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