2 files changed, 56 insertions, 18 deletions

diff --git a/lib/libc/gen/getpass.3 b/lib/libc/gen/getpass.3
index 34e91cb..f312d42 100644
--- a/lib/libc/gen/getpass.3
+++ b/lib/libc/gen/getpass.3
@@ -86,3 +86,7 @@ will modify the same object.
 The calling process should zero the password as soon as possible to
 avoid leaving the cleartext password visible in the process's address
 space.
+.Pp
+Upon receipt of a SIGTSTP, the input buffer will be flushed, so any
+partially typed password must be retyped when the process
+continues.
diff --git a/lib/libc/gen/getpass.c b/lib/libc/gen/getpass.c
index cf6088a..658f5b6 100644
--- a/lib/libc/gen/getpass.c
+++ b/lib/libc/gen/getpass.c
@@ -43,16 +43,47 @@ static char sccsid[] = "@(#)getpass.c	8.1 (Berkeley) 6/4/93";
 #include <stdio.h>
 #include <unistd.h>
 
+static	struct termios oterm, term;
+static	sig_t ointhandler, oquithandler, otstphandler, oconthandler;
+static	FILE *fp;
+
+static void
+sighandler(int signo)
+{
+	/* restore tty state */
+	(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &oterm);
+
+	/* restore old sig handlers */
+	(void)signal(SIGINT, ointhandler);
+	(void)signal(SIGQUIT, oquithandler);
+	(void)signal(SIGTSTP, otstphandler);
+
+	/* resend us this signal */
+	(void)kill(getpid(), signo);
+}
+
+/* ARGSUSED */
+static void
+sigconthandler(int signo)
+{
+	/* re-install our signal handlers */
+	ointhandler = signal(SIGINT, sighandler);
+	oquithandler = signal(SIGQUIT, sighandler);
+	otstphandler = signal(SIGTSTP, sighandler);
+
+	/* turn off echo again */
+	(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
+}
+
+
 char *
 getpass(prompt)
 	const char *prompt;
 {
-	struct termios term;
 	register int ch;
 	register char *p;
-	FILE *fp, *outfp;
+	FILE *outfp;
 	long omask;
-	int echo;
 	static char buf[_PASSWORD_LEN + 1];
 
 	/*
@@ -63,16 +94,16 @@ getpass(prompt)
 		outfp = stderr;
 		fp = stdin;
 	}
-	/*
-	 * note - blocking signals isn't necessarily the
-	 * right thing, but we leave it for now.
-	 */
-	omask = sigblock(sigmask(SIGTSTP));
-	(void)tcgetattr(fileno(fp), &term);
-	if (echo = (term.c_lflag & ECHO)) {
-		term.c_lflag &= ~ECHO;
-		(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
-	}
+
+	ointhandler = signal(SIGINT, sighandler);
+	oquithandler = signal(SIGQUIT, sighandler);
+	otstphandler = signal(SIGTSTP, sighandler);
+	oconthandler = signal(SIGCONT, sigconthandler);
+
+	(void)tcgetattr(fileno(fp), &oterm);
+	term = oterm;
+	term.c_lflag &= ~ECHO;
+	(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
 	(void)fputs(prompt, outfp);
 	rewind(outfp);			/* implied flush */
 	for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';)
@@ -80,11 +111,14 @@ getpass(prompt)
 			*p++ = ch;
 	*p = '\0';
 	(void)write(fileno(outfp), "\n", 1);
-	if (echo) {
-		term.c_lflag |= ECHO;
-		(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
-	}
-	(void)sigsetmask(omask);
+	(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &oterm);
+
+	/* restore old sig handlers */
+	(void)signal(SIGINT, ointhandler);
+	(void)signal(SIGQUIT, oquithandler);
+	(void)signal(SIGTSTP, otstphandler);
+	(void)signal(SIGCONT, oconthandler);
+
 	if (fp != stdin)
 		(void)fclose(fp);
 	return(buf);