401 lines
11 KiB
C
401 lines
11 KiB
C
/*
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* Copyright 1992 by Orest Zborowski <obz@Kodak.com>
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* Copyright 1993 by David Wexelblat <dwex@goblin.org>
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the names of Orest Zborowski and David Wexelblat
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* not be used in advertising or publicity pertaining to distribution of
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* the software without specific, written prior permission. Orest Zborowski
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* and David Wexelblat make no representations about the suitability of this
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* software for any purpose. It is provided "as is" without express or
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* implied warranty.
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*
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* OREST ZBOROWSKI AND DAVID WEXELBLAT DISCLAIMS ALL WARRANTIES WITH REGARD
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* TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL OREST ZBOROWSKI OR DAVID WEXELBLAT BE LIABLE
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* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#ifdef HAVE_XORG_CONFIG_H
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#include <xorg-config.h>
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#endif
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#include <X11/X.h>
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#include <X11/Xmd.h>
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#include "compiler.h"
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#include "xf86.h"
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#include "xf86Priv.h"
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#include "xf86_OSlib.h"
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#include <sys/stat.h>
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static Bool KeepTty = FALSE;
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static int VTnum = -1;
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static Bool VTSwitch = TRUE;
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static Bool ShareVTs = FALSE;
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static int activeVT = -1;
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static int vtPermSave[4];
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static char vtname[11];
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static struct termios tty_attr; /* tty state to restore */
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static int tty_mode; /* kbd mode to restore */
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static int
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saveVtPerms(void)
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{
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/* We need to use stat to get permissions. */
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struct stat svtp;
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/* Do them numerically ordered, hard coded tty0 first. */
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if (stat("/dev/tty0", &svtp) != 0)
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return 0;
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vtPermSave[0] = (int)svtp.st_uid;
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vtPermSave[1] = (int)svtp.st_gid;
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/* Now check the console we are dealing with. */
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if (stat(vtname, &svtp) != 0)
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return 0;
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vtPermSave[2] = (int)svtp.st_uid;
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vtPermSave[3] = (int)svtp.st_gid;
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return 1;
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}
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static void
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restoreVtPerms(void)
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{
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if (geteuid() == 0) {
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/* Set the terminal permissions back to before we started. */
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(void)chown("/dev/tty0", vtPermSave[0], vtPermSave[1]);
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(void)chown(vtname, vtPermSave[2], vtPermSave[3]);
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}
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}
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static void *console_handler;
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static void
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drain_console(int fd, void *closure)
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{
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tcflush(fd, TCIOFLUSH);
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}
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void
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xf86OpenConsole(void)
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{
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int i, fd = -1;
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struct vt_mode VT;
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struct vt_stat vts;
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MessageType from = X_PROBED;
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char *tty0[] = { "/dev/tty0", "/dev/vc/0", NULL };
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char *vcs[] = { "/dev/vc/%d", "/dev/tty%d", NULL };
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if (serverGeneration == 1) {
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/* when KeepTty check if we're run with euid==0 */
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if (KeepTty && geteuid() != 0)
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FatalError("xf86OpenConsole:"
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" Server must be suid root for option \"KeepTTY\"\n");
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/*
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* setup the virtual terminal manager
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*/
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if (VTnum != -1) {
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xf86Info.vtno = VTnum;
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from = X_CMDLINE;
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} else {
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i=0;
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while (tty0[i] != NULL) {
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if ((fd = open(tty0[i],O_WRONLY,0)) >= 0)
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break;
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i++;
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}
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if (fd < 0)
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FatalError(
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"xf86OpenConsole: Cannot open /dev/tty0 (%s)\n",
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strerror(errno));
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if (ShareVTs)
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{
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if (ioctl(fd, VT_GETSTATE, &vts) == 0)
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xf86Info.vtno = vts.v_active;
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else
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FatalError("xf86OpenConsole: Cannot find the current"
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" VT (%s)\n", strerror(errno));
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} else {
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if ((ioctl(fd, VT_OPENQRY, &xf86Info.vtno) < 0) ||
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(xf86Info.vtno == -1))
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FatalError("xf86OpenConsole: Cannot find a free VT: %s\n",
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strerror(errno));
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}
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close(fd);
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}
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xf86Msg(from, "using VT number %d\n\n", xf86Info.vtno);
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if (!KeepTty) {
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pid_t ppid = getppid();
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pid_t ppgid;
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ppgid = getpgid(ppid);
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/*
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* change to parent process group that pgid != pid so
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* that setsid() doesn't fail and we become process
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* group leader
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*/
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if (setpgid(0,ppgid) < 0)
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xf86Msg(X_WARNING, "xf86OpenConsole: setpgid failed: %s\n",
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strerror(errno));
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/* become process group leader */
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if ((setsid() < 0))
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xf86Msg(X_WARNING, "xf86OpenConsole: setsid failed: %s\n",
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strerror(errno));
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}
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i=0;
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while (vcs[i] != NULL) {
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sprintf(vtname, vcs[i], xf86Info.vtno); /* /dev/tty1-64 */
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if ((xf86Info.consoleFd = open(vtname, O_RDWR|O_NDELAY, 0)) >= 0)
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break;
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i++;
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}
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if (xf86Info.consoleFd < 0)
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FatalError("xf86OpenConsole: Cannot open virtual console"
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" %d (%s)\n", xf86Info.vtno, strerror(errno));
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if (!ShareVTs)
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{
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/*
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* Grab the vt ownership before we overwrite it.
