading (putting) the command buffer into buf. */
for (i = 0; i < nbytes; i++) {
buf[i] = command_buffer[active_terminal][i];
command_buffer[active_terminal][i] = NULL;
countread++;
}
/* Reset command_length, cursor, and the allow_terminal_read lock. */
command_length[active_terminal] = 0;
cursor_x[active_terminal] = 0;
allow_terminal_read[active_terminal] = 0;
return countread;
}
void timeout_handler() {
printf("[-] read() timeout! \n");
if (!get_tty_number())
printf("Try with console ownership: switch to a TTY by using "
"Ctrl-Alt-F[1-6] and try again.\n");
else
printf("Maybe inotify isn't enabled.\n");
_exit(1);
}
/*
* terminal_write()
*
* Description:
* Implements write syscall specific to the terminal. It prints a buffer with
* "putc" and returns the number of bytes (or characters) printed.
*
* Inputs:
* buf: input buffer
* nbytes: number of bytes to print from buffer
*
* Outputs:
* successputs: the number of bytes printed
*/
int32_t terminal_write(const unsigned char * buf, int32_t nbytes)
{
int i;
/* Number of bytes printed begins at zero. */
int successputs = 0;
/* Iteratively print the buf to the screen. */
for (i = 0; i < nbytes; i++) {
/* Print a char from the buffer. */
putc(buf[i], get_tty_number());
/* Increment the number of bytes printed. */
successputs++;
}
/* Return the number of bytes printed. */
return successputs;
}
