diff options
Diffstat (limited to 'xnest-plugin/XnestDis.c')
| -rw-r--r-- | xnest-plugin/XnestDis.c | 43 |
1 files changed, 36 insertions, 7 deletions
diff --git a/xnest-plugin/XnestDis.c b/xnest-plugin/XnestDis.c index b93a20f..a53203b 100644 --- a/xnest-plugin/XnestDis.c +++ b/xnest-plugin/XnestDis.c @@ -34,19 +34,47 @@ The Open Group. * Utility functions and global variable to manage display numbers ***********************************************************************/ -/* maximum numbers of concurrent instances */ -#define MAX_PLUGINS 10 +/* maximum numbers of concurrent instances (per machine) */ +#define MAX_PLUGINS 128 -/* start from 5 to avoid possible conflict with multi-display X server */ -#define XNEST_OFFSET 5 +/* start from 80 to avoid possible conflict with multi-display X server + * like SunRay,LTSP, etc.*/ +#define XNEST_OFFSET 80 /* global allowing to know which display numbers are in use */ -static int16 xnest_display_numbers[MAX_PLUGINS]; +static char xnest_display_numbers[MAX_PLUGINS]; void RxpInitXnestDisplayNumbers() { - memset(xnest_display_numbers, 0, sizeof(int16) * MAX_PLUGINS); + memset(xnest_display_numbers, 0, sizeof(char) * MAX_PLUGINS); +} + +static +Bool IsDisplayNumFree(int id) +{ + char fnamebuf[256]; + struct stat sbuf; + int res; + + /* /tmp/.X%d-lock is more or less the official way... */ + sprintf(fnamebuf, "/tmp/.X%d-lock", id); + res = stat(fnamebuf, &sbuf); + if (res == 0) + return False; + + /* ... but then we have to test for the old stuff, too... ;-( */ + sprintf(fnamebuf, "/tmp/.X11-pipe/X%d", id); + res = stat(fnamebuf, &sbuf); + if (res == 0) + return False; + + sprintf(fnamebuf, "/tmp/.X11-unix/X%d", id); + res = stat(fnamebuf, &sbuf); + if (res == 0) + return False; + + return True; } /* function returning first display number available */ @@ -55,7 +83,8 @@ RxpXnestDisplayNumber() { int i; for (i = 0; i < MAX_PLUGINS; i++) - if (xnest_display_numbers[i] == 0) { + if ((xnest_display_numbers[i] == 0) && + IsDisplayNumFree(i + XNEST_OFFSET)) { xnest_display_numbers[i] = 1; return i + XNEST_OFFSET; } |