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schange now also handles output changes, so I can use it for automatically adding and removing monitors

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also I now pass some parameters to the handler program so it knows event details
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Marisa the Magician 2017-11-02 16:41:15 +01:00
commit ec243ccb7d
1 changed files with 73 additions and 10 deletions
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schange.c
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@ -1,9 +1,11 @@
/*
schange.c : run command on screen change events from RandR.
(C)2015 Marisa Kirisame, UnSX Team. For personal use mostly.
schange.c : run command on crtc and output change events from RandR.
(C)2015-2017 Marisa Kirisame, UnSX Team. For personal use mostly.
Released under the GNU GPLv3 (or any later version).
Please refer to <https://gnu.org/licenses/gpl.txt> for license terms.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
@ -11,30 +13,91 @@
#include <xcb/xcb_event.h>
#include <xcb/randr.h>
const xcb_query_extension_reply_t *r;
xcb_connection_t *c;
xcb_screen_t *s;
char **cmdline;
char *handler = 0;
void handle_event( xcb_generic_event_t *e )
{
const xcb_query_extension_reply_t *r;
r = xcb_get_extension_data(c,&xcb_randr_id);
if ( (e->response_type&0x7f) != (r->first_event+XCB_RANDR_NOTIFY) )
return;
/* fork and exec command */
xcb_randr_notify_data_t d = ((xcb_randr_notify_event_t*)e)->u;
char* hargs[8];
hargs[0] = handler;
char geom[64];
char oname[32];
int rot, len;
char *nm;
switch ( ((xcb_randr_notify_event_t*)e)->subCode )
{
case 0:
rot = d.cc.rotation&0xf;
hargs[1] = "cc";
hargs[2] = (rot==1)?"0":(rot==2)?"90":(rot==4)?"180":"270";
hargs[3] = (d.cc.rotation&0x10)?(d.cc.rotation&0x20)?"xy":"x"
:(d.cc.rotation&0x20)?"y":"none";
snprintf(geom,64,"%ux%u%+d%+d",d.cc.width,d.cc.height,d.cc.x,
d.cc.y);
hargs[4] = geom;
hargs[5] = 0;
printf("schange: crtc change\n rotation: %s\n"
" reflection: %s\n geometry: %s\n",hargs[2],hargs[3],
hargs[4]);
break;
case 1:
hargs[1] = "oc";
xcb_randr_get_output_info_cookie_t ck;
ck = xcb_randr_get_output_info_unchecked(c,d.oc.output,
d.oc.config_timestamp);
xcb_randr_get_output_info_reply_t *inf;
inf = xcb_randr_get_output_info_reply(c,ck,0);
if ( !inf ) hargs[2] = "UNKNOWN";
else
{
len = xcb_randr_get_output_info_name_length(inf);
nm = (char*)xcb_randr_get_output_info_name(inf);
strncpy(oname,nm,len);
oname[len] = 0;
hargs[2] = oname;
}
hargs[3] = (d.oc.connection==0)?"connected"
:(d.oc.connection==1)?"disconnected":"unknown";
hargs[4] = 0;
printf("schange: output change\n name: %s\n"
" connection: %s\n",hargs[2],hargs[3]);
break;
default:
/* ??? */
printf("schange: unhandled subcode %u\n",
((xcb_randr_notify_event_t*)e)->subCode);
hargs[1] = "unknown";
hargs[2] = 0;
break;
}
/* skip everything if there's no handler registered */
if ( !handler ) return;
int pid = fork();
if ( !pid ) execvp(cmdline[0],cmdline);
if ( !pid ) execvp(hargs[0],hargs);
else waitpid(pid,0,0);
}
int main( int argc, char **argv )
{
if ( argc < 2 ) return 1;
cmdline = argv+1;
if ( argc > 1 ) handler = argv[1];
else printf("schange: warning, no handler assigned.\n");
c = xcb_connect(0,0);
r = xcb_get_extension_data(c,&xcb_randr_id);
if ( !r->present )
{
printf("schange: no RandR extension present\n");
xcb_disconnect(c);
return 1;
}
s = xcb_setup_roots_iterator(xcb_get_setup(c)).data;
xcb_randr_select_input(c,s->root,XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE);
xcb_randr_select_input(c,s->root,XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE
|XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE);
xcb_flush(c);
xcb_generic_event_t *e;
while ( (e=xcb_wait_for_event(c)) )