mirror of
https://github.com/hsoft/collapseos.git
synced 2024-12-26 04:18:05 +11:00
103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <termios.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
void mread(int fd, char *s, int count)
|
|
{
|
|
while (count) {
|
|
while (read(fd, s, 1) == 0) {
|
|
usleep(1000);
|
|
}
|
|
s++;
|
|
count--;
|
|
}
|
|
}
|
|
|
|
void sendcmd(int fd, char *cmd)
|
|
{
|
|
char junk[2];
|
|
while (*cmd) {
|
|
write(fd, cmd, 1);
|
|
read(fd, &junk, 1);
|
|
cmd++;
|
|
// The other side is sometimes much slower than us and if we don't let
|
|
// it breathe, it can choke.
|
|
usleep(1000);
|
|
}
|
|
write(fd, "\r", 1);
|
|
mread(fd, junk, 2); // sends back \r\n
|
|
usleep(1000);
|
|
}
|
|
|
|
// Send a cmd and also read the "> " prompt
|
|
void sendcmdp(int fd, char *cmd)
|
|
{
|
|
char junk[2];
|
|
sendcmd(fd, cmd);
|
|
mread(fd, junk, 2);
|
|
}
|
|
|
|
// from https://stackoverflow.com/a/6947758
|
|
// discussion from https://stackoverflow.com/a/26006680 is interesting,
|
|
// but we don't want POSIX compliance.
|
|
|
|
int set_interface_attribs(int fd, int speed, int parity)
|
|
{
|
|
struct termios tty;
|
|
if (tcgetattr (fd, &tty) != 0) {
|
|
fprintf(stderr, "error %d from tcgetattr", errno);
|
|
return -1;
|
|
}
|
|
|
|
if (speed) {
|
|
cfsetospeed (&tty, speed);
|
|
cfsetispeed (&tty, speed);
|
|
}
|
|
|
|
tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS8; // 8-bit chars
|
|
// disable IGNBRK for mismatched speed tests; otherwise receive break
|
|
// as \000 chars
|
|
tty.c_iflag &= ~IGNBRK; // disable break processing
|
|
tty.c_lflag = 0; // no signaling chars, no echo,
|
|
// no canonical processing
|
|
tty.c_oflag = 0; // no remapping, no delays
|
|
tty.c_cc[VMIN] = 0; // read doesn't block
|
|
tty.c_cc[VTIME] = 5; // 0.5 seconds read timeout
|
|
|
|
tty.c_iflag &= ~(IXON | IXOFF | IXANY); // shut off xon/xoff ctrl
|
|
|
|
tty.c_cflag |= (CLOCAL | CREAD);// ignore modem controls,
|
|
// enable reading
|
|
tty.c_cflag &= ~(PARENB | PARODD); // shut off parity
|
|
tty.c_cflag |= parity;
|
|
tty.c_cflag &= ~CSTOPB;
|
|
tty.c_cflag &= ~CRTSCTS;
|
|
|
|
if (tcsetattr (fd, TCSANOW, &tty) != 0) {
|
|
fprintf(stderr, "error %d from tcsetattr", errno);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void set_blocking(int fd, int should_block)
|
|
{
|
|
struct termios tty;
|
|
memset(&tty, 0, sizeof tty);
|
|
if (tcgetattr (fd, &tty) != 0) {
|
|
fprintf(stderr, "error %d from tggetattr", errno);
|
|
return;
|
|
}
|
|
|
|
tty.c_cc[VMIN] = should_block ? 1 : 0;
|
|
tty.c_cc[VTIME] = 1; // 0.1 seconds read timeout
|
|
|
|
if (tcsetattr (fd, TCSANOW, &tty) != 0) {
|
|
fprintf(stderr, "error %d setting term attributes", errno);
|
|
}
|
|
}
|
|
|