src/system/libroot/posix/unistd/terminal.c

   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
  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 *
  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
  47 tcsetpgrp(int fd, pid_t pgrpid)
  48 {
  49         return ioctl(fd, TIOCSPGRP, &pgrpid);
  50 }
  51
  52
  53 pid_t
  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 }