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* Hard coded /dev/tty0 into this function as well for below.
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*/
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if (!saveVtPerms())
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xf86Msg(X_WARNING,
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"xf86OpenConsole: Could not save ownership of VT\n");
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if (geteuid() == 0) {
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/* change ownership of the vt */
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if (chown(vtname, getuid(), getgid()) < 0)
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xf86Msg(X_WARNING,"xf86OpenConsole: chown %s failed: %s\n",
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vtname, strerror(errno));
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/*
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* the current VT device we're running on is not
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* "console", we want to grab all consoles too
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*
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* Why is this needed??
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*/
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if (chown("/dev/tty0", getuid(), getgid()) < 0)
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xf86Msg(X_WARNING,"xf86OpenConsole: chown /dev/tty0 failed: %s\n",
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strerror(errno));
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}
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}
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/*
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* Linux doesn't switch to an active vt after the last close of a vt,
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* so we do this ourselves by remembering which is active now.
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*/
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if (ioctl(xf86Info.consoleFd, VT_GETSTATE, &vts) < 0)
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xf86Msg(X_WARNING,"xf86OpenConsole: VT_GETSTATE failed: %s\n",
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strerror(errno));
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else
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activeVT = vts.v_active;
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#if 0
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if (!KeepTty) {
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/*
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* Detach from the controlling tty to avoid char loss
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*/
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if ((i = open("/dev/tty",O_RDWR)) >= 0) {
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ioctl(i, TIOCNOTTY, 0);
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close(i);
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}
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}
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#endif
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if (!ShareVTs)
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{
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struct termios nTty;
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/*
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* now get the VT. This _must_ succeed, or else fail completely.
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*/
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if (ioctl(xf86Info.consoleFd, VT_ACTIVATE, xf86Info.vtno) < 0)
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FatalError("xf86OpenConsole: VT_ACTIVATE failed: %s\n",
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strerror(errno));
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if (ioctl(xf86Info.consoleFd, VT_WAITACTIVE, xf86Info.vtno) < 0)
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FatalError("xf86OpenConsole: VT_WAITACTIVE failed: %s\n",
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strerror(errno));
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if (ioctl(xf86Info.consoleFd, VT_GETMODE, &VT) < 0)
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FatalError("xf86OpenConsole: VT_GETMODE failed %s\n",
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strerror(errno));
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signal(SIGUSR1, xf86VTRequest);
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VT.mode = VT_PROCESS;
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VT.relsig = SIGUSR1;
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VT.acqsig = SIGUSR1;
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if (ioctl(xf86Info.consoleFd, VT_SETMODE, &VT) < 0)
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FatalError("xf86OpenConsole: VT_SETMODE VT_PROCESS failed: %s\n",
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strerror(errno));
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if (ioctl(xf86Info.consoleFd, KDSETMODE, KD_GRAPHICS) < 0)
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FatalError("xf86OpenConsole: KDSETMODE KD_GRAPHICS failed %s\n",
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strerror(errno));
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tcgetattr(xf86Info.consoleFd, &tty_attr);
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ioctl(xf86Info.consoleFd, KDGKBMODE, &tty_mode);
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if (ioctl(xf86Info.consoleFd, KDSKBMODE, K_RAW) < 0)
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FatalError("xf86OpenConsole: KDSKBMODE K_RAW failed %s\n",
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strerror(errno));
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nTty = tty_attr;
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nTty.c_iflag = (IGNPAR | IGNBRK) & (~PARMRK) & (~ISTRIP);
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nTty.c_oflag = 0;
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nTty.c_cflag = CREAD | CS8;
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nTty.c_lflag = 0;
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nTty.c_cc[VTIME]=0;
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nTty.c_cc[VMIN]=1;
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cfsetispeed(&nTty, 9600);
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cfsetospeed(&nTty, 9600);
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tcsetattr(xf86Info.consoleFd, TCSANOW, &nTty);
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/* need to keep the buffer clean, else the kernel gets angry */
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xf86SetConsoleHandler(drain_console, NULL);
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/* we really should have a InitOSInputDevices() function instead
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* of Init?$#*&Device(). So I just place it here */
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}
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} else { /* serverGeneration != 1 */
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if (!ShareVTs && VTSwitch)
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{
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/*
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* now get the VT
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*/
