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/* $OpenBSD: tty.c,v 1.19 2021/10/24 21:24:21 deraadt Exp $ */
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include "sh.h"
#include "tty.h"
int tty_fd = -1; /* dup'd tty file descriptor */
int tty_devtty; /* true if tty_fd is from /dev/tty */
struct termios tty_state; /* saved tty state */
void
tty_close(void)
{
if (tty_fd >= 0) {
close(tty_fd);
tty_fd = -1;
}
}
/* Initialize tty_fd. Used for saving/resetting tty modes upon
* foreground job completion and for setting up tty process group.
*/
void
tty_init(int init_ttystate)
{
int do_close = 1;
int tfd;
tty_close();
tty_devtty = 1;
tfd = open("/dev/tty", O_RDWR);
if (tfd == -1) {
tty_devtty = 0;
warningf(false, "No controlling tty (open /dev/tty: %s)",
strerror(errno));
do_close = 0;
if (isatty(0))
tfd = 0;
else if (isatty(2))
tfd = 2;
else {
warningf(false, "Can't find tty file descriptor");
return;
}
}
if ((tty_fd = fcntl(tfd, F_DUPFD_CLOEXEC, FDBASE)) == -1) {
warningf(false, "%s: dup of tty fd failed: %s",
__func__, strerror(errno));
} else if (init_ttystate)
tcgetattr(tty_fd, &tty_state);
if (do_close)
close(tfd);
}
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