I compiled the following program on a riscv64 Ubuntu 26.04 system as
static binary
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/tty.h>
int main(int argc, char *argv[]) {
if (argc != 2) {
fprintf(stderr, "Usage: %s <device>\n", argv[0]);
return 1;
}
// Open the specified device
int fd = open(argv[1], O_RDONLY);
if (fd < 0) {
perror("Failed to open device");
return 1;
}
// Use ioctl to check if the device is a TTY
struct winsize w;
if (ioctl(fd, TIOCGWINSZ, &w) == -1) {
// If ioctl fails, it's not a tty
perror("Not a terminal (tty) or error occurred");
} else {
// If ioctl succeeds, it's a tty
printf("%s is a terminal (tty).\n", argv[1]);
}
// Close the device
close(fd);
return 0;
}
I then transferred it to the Ubuntu 26.10 container and executed it:
/tmp/check_tty /dev/pts/0
/dev/pts/0 is a terminal (tty)
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https://bugs.launchpad.net/bugs/2133188
Title:
Illegal instruction in memset under qemu-user for riscv64
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