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/* $OpenBSD: tty.c,v 1.9 2006/03/14 22:08:01 deraadt Exp $ */
#include "sh.h"
#include <sys/stat.h>
#define EXTERN
#include "tty.h"
#undef EXTERN
/* Initialize tty_fd. Used for saving/reseting 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;
if (tty_fd >= 0) {
close(tty_fd);
tty_fd = -1;
}
tty_devtty = 1;
if ((tfd = open("/dev/tty", O_RDWR, 0)) < 0) {
tty_devtty = 0;
warningf(false, "No controlling tty (open /dev/tty: %s)",
strerror(errno));
}
if (tfd < 0) {
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, FDBASE)) < 0) {
warningf(false, "j_ttyinit: dup of tty fd failed: %s",
strerror(errno));
} else if (fcntl(tty_fd, F_SETFD, FD_CLOEXEC) < 0) {
warningf(false, "j_ttyinit: can't set close-on-exec flag: %s",
strerror(errno));
close(tty_fd);
tty_fd = -1;
} else if (init_ttystate)
tcgetattr(tty_fd, &tty_state);
if (do_close)
close(tfd);
}
void
tty_close(void)
{
if (tty_fd >= 0) {
close(tty_fd);
tty_fd = -1;
}
}
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