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/* $OpenBSD: pty.c,v 1.1 2024/06/03 08:02:22 anton Exp $ */
#include <sys/ioctl.h>
#include <err.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include "pty.h"
int
pty_open(struct pty *pty)
{
int master, slave;
master = posix_openpt(O_RDWR);
if (master == -1) {
warn("posix_openpt");
return 1;
}
if (grantpt(master) == -1) {
warn("grantpt");
return 1;
}
if (unlockpt(master) == -1) {
warn("unlockpt");
return 1;
}
slave = open(ptsname(master), O_RDWR);
if (slave == -1) {
warn("%s", ptsname(master));
return 1;
}
pty->master = master;
pty->slave = slave;
return 0;
}
void
pty_close(struct pty *pty)
{
close(pty->slave);
close(pty->master);
}
/*
* Disconnect the controlling tty, if present.
*/
int
pty_detach(struct pty *pty)
{
int fd;
fd = open("/dev/tty", O_RDWR | O_NOCTTY);
if (fd >= 0) {
(void)ioctl(fd, TIOCNOTTY, NULL);
close(fd);
}
return 0;
}
/*
* Connect the slave as the controlling tty.
*/
int
pty_attach(struct pty *pty)
{
if (ioctl(pty->slave, TIOCSCTTY, NULL) == -1) {
warn("TIOCSCTTY");
return 1;
}
return 0;
}
int
pty_drain(struct pty *pty)
{
for (;;) {
char *buf = &pty->buf.storage[pty->buf.len];
size_t bufsize = sizeof(pty->buf.storage) - pty->buf.len;
ssize_t n;
n = read(pty->master, buf, bufsize);
if (n == -1) {
warn("read");
return 1;
}
if (n == 0)
break;
/* Ensure space for NUL-terminator. */
if ((size_t)n >= bufsize) {
warnx("pty buffer too small");
return 1;
}
pty->buf.len += n;
}
return 0;
}
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