1 /*
2 * Copyright 2003-2005, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
3 * Distributed under the terms of the MIT License.
4 */
5
6
7 #include <stdio.h>
8 #include <string.h>
9 #include <unistd.h>
10 #include <termios.h>
11
12 #include <syscalls.h>
13
14
15 /** isatty - is the given file descriptor bound to a terminal device?
16 * a simple call to fetch the terminal control attributes suffices
17 * (only a valid tty device will succeed)
18 */
19
20 int
isatty(int fd)21 isatty(int fd)
22 {
23 struct termios termios;
24
25 return _kern_ioctl(fd, TCGETA, &termios, sizeof(struct termios)) == B_OK;
26 // we don't use tcgetattr() here in order to keep errno unchanged
27 }
28
29
30 /** returns the name of the controlling terminal */
31
32 char *
ctermid(char * s)33 ctermid(char *s)
34 {
35 static char defaultBuffer[L_ctermid];
36 char *name = ttyname(STDOUT_FILENO);
37 // we assume that stdout is our controlling terminal...
38
39 if (s == NULL)
40 s = defaultBuffer;
41
42 return strcpy(s, name ? name : "");
43 }
44
45
46 int
tcsetpgrp(int fd,pid_t pgrpid)47 tcsetpgrp(int fd, pid_t pgrpid)
48 {
49 return ioctl(fd, TIOCSPGRP, &pgrpid);
50 }
51
52
53 pid_t
tcgetpgrp(int fd)54 tcgetpgrp(int fd)
55 {
56 pid_t foregroundProcess;
57 int status = ioctl(fd, TIOCGPGRP, &foregroundProcess);
58 if (status == 0)
59 return foregroundProcess;
60
61 return -1;
62 }
63