1 /* Test of login_tty() function. 2 Copyright (C) 2010-2021 Free Software Foundation, Inc. 3 4 This program is free software: you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 3 of the License, or 7 (at your option) any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 16 17 #include <config.h> 18 19 /* Specification. */ 20 extern int login_tty (int); 21 22 #include <errno.h> 23 #include <pty.h> 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <termios.h> 27 #include <unistd.h> 28 29 int 30 main () /* */ 31 { 32 int master; 33 int slave; 34 35 /* Open a pseudo-terminal, as a master-slave pair. */ 36 { 37 int res = openpty (&master, &slave, NULL, NULL, NULL); 38 if (res != 0) 39 { 40 fprintf (stderr, "openpty returned %d\n", res); 41 return 1; 42 } 43 } 44 45 /* Create a new session and make it the controlling tty of this session. */ 46 { 47 int res = login_tty (slave); 48 if (res < 0) 49 { 50 fprintf (stderr, "login_tty failed\n"); 51 return 1; 52 } 53 } 54 55 /* From here on, we cannot use stderr for error messages any more. 56 If a test fails, just abort. */ 57 58 /* Check that fd = 0, 1, 2 are now open to the controlling terminal for the 59 current process and that it is a session of its own. */ 60 { 61 int fd; 62 for (fd = 0; fd < 3; fd++) 63 if (!(tcgetpgrp (fd) == getpid ())) 64 abort (); 65 for (fd = 0; fd < 3; fd++) 66 { 67 int sid = tcgetsid (fd); 68 if (!(sid == -1 ? errno == ENOSYS : sid == getpid ())) 69 abort (); 70 } 71 } 72 73 return 0; 74 }