5b9a52be7e
The problem fixed by this patch can be reproduced on Linux with the following steps. - Access NULL pointer intentionally in ProcessOtherEvent on key press. - Instead of saving core dump to a file, write it into a pipe. echo "|/usr/sbin/my-core-dumper" > /proc/sys/kernel/core_pattern - Dump the core by pressing a key. While the core is being dumped into the pipe, the smart schedule timer will cause a pending SIGALRM. Linux kernel stops writing data to the pipe when there are pending signals. This causes the core dump to be truncated. On my system I'm expecting a 6 MB dump but the size will be 60 kB instead. The problem is solved if we block the SIGALRM caused by expired smart schedule timer. I haven't been able to reproduce this problem in the following cases. - Save core dump to a file instead of a pipe. - kill -SEGV `pidof Xorg` - Press a key to dump core while gdb is attached to Xorg. - Give option -dumbSched to Xorg. Also note that the fix works only when NoTrapSignals has the default value FALSE. The problem can still be reproduced if error signals aren't trapped. In addition to pending SIGALRM, there is a similar problem with pending SIGIO from the keyboard driver during core dump. Signed-off-by: Rami Ylimaki <ext-rami.ylimaki@nokia.com> Reviewed-by: Keith Packard <keithp@keithp.com> Signed-off-by: Keith Packard <keithp@keithp.com>
319 lines
11 KiB
C
319 lines
11 KiB
C
/*
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* Copyright 2001,2002 Red Hat Inc., Durham, North Carolina.
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*
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation on the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NON-INFRINGEMENT. IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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/*
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* Authors:
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* Rickard E. (Rik) Faith <faith@redhat.com>
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <X11/Xlib.h>
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#include <X11/XKBlib.h>
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#include <X11/extensions/XInput.h>
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#include <X11/extensions/XKB.h>
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#include <X11/extensions/XKBstr.h>
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#include <X11/extensions/dmxext.h>
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#include <sys/time.h>
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static const char *core(DMXInputAttributes *iinf)
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{
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if (iinf->isCore) return "core";
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else if (iinf->sendsCore) return "extension (sends core events)";
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else return "extension";
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}
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static void printdmxinfo(Display *display, int id)
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{
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int event_base;
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int error_base;
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int major_version, minor_version, patch_version;
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DMXInputAttributes iinf;
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Display *backend;
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char *backendname = NULL;
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if (!DMXQueryExtension(display, &event_base, &error_base)) return;
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if (!DMXQueryVersion(display, &major_version, &minor_version,
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&patch_version)) return;
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if (major_version == 1 && minor_version == 0) return; /* too old */
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if (!DMXGetInputAttributes(display, id, &iinf)) return;
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printf(" DMX Information: ");
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if (iinf.detached) printf("detached ");
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else printf("active ");
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switch (iinf.inputType) {
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case DMXLocalInputType:
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printf("local, %s", core(&iinf));
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break;
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case DMXConsoleInputType:
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printf("console %s, %s", iinf.name, core(&iinf));
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break;
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case DMXBackendInputType:
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if (iinf.physicalId >= 0) {
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if ((backend = XOpenDisplay(iinf.name))) {
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XExtensionVersion *ext = XGetExtensionVersion(backend, INAME);
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if (ext && ext != (XExtensionVersion *)NoSuchExtension) {
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int count, i;
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XDeviceInfo *devInfo = XListInputDevices(backend, &count);
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if (devInfo) {
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for (i = 0; i < count; i++) {
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if ((unsigned)iinf.physicalId == devInfo[i].id
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&& devInfo[i].name) {
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backendname = strdup(devInfo[i].name);
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break;
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}
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}
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XFreeDeviceList(devInfo);
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}
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}
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XCloseDisplay(backend);
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}
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}
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printf("backend o%d/%s",iinf.physicalScreen, iinf.name);
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if (iinf.physicalId >= 0) printf("/id%d", iinf.physicalId);
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if (backendname) {
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printf("=%s", backendname);
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free(backendname);
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}
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printf(" %s", core(&iinf));
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break;
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}
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printf("\n");
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}
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int main(int argc, char **argv)
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{
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Display *display = NULL;
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int device = -1;
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int newmouse = -1;
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int newkbd = -1;
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int count;
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int i, j;
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XDeviceInfo *devInfo;
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XExtensionVersion *ext;
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if (argc == 2 || argc == 3 || argc == 4 || argc == 5) {
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if (!(display = XOpenDisplay(argv[1]))) {
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printf("Cannot open display %s\n", argv[1]);
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return -1;
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}
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if (argc >= 3) device = strtol(argv[2], NULL, 0);
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if (argc >= 4) newmouse = strtol(argv[3], NULL, 0);
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if (argc >= 5) newkbd = strtol(argv[4], NULL, 0);
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} else {
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printf("Usage: %s display [device] [newmouse] [newkbd]\n", argv[0]);
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return -1;
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}
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if (!display && !(display = XOpenDisplay(NULL))) {
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printf("Cannot open default display\n");
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return -1;
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}
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ext = XGetExtensionVersion(display, INAME);
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if (!ext || ext == (XExtensionVersion *)NoSuchExtension) {
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printf("No XInputExtension\n");
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return -1;
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}
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printf("%s version %d.%d\n",
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INAME, ext->major_version, ext->minor_version);
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if (!(devInfo = XListInputDevices(display, &count)) || !count) {
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printf("Cannot list devices\n");
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return -1;
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}
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for (i = 0; i < count; i++) {
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XAnyClassPtr any;
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const char *kind = "Unknown";
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int has_key = 0;
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switch (devInfo[i].use) {
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case IsXPointer: kind = "XPointer"; break;
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case IsXKeyboard: kind = "XKeyboard"; break;
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case IsXExtensionDevice: kind = "XExtensionDevice"; break;
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}
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printf("%2lu %-20.20s %-16.16s",
