/* $Xorg: XnestDis.c,v 1.4 2001/02/09 02:05:58 xorgcvs Exp $ */ /* Copyright 1996, 1998 The Open Group Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL- ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABIL- ITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The Open Group. */ /* $XFree86$ */ #include "RxPlugin.h" #include <sys/stat.h> /*********************************************************************** * Utility functions and global variable to manage display numbers ***********************************************************************/ /* maximum numbers of concurrent instances (per machine) */ #define MAX_PLUGINS 128 /* 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 char xnest_display_numbers[MAX_PLUGINS]; void RxpInitXnestDisplayNumbers() { 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 */ int RxpXnestDisplayNumber() { int i; for (i = 0; i < MAX_PLUGINS; i++) if ((xnest_display_numbers[i] == 0) && IsDisplayNumFree(i + XNEST_OFFSET)) { xnest_display_numbers[i] = 1; return i + XNEST_OFFSET; } /* no more available */ return -1; } /* function returning first display number available */ void RxpFreeXnestDisplayNumber(int i) { xnest_display_numbers[i - XNEST_OFFSET] = 0; } /* function returning display name with specified display number */ char * RxpXnestDisplay(int display_number) { static char name[1024]; char *display_name, *dpy_name, *display_num, *screen_num; display_name = getenv("DISPLAY"); if (display_name == NULL) return NULL; /* if of the form x11:display skip scheme part */ if (strncmp(display_name, "x11:", 4) == 0) dpy_name = display_name + 4; else dpy_name = display_name; /* Check for RFC 2732 bracketed IPv6 numeric address */ if (*dpy_name == '[') { while (*dpy_name && (*dpy_name != ']')) { dpy_name++; } } /* display number is after next ":" character */ display_num = strchr(dpy_name, ':'); if (display_num == NULL) /* invalid display specification */ return NULL; /* copy display name up to the display number */ strncpy(name, display_name, display_num - display_name); /* override display_number */ sprintf(name + (display_num - display_name), ":%d", display_number); /* append screen number */ screen_num = strchr(display_num, '.'); if (screen_num != NULL) strcat(name, screen_num); return name; }