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#include <stdio.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
int main(int argc, char *argv[])
{
if (argc < 2) {
fprintf(stderr, "Usage: %s /dev/tty[0-9]+ [COMMANDS ...]\n", argv[0]);
fprintf(stderr, "If COMMANDS is blank, write only a new line.\n");
fprintf(stderr, "You can obtain the tty device from a particular terminal via the 'tty' command.\n");
fprintf(stderr, "Please note, you may have to run this program as root.\n");
return 1;
}
int ttyfd;
if ((ttyfd = open(argv[1], O_WRONLY)) == -1) {
perror("open");
return errno;
}
for (int i = 2; i < argc; ++i) {
for (char *c = argv[i]; *c; ++c) {
if (ioctl(ttyfd, TIOCSTI, c) == -1) {
perror("ioctl");
return errno;
}
}
if (i != argc - 1 && ioctl(ttyfd, TIOCSTI, " ") == -1) {
perror("ioctl");
return errno;
}
}
if (ioctl(ttyfd, TIOCSTI, "\n") == -1) {
perror("ioctl");
return errno;
}
return 0;
}
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