| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| #include <linux/kd.h> |
| #include <sys/ioctl.h> |
| #include "nls.h" |
| #include "getfd.h" |
| |
| /* |
| * getfd.c |
| * |
| * Get an fd for use with kbd/console ioctls. |
| * We try several things because opening /dev/console will fail |
| * if someone else used X (which does a chown on /dev/console). |
| */ |
| |
| static int |
| is_a_console(int fd) { |
| char arg; |
| |
| arg = 0; |
| return (ioctl(fd, KDGKBTYPE, &arg) == 0 |
| && ((arg == KB_101) || (arg == KB_84))); |
| } |
| |
| static int |
| open_a_console(const char *fnam) { |
| int fd; |
| |
| /* |
| * For ioctl purposes we only need some fd and permissions |
| * do not matter. But setfont:activatemap() does a write. |
| */ |
| fd = open(fnam, O_RDWR); |
| if (fd < 0 && errno == EACCES) |
| fd = open(fnam, O_WRONLY); |
| if (fd < 0 && errno == EACCES) |
| fd = open(fnam, O_RDONLY); |
| if (fd < 0) |
| return -1; |
| if (!is_a_console(fd)) { |
| close(fd); |
| return -1; |
| } |
| return fd; |
| } |
| |
| int getfd(const char *fnam) { |
| int fd; |
| |
| if (fnam) { |
| fd = open_a_console(fnam); |
| if (fd >= 0) |
| return fd; |
| fprintf(stderr, |
| _("Couldnt open %s\n"), fnam); |
| exit(1); |
| } |
| |
| fd = open_a_console("/dev/tty"); |
| if (fd >= 0) |
| return fd; |
| |
| fd = open_a_console("/dev/tty0"); |
| if (fd >= 0) |
| return fd; |
| |
| fd = open_a_console("/dev/vc/0"); |
| if (fd >= 0) |
| return fd; |
| |
| fd = open_a_console("/dev/console"); |
| if (fd >= 0) |
| return fd; |
| |
| for (fd = 0; fd < 3; fd++) |
| if (is_a_console(fd)) |
| return fd; |
| |
| fprintf(stderr, |
| _("Couldnt get a file descriptor referring to the console\n")); |
| exit(1); /* total failure */ |
| } |