Overview
| Comment: | make safekill use _NET_CLOSE_WINDOW extension where available instead of XDestroyWindow, which is super unfriendly and frequently crashes or hard-locks multi-window applications. XDestroyWindow is still available as a fallback if the extension fails; `export k_safekill_fallback=0` to stop this |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
12c34052e43ecca3f7c0b35b4d80d7bc |
| User & Date: | lexi on 2019-04-12 00:49:13 |
| Other Links: | manifest | tags |
Context
|
2019-04-13
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| 11:22 | add bgrd check-in: 011cb3726d user: lexi tags: trunk | |
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2019-04-12
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| 00:49 | make safekill use _NET_CLOSE_WINDOW extension where available instead of XDestroyWindow, which is super unfriendly and frequently crashes or hard-locks multi-window applications. XDestroyWindow is still available as a fallback if the extension fails; `export k_safekill_fallback=0` to stop this check-in: 12c34052e4 user: lexi tags: trunk | |
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2019-04-08
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| 02:26 | prettify header check-in: 8d306ffbd5 user: lexi tags: trunk | |
Changes
Modified safekill.c from [d7a13fcb31] to [54b90bee6d].
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* $ cc -Ofast safekill.c -lX11 -lc -osafekill
* © affero general public license
* a utility to make it harder to accidentally nuke
* important windows on i3wm or whatever. */
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
typedef enum { false, true } bool;
char* isvital(char* str) {
start: // tail calls for dipshits
................................................................................
++str; goto start;
} else {
if (str[1] == 'V' && str[2] == '}')
return str;
else { ++str; goto start; }
}
}
int main(const int argc, const char** argv) {
Display *display;
Window focus;
int revert;
bool active;
enum { vitalize, devitalize, hardkill, softkill } op;
if (argc > 3) goto usage;
................................................................................
unsigned long temp = strtoul(argv[2], NULL, 0);
if (errno == EINVAL || errno == ERANGE) goto usage;
if (temp == 0) goto usage;
focus = (Window)temp;
}
if(op == hardkill) {
XDestroyWindow(display,focus);
XSync(display,false);
return 0;
}
XClassHint xclh;
if (XGetClassHint(display,focus,&xclh)) {
char* v;
................................................................................
if (op == vitalize) return 0; // nothing need be done
else if (op == devitalize) {
strcpy(v, v+3);
XSetClassHint(display,focus,&xclh);
XSync(display,false);
} else if (op == softkill) {
printf("softkill forbidden\n");
return 1; // ACCESS DENIED
}
} else {
if (op == vitalize) {
size_t sz=strlen(xclh.res_class); // TODO: remove double-walk
xclh.res_class=realloc(xclh.res_class, sz+4);
xclh.res_class[sz]='{';
................................................................................
xclh.res_class[sz+2]='}';
xclh.res_class[sz+3]=0;
XSetClassHint(display,focus,&xclh);
XSync(display,false);
} else if (op == devitalize) return 0;
else if (op == softkill) {
// ice that motherfucker
XDestroyWindow(display,focus);
XSync(display,false);
return 3;
}
}
} else {
printf("\x1b[1merror:\x1b[m bad window\n");
goto usage;
}
return 0;
usage:
#define info "\x1b[34m-- "
#define param "\x1b[32m"
#define eol "\x1b[m\n"
#define bold "\x1b[1m"
#define nl " "
printf(bold "usage:\x1b[0m %s " " " info "kill active window if non-vital" eol
nl "%1$s -v " param "[id] " info "make [id] or active window vital" eol
nl "%1$s -c " param "[id] " info "clear vital flag on [id] or active window" eol
nl "%1$s -q " param "[id] " info "'emergency' kill w/o reference to vital flag" eol,
argv[0]);
return 1;
}
|
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* $ cc -Ofast safekill.c -lX11 -lc -osafekill * © affero general public license * a utility to make it harder to accidentally nuke * important windows on i3wm or whatever. */ #include <X11/Xlib.h> #include <X11/Xutil.h> #include <X11/Xatom.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> typedef enum { false, true } bool; char* isvital(char* str) { start: // tail calls for dipshits ................................................................................ ++str; goto start; } else { if (str[1] == 'V' && str[2] == '}') return str; else { ++str; goto start; } } } Display *display; void killwin(Window w) { XEvent ev; long mask = SubstructureRedirectMask | SubstructureNotifyMask; ev.xclient.type = ClientMessage; ev.xclient.serial = 0; ev.xclient.send_event = True; ev.xclient.message_type = XInternAtom(display, "_NET_CLOSE_WINDOW", False); ev.xclient.window = w; ev.xclient.format = 32; if(!XSendEvent(display, DefaultRootWindow(display), False, mask, &ev)) { char* fallback = getenv("k_safekill_fallback"); bool nofb = (*fallback == '0' && fallback[1] == 0); fprintf(stderr,"\x1b[1mwarning:\x1b[m cannot send _NET_CLOSE_WINDOW event to root window; is your window manager okay?"); if (nofb) { fprintf(stderr,"\n"); } else { fprintf(stderr," falling back to XDestroyWindow, but this may wreck your shit - lots of multi-win apps do *not* like it.\n"); XDestroyWindow(display,w); } } } int main(const int argc, const char** argv) { Window focus; int revert; bool active; enum { vitalize, devitalize, hardkill, softkill } op; if (argc > 3) goto usage; ................................................................................ unsigned long temp = strtoul(argv[2], NULL, 0); if (errno == EINVAL || errno == ERANGE) goto usage; if (temp == 0) goto usage; focus = (Window)temp; } if(op == hardkill) { killwin(focus); XSync(display,false); return 0; } XClassHint xclh; if (XGetClassHint(display,focus,&xclh)) { char* v; ................................................................................ if (op == vitalize) return 0; // nothing need be done else if (op == devitalize) { strcpy(v, v+3); XSetClassHint(display,focus,&xclh); XSync(display,false); } else if (op == softkill) { fprintf(stderr, "softkill forbidden\n"); return 1; // ACCESS DENIED } } else { if (op == vitalize) { size_t sz=strlen(xclh.res_class); // TODO: remove double-walk xclh.res_class=realloc(xclh.res_class, sz+4); xclh.res_class[sz]='{'; ................................................................................ xclh.res_class[sz+2]='}'; xclh.res_class[sz+3]=0; XSetClassHint(display,focus,&xclh); XSync(display,false); } else if (op == devitalize) return 0; else if (op == softkill) { // ice that motherfucker killwin(focus); XSync(display,false); return 3; } } } else { fprintf(stderr,"\x1b[1merror:\x1b[m bad window\n"); goto usage; } return 0; usage: #define info "\x1b[34m-- " #define param "\x1b[32m" #define eol "\x1b[m\n" #define bold "\x1b[1m" #define nl " " fprintf(stderr, bold "usage:\x1b[0m %s " " " info "kill active window if non-vital" eol nl "%1$s -v " param "[id] " info "make [id] or active window vital" eol nl "%1$s -c " param "[id] " info "clear vital flag on [id] or active window" eol nl "%1$s -q " param "[id] " info "'emergency' kill w/o reference to vital flag" eol, argv[0]); return 1; } |