/* vi: set sw=4 ts=4: */ /* * Utility routines. * * Copyright (C) many different people. If you wrote this, please * acknowledge your work. * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ #include "libbb.h" /* From <linux/kd.h> */ enum { KDGKBTYPE = 0x4B33 }; /* get keyboard type */ static int open_a_console(const char *fnam) { int fd; /* try read-write */ fd = open(fnam, O_RDWR); /* if failed, try read-only */ if (fd < 0 && errno == EACCES) fd = open(fnam, O_RDONLY); /* if failed, try write-only */ if (fd < 0 && errno == EACCES) fd = open(fnam, O_WRONLY); return fd; } /* * 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). */ int FAST_FUNC get_console_fd_or_die(void) { static const char *const console_names[] = { DEV_CONSOLE, CURRENT_VC, CURRENT_TTY }; int fd; for (fd = 2; fd >= 0; fd--) { int fd4name; int choice_fd; char arg; fd4name = open_a_console(console_names[fd]); chk_std: choice_fd = (fd4name >= 0 ? fd4name : fd); arg = 0; if (ioctl(choice_fd, KDGKBTYPE, &arg) == 0) return choice_fd; if (fd4name >= 0) { close(fd4name); fd4name = -1; goto chk_std; } } bb_simple_error_msg_and_die("can't open console"); } /* From <linux/vt.h> */ enum { VT_ACTIVATE = 0x5606, /* make vt active */ VT_WAITACTIVE = 0x5607 /* wait for vt active */ }; void FAST_FUNC console_make_active(int fd, const int vt_num) { xioctl(fd, VT_ACTIVATE, (void *)(ptrdiff_t)vt_num); xioctl(fd, VT_WAITACTIVE, (void *)(ptrdiff_t)vt_num); }