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Have autocons attempt sizing of serial console

Browse Source 
If a terminal is open during autocons, that terminal
will be the size of the console.

Otherwise, fallback to 100x31.
This commit is contained in:
Jarrod Johnson 2021-03-13 12:33:53 -05:00
parent 8032ea36be
commit d3a699a8fb
1 changed files with 55 additions and 8 deletions
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63
confluent_osdeploy/utils/autocons.c
View File

@ -1,3 +1,4 @@
#include <errno.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <fcntl.h>
@ -20,20 +21,29 @@
int main(int argc, char* argv[]) {
struct termios tty;
struct termios tty2;
struct winsize ws;
unsigned width, height;
int ttyf;
int spcr;
int tmpi;
int currspeed;
int flags;
speed_t cspeed;
char buff[128];
int bufflen;
fd_set set;
struct timeval timeout;
char* offset;
uint64_t address;
spcr = open("/sys/firmware/acpi/tables/SPCR", O_RDONLY);
if (spcr < 0) {
bufflen = 0;
tmpi = open("/sys/firmware/acpi/tables/SPCR", O_RDONLY);
if (tmpi < 0) {
exit(0);
}
if (read(spcr, buff, 80) < 80) {
if (read(tmpi, buff, 80) < 80) {
exit(0);
}
close(tmpi);
if (buff[8] != 2) exit(0); //revision 2
if (buff[36] != 0) exit(0); //16550 only
if (buff[40] != 1) exit(0); //IO only
@ -69,12 +79,49 @@ int main(int argc, char* argv[]) {
}
tcgetattr(ttyf, &tty);
if (cspeed) {
cfsetospeed(&tty, B115200);
cfsetispeed(&tty, B115200);
cfsetospeed(&tty, cspeed);
cfsetispeed(&tty, cspeed);
}
printf("%s\n", buff);
tcgetattr(ttyf, &tty2);
cfmakeraw(&tty2);
tcsetattr(ttyf, TCSANOW, &tty2);
flags = fcntl(ttyf, F_GETFL, 0);
fcntl(ttyf, F_SETFL, flags | O_NONBLOCK);
while (read(ttyf, buff, 64) > 0) {
// Drain any pending reads
}
timeout.tv_sec = 0;
timeout.tv_usec = 500000;
FD_ZERO(&set);
FD_SET(ttyf, &set);
write(ttyf, "\0337\033[999;999H\033[6n\0338", 18);
while (select(ttyf + 1, &set, NULL, NULL, &timeout) > 0) {
if ((tmpi = read(ttyf, buff + bufflen, 127 - bufflen)) < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
continue;
} else {
break;
}
}
bufflen += tmpi;
buff[bufflen] = 0;
if (strchr(buff, 'R')) {
break;
}
}
fcntl(ttyf, F_SETFL, flags);
ws.ws_xpixel = 0;
ws.ws_ypixel = 0;
if (sscanf(buff, "\033[%u;%uR", &height, &width) == 2) {
ws.ws_col = width;
ws.ws_row = height;
} else {
ws.ws_col = 100;
ws.ws_row = 31;
}
ioctl(ttyf, TIOCSWINSZ, &ws);
tcsetattr(ttyf, TCSANOW, &tty);
ioctl(ttyf, TIOCCONS, 0);
printf("%s\n", buff);
}