mirror of
https://github.com/hsoft/collapseos.git
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103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
#include <stdlib.h>
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#include <unistd.h>
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#include <termios.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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void mread(int fd, char *s, int count)
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{
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while (count) {
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while (read(fd, s, 1) == 0) {
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usleep(1000);
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}
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s++;
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count--;
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}
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}
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void sendcmd(int fd, char *cmd)
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{
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char junk[2];
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while (*cmd) {
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write(fd, cmd, 1);
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read(fd, &junk, 1);
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cmd++;
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// The other side is sometimes much slower than us and if we don't let
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// it breathe, it can choke.
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usleep(1000);
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}
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write(fd, "\r", 1);
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mread(fd, junk, 2); // sends back \r\n
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usleep(1000);
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}
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// Send a cmd and also read the "> " prompt
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void sendcmdp(int fd, char *cmd)
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{
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char junk[2];
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sendcmd(fd, cmd);
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mread(fd, junk, 2);
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}
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// from https://stackoverflow.com/a/6947758
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// discussion from https://stackoverflow.com/a/26006680 is interesting,
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// but we don't want POSIX compliance.
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int set_interface_attribs(int fd, int speed, int parity)
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{
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struct termios tty;
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if (tcgetattr (fd, &tty) != 0) {
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fprintf(stderr, "error %d from tcgetattr", errno);
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return -1;
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}
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if (speed) {
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cfsetospeed (&tty, speed);
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cfsetispeed (&tty, speed);
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}
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tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS8; // 8-bit chars
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// disable IGNBRK for mismatched speed tests; otherwise receive break
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// as \000 chars
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tty.c_iflag &= ~IGNBRK; // disable break processing
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tty.c_lflag = 0; // no signaling chars, no echo,
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// no canonical processing
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tty.c_oflag = 0; // no remapping, no delays
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tty.c_cc[VMIN] = 0; // read doesn't block
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tty.c_cc[VTIME] = 5; // 0.5 seconds read timeout
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tty.c_iflag &= ~(IXON | IXOFF | IXANY); // shut off xon/xoff ctrl
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tty.c_cflag |= (CLOCAL | CREAD);// ignore modem controls,
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// enable reading
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tty.c_cflag &= ~(PARENB | PARODD); // shut off parity
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tty.c_cflag |= parity;
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tty.c_cflag &= ~CSTOPB;
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tty.c_cflag &= ~CRTSCTS;
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if (tcsetattr (fd, TCSANOW, &tty) != 0) {
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fprintf(stderr, "error %d from tcsetattr", errno);
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return -1;
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}
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return 0;
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}
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void set_blocking(int fd, int should_block)
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{
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struct termios tty;
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memset(&tty, 0, sizeof tty);
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if (tcgetattr (fd, &tty) != 0) {
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fprintf(stderr, "error %d from tggetattr", errno);
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return;
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}
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tty.c_cc[VMIN] = should_block ? 1 : 0;
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tty.c_cc[VTIME] = 1; // 0.1 seconds read timeout
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if (tcsetattr (fd, TCSANOW, &tty) != 0) {
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fprintf(stderr, "error %d setting term attributes", errno);
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}
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}
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