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90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
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/*************************************************************************\
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* Copyright (C) Michael Kerrisk, 2018. *
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* *
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* This program is free software. You may use, modify, and redistribute it *
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* under the terms of the GNU Lesser General Public License as published *
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* by the Free Software Foundation, either version 3 or (at your option) *
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* any later version. This program is distributed without any warranty. *
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* See the files COPYING.lgpl-v3 and COPYING.gpl-v3 for details. *
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\*************************************************************************/
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/* Listing 62-3 */
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/* tty_functions.c
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Implement ttySetCbreak() and ttySetRaw().
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*/
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#include <termios.h>
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#include <unistd.h>
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#include "tty_functions.h" /* Declares functions defined here */
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/* Place terminal referred to by 'fd' in cbreak mode (noncanonical mode
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with echoing turned off). This function assumes that the terminal is
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currently in cooked mode (i.e., we shouldn't call it if the terminal
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is currently in raw mode, since it does not undo all of the changes
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made by the ttySetRaw() function below). Return 0 on success, or -1
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on error. If 'prevTermios' is non-NULL, then use the buffer to which
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it points to return the previous terminal settings. */
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int
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ttySetCbreak(int fd, struct termios *prevTermios)
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{
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struct termios t;
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if (tcgetattr(fd, &t) == -1)
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return -1;
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if (prevTermios != NULL)
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*prevTermios = t;
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t.c_lflag &= ~(ICANON | ECHO);
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t.c_lflag |= ISIG;
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t.c_iflag &= ~ICRNL;
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t.c_cc[VMIN] = 1; /* Character-at-a-time input */
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t.c_cc[VTIME] = 0; /* with blocking */
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if (tcsetattr(fd, TCSAFLUSH, &t) == -1)
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return -1;
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return 0;
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}
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/* Place terminal referred to by 'fd' in raw mode (noncanonical mode
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with all input and output processing disabled). Return 0 on success,
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or -1 on error. If 'prevTermios' is non-NULL, then use the buffer to
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which it points to return the previous terminal settings. */
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int
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ttySetRaw(int fd, struct termios *prevTermios)
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{
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struct termios t;
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if (tcgetattr(fd, &t) == -1)
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return -1;
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if (prevTermios != NULL)
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*prevTermios = t;
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t.c_lflag &= ~(ICANON | ISIG | IEXTEN | ECHO);
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/* Noncanonical mode, disable signals, extended
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input processing, and echoing */
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t.c_iflag &= ~(BRKINT | ICRNL | IGNBRK | IGNCR | INLCR |
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INPCK | ISTRIP | IXON | PARMRK);
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/* Disable special handling of CR, NL, and BREAK.
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No 8th-bit stripping or parity error handling.
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Disable START/STOP output flow control. */
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t.c_oflag &= ~OPOST; /* Disable all output processing */
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t.c_cc[VMIN] = 1; /* Character-at-a-time input */
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t.c_cc[VTIME] = 0; /* with blocking */
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if (tcsetattr(fd, TCSAFLUSH, &t) == -1)
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return -1;
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return 0;
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}
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