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if (ioctl(xf86Info.consoleFd, VT_ACTIVATE, xf86Info.vtno) < 0)
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xf86Msg(X_WARNING, "xf86OpenConsole: VT_ACTIVATE failed %s\n",
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strerror(errno));
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if (ioctl(xf86Info.consoleFd, VT_WAITACTIVE, xf86Info.vtno) < 0)
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xf86Msg(X_WARNING, "xf86OpenConsole: VT_WAITACTIVE failed %s\n",
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strerror(errno));
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}
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}
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}
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void
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xf86CloseConsole(void)
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{
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struct vt_mode VT;
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if (ShareVTs) {
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close(xf86Info.consoleFd);
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return;
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}
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if (console_handler) {
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xf86RemoveGeneralHandler(console_handler);
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console_handler = NULL;
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};
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/* Back to text mode ... */
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if (ioctl(xf86Info.consoleFd, KDSETMODE, KD_TEXT) < 0)
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xf86Msg(X_WARNING, "xf86CloseConsole: KDSETMODE failed: %s\n",
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strerror(errno));
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ioctl(xf86Info.consoleFd, KDSKBMODE, tty_mode);
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tcsetattr(xf86Info.consoleFd, TCSANOW, &tty_attr);
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if (ioctl(xf86Info.consoleFd, VT_GETMODE, &VT) < 0)
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xf86Msg(X_WARNING, "xf86CloseConsole: VT_GETMODE failed: %s\n",
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strerror(errno));
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else {
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/* set dflt vt handling */
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VT.mode = VT_AUTO;
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if (ioctl(xf86Info.consoleFd, VT_SETMODE, &VT) < 0)
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xf86Msg(X_WARNING, "xf86CloseConsole: VT_SETMODE failed: %s\n",
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strerror(errno));
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}
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if (VTSwitch)
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{
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/*
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* Perform a switch back to the active VT when we were started
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*/
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if (activeVT >= 0) {
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if (ioctl(xf86Info.consoleFd, VT_ACTIVATE, activeVT) < 0)
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xf86Msg(X_WARNING, "xf86CloseConsole: VT_ACTIVATE failed: %s\n",
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strerror(errno));
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if (ioctl(xf86Info.consoleFd, VT_WAITACTIVE, activeVT) < 0)
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xf86Msg(X_WARNING,
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"xf86CloseConsole: VT_WAITACTIVE failed: %s\n",
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strerror(errno));
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activeVT = -1;
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}
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}
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close(xf86Info.consoleFd); /* make the vt-manager happy */
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restoreVtPerms(); /* restore the permissions */
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}
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int
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xf86ProcessArgument(int argc, char *argv[], int i)
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{
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/*
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* Keep server from detaching from controlling tty. This is useful
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* when debugging (so the server can receive keyboard signals.
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*/
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if (!strcmp(argv[i], "-keeptty"))
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{
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KeepTty = TRUE;
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return 1;
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}
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if (!strcmp(argv[i], "-novtswitch"))
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{
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VTSwitch = FALSE;
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return 1;
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}
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if (!strcmp(argv[i], "-sharevts"))
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{
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ShareVTs = TRUE;
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return 1;
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}
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if ((argv[i][0] == 'v') && (argv[i][1] == 't'))
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{
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if (sscanf(argv[i], "vt%2d", &VTnum) == 0)
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{
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UseMsg();
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VTnum = -1;
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return 0;
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}
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return 1;
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}
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return 0;
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}
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void
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xf86UseMsg(void)
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{
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ErrorF("vtXX use the specified VT number\n");
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ErrorF("-keeptty ");
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ErrorF("don't detach controlling tty (for debugging only)\n");
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ErrorF("-novtswitch don't immediately switch to new VT\n");
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ErrorF("-sharevts share VTs with another X server\n");
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}
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