OrdinaryMagician/stuff
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I guess I can just put this up. Most of these have been sitting here forever.

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Marisa the Magician 2017-09-04 11:24:40 +02:00
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/*
schange.c : run command on screen change events from RandR.
(C)2015 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 <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <xcb/xcb.h>
#include <xcb/xcb_event.h>
#include <xcb/randr.h>
xcb_connection_t *c;
xcb_screen_t *s;
char **cmdline;
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 */
int pid = fork();
if ( !pid ) execvp(cmdline[0],cmdline);
else waitpid(pid,0,0);
}
int main( int argc, char **argv )
{
if ( argc < 2 ) return 1;
cmdline = argv+1;
c = xcb_connect(0,0);
s = xcb_setup_roots_iterator(xcb_get_setup(c)).data;
xcb_randr_select_input(c,s->root,XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE);
xcb_flush(c);
xcb_generic_event_t *e;
while ( (e=xcb_wait_for_event(c)) )
{
handle_event(e);
free(e);
}
xcb_disconnect(c);
return 0;
}