mirror of
https://github.com/TorqueGameEngines/Torque3D.git
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107 lines
2.1 KiB
C
107 lines
2.1 KiB
C
/*
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fbmngplay - fb console MNG player.
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(c) 2001 by Stefan Reinauer, <stepan :at: suse.de>
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This program is based on mngplay, part of libmng, written and (C) by
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Ralph Giles <giles :at: ashlu.bc.ca>
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This program my be redistributed under the terms of the
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GNU General Public Licence, version 2, or at your preference,
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any later version.
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This file is based on getfd.c from the kbd package.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <linux/kd.h>
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#include <linux/vt.h>
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#include <sys/ioctl.h>
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#include "console.h"
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int start_console = 0;
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/*
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* getfd.c
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*
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* Get an fd for use with kbd/console ioctls.
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* We try several things because opening /dev/console will fail
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* if someone else used X (which does a chown on /dev/console).
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*/
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static int
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is_a_console(const int fd) {
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char arg;
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arg = 0;
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return (ioctl(fd, KDGKBTYPE, &arg) == 0
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&& ((arg == KB_101) || (arg == KB_84)));
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}
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static int
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open_a_console(const char * const fnam) {
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int fd;
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fd = open(fnam, O_RDONLY);
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if (fd < 0 && errno == EACCES)
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fd = open(fnam, O_WRONLY);
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if (fd < 0)
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return -1;
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if (!is_a_console(fd)) {
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close(fd);
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return -1;
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}
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return fd;
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}
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int getfd (const char * const nm) {
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int fd;
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if (nm) {
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fd = open_a_console(nm);
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if (fd >= 0)
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return fd;
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} else {
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fd = open_a_console("/dev/tty");
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if (fd >= 0)
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return fd;
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fd = open_a_console("/dev/tty0");
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if (fd >= 0)
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return fd;
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fd = open_a_console("/dev/console");
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if (fd >= 0)
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return fd;
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for (fd = 0; fd < 3; fd++)
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if (is_a_console(fd))
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return fd;
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}
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fprintf(stderr,
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"Couldnt get a file descriptor referring to the console\n");
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exit(1); /* total failure */
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}
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int fd;
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int current_console(void)
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{
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struct vt_stat vtstat;
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if (ioctl(fd, VT_GETSTATE, &vtstat)) {
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fprintf(stderr,"fbmngplay: VT_GETSTATE\n");
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exit(1);
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}
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return vtstat.v_active;
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}
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void init_consoles(void)
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{
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// get current tty
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fd = getfd(0);
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start_console=current_console();
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}
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