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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <sys/select.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <string.h>
static void set_raw_mode(int fd) {
struct termios tios;
if (tcgetattr(fd, &tios) < 0) {
perror("tcgetattr");
exit(1);
}
tios.c_lflag &= ~(ICANON | ISIG | IEXTEN | ECHO);
tios.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
tios.c_cflag &= ~(CSIZE | PARENB);
tios.c_cflag |= CS8;
tios.c_oflag &= ~(OPOST);
tios.c_cc[VMIN] = 1;
tios.c_cc[VTIME] = 0;
if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
perror("tcsetattr");
exit(1);
}
}
static void forward_io(int master_fd) {
fd_set rfds;
char buf[4096];
ssize_t n;
while (1) {
FD_ZERO(&rfds);
FD_SET(STDIN_FILENO, &rfds);
FD_SET(master_fd, &rfds);
int maxfd = (master_fd > STDIN_FILENO) ? master_fd : STDIN_FILENO;
if (select(maxfd + 1, &rfds, NULL, NULL, NULL) < 0) {
if (errno == EINTR) continue;
perror("select");
exit(1);
}
if (FD_ISSET(STDIN_FILENO, &rfds)) {
n = read(STDIN_FILENO, buf, sizeof(buf));
if (n <= 0) {
if (n < 0) perror("read stdin");
break;
}
if (write(master_fd, buf, n) != n) {
perror("write to master");
exit(1);
}
}
if (FD_ISSET(master_fd, &rfds)) {
n = read(master_fd, buf, sizeof(buf));
if (n <= 0) {
if (n < 0 && errno != EIO) perror("read master");
break;
}
if (write(STDOUT_FILENO, buf, n) != n) {
perror("write to stdout");
exit(1);
}
}
}
}
int main(int argc, char *argv[]) {
int master_fd;
char *slave_name;
struct winsize ws;
master_fd = posix_openpt(O_RDWR | O_NOCTTY);
if (master_fd < 0) {
perror("posix_openpt");
exit(1);
}
if (grantpt(master_fd) < 0) {
perror("grantpt");
exit(1);
}
if (unlockpt(master_fd) < 0) {
perror("unlockpt");
exit(1);
}
slave_name = ptsname(master_fd);
if (!slave_name) {
perror("ptsname");
exit(1);
}
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == 0) {
ioctl(master_fd, TIOCSWINSZ, &ws);
}
fprintf(stderr, "TAKETTY_PTY=%s\n", slave_name);
fflush(stderr);
set_raw_mode(STDIN_FILENO);
forward_io(master_fd);
close(master_fd);
return 0;
}
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