diff options
Diffstat (limited to 'toolbox/setconsole.c')
| -rw-r--r-- | toolbox/setconsole.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/toolbox/setconsole.c b/toolbox/setconsole.c new file mode 100644 index 0000000..b0ce13f --- /dev/null +++ b/toolbox/setconsole.c @@ -0,0 +1,164 @@ +#include <stdio.h> +#include <stdlib.h> +#include <fcntl.h> +#include <string.h> +#include <linux/kd.h> +#include <linux/vt.h> +#include <errno.h> +#include <pthread.h> + +static int activate_thread_switch_vc; +static void *activate_thread(void *arg) +{ + int res; + int fd = (int)arg; + while(activate_thread_switch_vc >= 0) { + do { + res = ioctl(fd, VT_ACTIVATE, (void*)activate_thread_switch_vc); + } while(res < 0 && errno == EINTR); + if (res < 0) { + fprintf(stderr, "ioctl( vcfd, VT_ACTIVATE, vtnum) failed, %d %d %s for %d\n", res, errno, strerror(errno), activate_thread_switch_vc); + } + if(activate_thread_switch_vc >= 0) + sleep(1); + } + return NULL; +} + + +int setconsole_main(int argc, char *argv[]) +{ + int c; + int fd; + int res; + + int mode = -1; + int new_vc = 0; + int close_vc = 0; + int switch_vc = -1; + int printvc = 0; + char *ttydev = "/dev/tty0"; + + do { + c = getopt(argc, argv, "d:gtncv:poh"); + if (c == EOF) + break; + switch (c) { + case 'd': + ttydev = optarg; + break; + case 'g': + if(mode == KD_TEXT) { + fprintf(stderr, "%s: cannot specify both -g and -t\n", argv[0]); + exit(1); + } + mode = KD_GRAPHICS; + break; + case 't': + if(mode == KD_GRAPHICS) { + fprintf(stderr, "%s: cannot specify both -g and -t\n", argv[0]); + exit(1); + } + mode = KD_TEXT; + break; + case 'n': + new_vc = 1; + break; + case 'c': + close_vc = 1; + break; + case 'v': + switch_vc = atoi(optarg); + break; + case 'p': + printvc |= 1; + break; + case 'o': + printvc |= 2; + break; + case 'h': + fprintf(stderr, "%s [-d <dev>] [-v <vc>] [-gtncpoh]\n" + " -d <dev> Use <dev> instead of /dev/tty0\n" + " -v <vc> Switch to virtual console <vc>\n" + " -g Switch to graphics mode\n" + " -t Switch to text mode\n" + " -n Create and switch to new virtual console\n" + " -c Close unused virtual consoles\n" + " -p Print new virtual console\n" + " -o Print old virtual console\n" + " -h Print help\n", argv[0]); + return -1; + case '?': + fprintf(stderr, "%s: invalid option -%c\n", + argv[0], optopt); + exit(1); + } + } while (1); + if(mode == -1 && new_vc == 0 && close_vc == 0 && switch_vc == -1 && printvc == 0) { + fprintf(stderr,"%s [-d <dev>] [-v <vc>] [-gtncpoh]\n", argv[0]); + return -1; + } + + fd = open(ttydev, O_RDWR | O_SYNC); + if (fd < 0) { + fprintf(stderr, "cannot open %s\n", ttydev); + return -1; + } + + if ((printvc && !new_vc) || (printvc & 2)) { + struct vt_stat vs; + + res = ioctl(fd, VT_GETSTATE, &vs); + if (res < 0) { + fprintf(stderr, "ioctl(vcfd, VT_GETSTATE, &vs) failed, %d\n", res); + } + printf("%d\n", vs.v_active); + } + + if (new_vc) { + int vtnum; + res = ioctl(fd, VT_OPENQRY, &vtnum); + if (res < 0 || vtnum == -1) { + fprintf(stderr, "ioctl(vcfd, VT_OPENQRY, &vtnum) failed, res %d, vtnum %d\n", res, vtnum); + } + switch_vc = vtnum; + } + if (switch_vc != -1) { + pthread_t thread; + pthread_attr_t attr; + activate_thread_switch_vc = switch_vc; + pthread_attr_init(&attr); + pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); + pthread_create(&thread, &attr, activate_thread, (void*)fd); + + do { + res = ioctl(fd, VT_WAITACTIVE, (void*)switch_vc); + } while(res < 0 && errno == EINTR); + activate_thread_switch_vc = -1; + if (res < 0) { + fprintf(stderr, "ioctl( vcfd, VT_WAITACTIVE, vtnum) failed, %d %d %s for %d\n", res, errno, strerror(errno), switch_vc); + } + if(printvc & 1) + printf("%d\n", switch_vc); + + close(fd); + fd = open(ttydev, O_RDWR | O_SYNC); + if (fd < 0) { + fprintf(stderr, "cannot open %s\n", ttydev); + return -1; + } + } + if (close_vc) { + res = ioctl(fd, VT_DISALLOCATE, 0); + if (res < 0) { + fprintf(stderr, "ioctl(vcfd, VT_DISALLOCATE, 0) failed, %d\n", res); + } + } + if (mode != -1) { + if (ioctl(fd, KDSETMODE, (void*)mode) < 0) { + fprintf(stderr, "KDSETMODE %d failed\n", mode); + return -1; + } + } + return 0; +} |