termios/tcsetattr.c

   1 /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stddef.h>
  20 #include <termios.h>
  21
  22 static int bad_speed (speed_t speed);
  23
  24 /* Set the state of FD to *TERMIOS_P.  */
  25 int
  26 tcsetattr (int fd, int optional_actions, const struct termios *termios_p)
  27 {
  28   if (fd < 0)
  29     {
  30       __set_errno (EBADF);
  31       return -1;
  32     }
  33   if (termios_p == NULL)
  34     {
  35       __set_errno (EINVAL);
  36       return -1;
  37     }
  38   switch (optional_actions)
  39     {
  40     case TCSANOW:
  41     case TCSADRAIN:
  42     case TCSAFLUSH:
  43       break;
  44     default:
  45       __set_errno (EINVAL);
  46       return -1;
  47     }
  48
  49   if (bad_speed(termios_p->__ospeed)
  50       || bad_speed(termios_p->__ispeed == 0
  51                    ? termios_p->__ospeed : termios_p->__ispeed))
  52     {
  53       __set_errno (EINVAL);
  54       return -1;
  55     }
  56
  57   __set_errno (ENOSYS);
  58   return -1;
  59 }
  60 libc_hidden_def (tcsetattr)
  61
  62 /* Strychnine checking.  */
  63 static int
  64 bad_speed (speed_t speed)
  65 {
  66   switch (speed)
  67     {
  68     case B0:
  69     case B50:
  70     case B75:
  71     case B110:
  72     case B134:
  73     case B150:
  74     case B200:
  75     case B300:
  76     case B600:
  77     case B1200:
  78     case B1800:
  79     case B2400:
  80     case B4800:
  81     case B9600:
  82     case B19200:
  83     case B38400:
  84     case B57600:
  85     case B115200:
  86     case B230400:
  87     case B460800:
  88     case B500000:
  89     case B576000:
  90     case B921600:
  91     case B1000000:
  92     case B1152000:
  93     case B1500000:
  94     case B2000000:
  95     case B2500000:
  96     case B3000000:
  97     case B3500000:
  98     case B4000000:
  99       return 0;
 100     default:
 101       return 1;
 102     }
 103 }
 104
 105
 106 stub_warning (tcsetattr)