#include	<signal.h>#include	<stdio.h>#include	<termios.h>#define	MAX_PASS_LEN	8		/* max #chars for user to enter */char *getpass(const char *prompt){	static char		buf[MAX_PASS_LEN + 1];	/* null byte at end */	char			*ptr;	sigset_t		sig, osig;	struct termios	ts, ots;	FILE			*fp;	int				c;	if ((fp = fopen(ctermid(NULL), "r+")) == NULL)		return(NULL);	setbuf(fp, NULL);	sigemptyset(&sig);	sigaddset(&sig, SIGINT);		/* block SIGINT */	sigaddset(&sig, SIGTSTP);		/* block SIGTSTP */	sigprocmask(SIG_BLOCK, &sig, &osig);	/* and save mask */	tcgetattr(fileno(fp), &ts);		/* save tty state */	ots = ts;						/* structure copy */	ts.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);	tcsetattr(fileno(fp), TCSAFLUSH, &ts);	fputs(prompt, fp);	ptr = buf;	while ((c = getc(fp)) != EOF && c != '\n')		if (ptr < &buf[MAX_PASS_LEN])			*ptr++ = c;	*ptr = 0;			/* null terminate */	putc('\n', fp);		/* we echo a newline */	tcsetattr(fileno(fp), TCSAFLUSH, &ots); /* restore TTY state */	sigprocmask(SIG_SETMASK, &osig, NULL);  /* restore mask */	fclose(fp);			/* done with /dev/tty */	return(buf);}