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#include "string.h"
#include <errno.h>
#include <fcntl.h>
#include <linux/kd.h>
#include <linux/vt.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include "log.h"
#include "terminal.h"
#define TTYPATHLEN 64
int terminal_current_vt(void) {
struct vt_stat st;
int fd = open("/dev/tty0", O_RDWR | O_NOCTTY);
if (fd == -1) {
log_errorf("could not open tty0: %s", strerror(errno));
return -1;
}
int res = ioctl(fd, VT_GETSTATE, &st);
close(fd);
if (res == -1) {
log_errorf("could not retrieve VT state: %s", strerror(errno));
return -1;
}
return st.v_active;
}
int terminal_setup(int vt) {
log_debugf("setting up vt %d", vt);
if (vt == -1) {
vt = 0;
}
char path[TTYPATHLEN];
if (snprintf(path, TTYPATHLEN, "/dev/tty%d", vt) == -1) {
log_errorf("could not generate tty path: %s", strerror(errno));
return -1;
}
int fd = open(path, O_RDWR | O_NOCTTY);
if (fd == -1) {
log_errorf("could not open target tty: %s", strerror(errno));
return -1;
}
static struct vt_mode mode = {
.mode = VT_PROCESS,
.waitv = 0,
.relsig = SIGUSR1,
.acqsig = SIGUSR2,
.frsig = 0,
};
int res = ioctl(fd, VT_SETMODE, &mode);
close(fd);
if (res == -1) {
log_errorf("could not set VT mode: %s", strerror(errno));
}
return res;
}
int terminal_teardown(int vt) {
log_debugf("tearing down vt %d", vt);
if (vt == -1) {
vt = 0;
}
char path[TTYPATHLEN];
if (snprintf(path, TTYPATHLEN, "/dev/tty%d", vt) == -1) {
log_errorf("could not generate tty path: %s", strerror(errno));
return -1;
}
int fd = open(path, O_RDWR | O_NOCTTY);
if (fd == -1) {
log_errorf("could not open target tty: %s", strerror(errno));
return -1;
}
if (ioctl(fd, KDSETMODE, KD_TEXT) == -1) {
log_errorf("could not set KD graphics mode: %s", strerror(errno));
close(fd);
return -1;
}
if (ioctl(fd, KDSKBMODE, K_UNICODE) == -1) {
log_errorf("could not set KD keyboard mode: %s", strerror(errno));
close(fd);
return -1;
}
static struct vt_mode mode = {
.mode = VT_PROCESS,
.waitv = 0,
.relsig = SIGUSR1,
.acqsig = SIGUSR2,
.frsig = 0,
};
if (ioctl(fd, VT_SETMODE, &mode) == -1) {
log_errorf("could not set VT mode: %s", strerror(errno));
close(fd);
return -1;
}
close(fd);
return 0;
}
int terminal_switch_vt(int vt) {
log_debugf("switching to vt %d", vt);
int fd = open("/dev/tty0", O_RDWR | O_NOCTTY);
if (fd == -1) {
log_errorf("could not open tty0: %s", strerror(errno));
return -1;
}
static struct vt_mode mode = {
.mode = VT_PROCESS,
.waitv = 0,
.relsig = SIGUSR1,
.acqsig = SIGUSR2,
.frsig = 0,
};
if (ioctl(fd, VT_SETMODE, &mode) == -1) {
log_errorf("could not set VT mode: %s", strerror(errno));
close(fd);
return -1;
}
if (ioctl(fd, VT_ACTIVATE, vt) == -1) {
log_errorf("could not activate VT: %s", strerror(errno));
close(fd);
return -1;
}
close(fd);
return 0;
}
int terminal_ack_switch(void) {
log_debug("acking vt switch");
int fd = open("/dev/tty0", O_RDWR | O_NOCTTY);
if (fd == -1) {
log_errorf("could not open tty0: %s", strerror(errno));
return -1;
}
int res = ioctl(fd, VT_RELDISP, VT_ACKACQ);
close(fd);
if (res == -1) {
log_errorf("could not ack VT switch: %s", strerror(errno));
}
return res;
}
int terminal_set_keyboard(int vt, bool enable) {
log_debugf("setting KD keyboard state to %d on vt %d", enable, vt);
if (vt == -1) {
vt = 0;
}
char path[TTYPATHLEN];
if (snprintf(path, TTYPATHLEN, "/dev/tty%d", vt) == -1) {
log_errorf("could not generate tty path: %s", strerror(errno));
return -1;
}
int fd = open(path, O_RDWR | O_NOCTTY);
if (fd == -1) {
log_errorf("could not generate tty path: %s", strerror(errno));
return -1;
}
int res = ioctl(fd, KDSKBMODE, enable ? K_UNICODE : K_OFF);
close(fd);
if (res == -1) {
log_errorf("could not set KD keyboard mode: %s", strerror(errno));
}
return res;
}
int terminal_set_graphics(int vt, bool enable) {
log_debugf("setting KD graphics state to %d on vt %d", enable, vt);
if (vt == -1) {
vt = 0;
}
char path[TTYPATHLEN];
if (snprintf(path, TTYPATHLEN, "/dev/tty%d", vt) == -1) {
log_errorf("could not generate tty path: %s", strerror(errno));
return -1;
}
int fd = open(path, O_RDWR | O_NOCTTY);
if (fd == -1) {
log_errorf("could not generate tty path: %s", strerror(errno));
return -1;
}
int res = ioctl(fd, KDSETMODE, enable ? KD_GRAPHICS : KD_TEXT);
close(fd);
if (res == -1) {
log_errorf("could not set KD graphics mode: %s", strerror(errno));
}
return res;
}
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