mirror of
https://github.com/troglobit/finit.git
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Joachim Nilsson
484aa0ba97
On Alpine Linux 3.6 the tcsetattr() calls failed. This turned out to be a deeply rooted issue not limited to just musl libc. The workaround is to call tcsetattr() in several rounds. In particular the modem signals, c_cflag bits, always fail, so we take a bet on Linux having set up the terminals (hope as a strategy) and ignore that problem, for now. Also, use TCSAFLUSH with tcsetattr(), that seems to work better and is what BusyBox stty use. The local CTL() macro is replaced with CTL() from ttydefaults.h, which exists also in musl libc. Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
/* Reset terminal line settings (stty sane)
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*
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* Copyright (c) 2016-2017 Joachim Nilsson <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h> /* _POSIX_VDISABLE */
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#include <sys/ttydefaults.h> /* Not included by default in musl libc */
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#include <termios.h>
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/* B0 means; keep kernel default */
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speed_t stty_parse_speed(char *baud)
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{
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char *ptr;
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size_t i;
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unsigned long val;
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struct { unsigned long val; speed_t speed; } v2s[] = {
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{ 0, B0 },
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{ 50, B50 },
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{ 75, B75 },
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{ 110, B110 },
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{ 134, B134 },
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{ 150, B150 },
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{ 200, B200 },
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{ 300, B300 },
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{ 600, B600 },
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{ 1200, B1200 },
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{ 1800, B1800 },
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{ 2400, B2400 },
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{ 4800, B4800 },
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{ 9600, B9600 },
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{ 19200, B19200 },
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{ 38400, B38400 },
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{ 57600, B57600 },
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{ 115200, B115200 },
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{ 230400, B230400 },
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{ 460800, B460800 },
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{ 500000, B500000 },
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{ 576000, B576000 },
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{ 921600, B921600 },
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{ 1000000, B1000000 },
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{ 1152000, B1152000 },
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{ 1500000, B1500000 },
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{ 2000000, B2000000 },
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{ 2500000, B2500000 },
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{ 3000000, B3000000 },
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{ 3500000, B3500000 },
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{ 4000000, B4000000 },
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};
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if (!baud || !baud[0])
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return B0;
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errno = 0;
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val = strtoul(baud, &ptr, 10);
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if (errno || ptr == baud)
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return B0;
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for (i = 0; i < sizeof(v2s) / sizeof(v2s[0]); i++) {
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if (v2s[i].val == val)
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return v2s[i].speed;
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}
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return B0;
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}
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void stty(int fd, speed_t speed)
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{
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struct termios term;
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tcdrain(fd);
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if (tcgetattr(fd, &term))
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return;
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if (speed != B0) {
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cfsetispeed(&term, speed);
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cfsetospeed(&term, speed);
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tcsetattr(fd, TCSAFLUSH, &term);
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}
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/* Modem specific control flags */
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term.c_cflag &= ~(PARENB|PARODD|CSTOPB|CRTSCTS);
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term.c_cflag |= CS8|HUPCL|CREAD|CLOCAL;
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term.c_line = 0;
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tcsetattr(fd, TCSAFLUSH, &term);
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/* Timeouts, minimum chars and default flags */
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term.c_cc[VTIME] = 0;
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term.c_cc[VMIN] = 1;
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term.c_iflag = ICRNL|IXON|IXOFF;
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term.c_oflag = OPOST|ONLCR;
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term.c_lflag |= ICANON|ISIG|ECHO|ECHOE|ECHOK|ECHOKE;
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tcsetattr(fd, TCSAFLUSH, &term);
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/* Reset special characters to defaults */
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term.c_cc[VINTR] = CINTR;
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term.c_cc[VQUIT] = CQUIT;
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term.c_cc[VEOF] = CEOF;
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term.c_cc[VEOL] = CEOL;
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term.c_cc[VKILL] = CKILL;
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term.c_cc[VERASE] = CERASE;
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tcsetattr(fd, TCSAFLUSH, &term);
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/* Show cursor again, if it was hidden previously */
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write(fd, "\033[?25h", 6);
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/* Enable line wrap, if disabled previously */
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write(fd, "\033[7h", 4);
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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