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(long unsigned)devInfo[i].id,
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devInfo[i].name ? devInfo[i].name : "", kind);
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for (j = 0, any = devInfo[i].inputclassinfo;
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j < devInfo[i].num_classes;
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any = (XAnyClassPtr)((char *)any + any->length), j++) {
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const char *class = "unk";
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switch (any->class) {
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case KeyClass: class = "key"; ++has_key; break;
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case ButtonClass: class = "btn"; break;
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case ValuatorClass: class = "val"; break;
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case FeedbackClass: class = "fdb"; break;
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case ProximityClass: class = "prx"; break;
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case FocusClass: class = "foc"; break;
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case OtherClass: class = "oth"; break;
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}
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printf(" %s", class);
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}
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printf("\n");
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printdmxinfo(display, i);
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if (has_key) {
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XkbDescPtr xkb;
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if ((xkb = XkbGetKeyboard(display,
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XkbAllComponentsMask,
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devInfo[i].id))) {
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printf(" Xkb Information:\n");
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printf(" Device id = %d\n", xkb->device_spec);
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printf(" Min keycode = 0x%02x\n", xkb->min_key_code);
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printf(" Max keycode = 0x%02x\n", xkb->max_key_code);
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#define PRINTNAME(x) \
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printf(" %s = %s\n", \
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#x, xkb->names->x ? XGetAtomName(display, xkb->names->x) : "")
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PRINTNAME(keycodes);
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PRINTNAME(geometry);
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PRINTNAME(symbols);
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PRINTNAME(types);
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PRINTNAME(compat);
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}
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}
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}
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if (newmouse >= 0) {
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XDevice *dev;
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printf("Trying to make device %d core mouse\n", newmouse);
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dev = XOpenDevice(display, devInfo[newmouse].id);
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printf("Status = %d\n",
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XChangePointerDevice(display, dev, 0, 1));
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return 0;
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}
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if (newkbd >= 0) {
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XDevice *dev;
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printf("Trying to make device %d core keyboard\n", newkbd);
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dev = XOpenDevice(display, devInfo[newkbd].id);
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printf("Status = %d\n",
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XChangeKeyboardDevice(display, dev));
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return 0;
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}
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if (device >=0){
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#define MAX_EVENTS 100
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int cnt = 0;
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XDevice *dev;
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XEventClass event_list[MAX_EVENTS];
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int event_type[MAX_EVENTS];
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const char *names[MAX_EVENTS];
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int total = 0;
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#define ADD(type) \
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if (cnt >= MAX_EVENTS) OsAbort(); \
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names[cnt] = #type; \
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type(dev, event_type[cnt], event_list[cnt]); \
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if (event_type[cnt]) ++cnt
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dev = XOpenDevice(display, devInfo[device].id);
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ADD(DeviceKeyPress);
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ADD(DeviceKeyRelease);
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ADD(DeviceButtonPress);
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ADD(DeviceButtonRelease);
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ADD(DeviceMotionNotify);
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ADD(DeviceFocusIn);
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ADD(DeviceFocusOut);
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ADD(ProximityIn);
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ADD(ProximityOut);
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ADD(DeviceStateNotify);
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ADD(DeviceMappingNotify);
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ADD(ChangeDeviceNotify);
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for (i = 0; i < cnt; i++) {
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printf("Waiting for %s events of type %d (%lu) on 0x%08lx\n",
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names[i],
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event_type[i], (unsigned long)event_list[i],
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(long unsigned)DefaultRootWindow(display));
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}
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XSelectExtensionEvent(display, DefaultRootWindow(display),
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event_list, cnt);
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for (;;) {
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XEvent event;
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XNextEvent(display, &event);
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for (i = 0; i < cnt; i++) {
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XDeviceMotionEvent *e = (XDeviceMotionEvent *)&event;
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XDeviceButtonEvent *b = (XDeviceButtonEvent *)&event;
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if (event.type == event_type[i]) {
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printf("%s id=%lu (%d @ %d,%d; s=0x%04x, d=%d, t=%lu)"
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" axes_count=%d first=%d %d %d %d %d %d %d\n",
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names[i],
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(long unsigned)e->deviceid,
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e->type,
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e->x, e->y,
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e->device_state,
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b->button,
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(long unsigned)b->time,
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e->axes_count,
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e->first_axis,
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e->axis_data[0],
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e->axis_data[1],
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e->axis_data[2],
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e->axis_data[3],
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e->axis_data[4],
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e->axis_data[5]);
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}
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}
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++total;
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#if 0
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/* Used to check motion history for
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* extension devices. */
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if (!(total % 10)) {
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XDeviceTimeCoord *tc;
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int n, m, a;
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struct timeval tv;
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unsigned long ms;
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gettimeofday(&tv, NULL);
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ms = tv.tv_sec * 1000 + tv.tv_usec / 1000;
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tc = XGetDeviceMotionEvents(display, dev, ms-1000, ms,
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&n, &m, &a);
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printf("Got %d events of mode %s with %d axes\n",
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n, m == Absolute ? "Absolute" : "Relative", a);
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for (i = 0; i < n && i < 10; i++) {
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printf(" %d: %lu %d %d\n",
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i, tc[i].time, tc[i].data[0], tc[i].data[1]);
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}
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XFreeDeviceMotionEvents(tc);
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}
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#endif
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}
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}
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XCloseDisplay(display);
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return 0;
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}
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