/* $Xorg: lock.c,v 1.4 2001/02/09 02:05:59 xorgcvs Exp $ */ /****************************************************************************** Copyright 1994, 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 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 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: xc/programs/xsm/lock.c,v 3.4 2001/12/14 20:02:25 dawes Exp $ */ #include "xsm.h" #include "lock.h" #include "choose.h" #include <sys/types.h> static const char * GetPath(void) { const char *path = getenv ("SM_SAVE_DIR"); if (!path) { path = getenv ("HOME"); if (!path) path = "."; } return (path); } Status LockSession(const char *session_name, Bool write_id) { const char *path; char lock_file[PATH_MAX]; char temp_lock_file[PATH_MAX]; Status status; int fd; path = GetPath (); snprintf (lock_file, sizeof(lock_file), "%s/.XSMlock-%s", path, session_name); snprintf (temp_lock_file, sizeof(temp_lock_file), "%s/.XSMtlock-%s", path, session_name); if ((fd = creat (temp_lock_file, 0444)) < 0) return (0); if ((write_id && (write (fd, networkIds, strlen (networkIds)) != strlen (networkIds))) || (write (fd, "\n", 1) != 1)) { close (fd); return (0); } close (fd); status = 1; if (link (temp_lock_file, lock_file) < 0) status = 0; if (remove (temp_lock_file) < 0) status = 0; return (status); } void UnlockSession(const char *session_name) { const char *path; char lock_file[PATH_MAX]; path = GetPath (); snprintf (lock_file, sizeof(lock_file), "%s/.XSMlock-%s", path, session_name); remove (lock_file); } char * GetLockId(const char *session_name) { const char *path; FILE *fp; char lock_file[PATH_MAX]; char buf[256]; char *ret; path = GetPath (); snprintf (lock_file, sizeof(lock_file), "%s/.XSMlock-%s", path, session_name); if ((fp = fopen (lock_file, "r")) == NULL) { return (NULL); } fcntl(fileno(fp), F_SETFD, FD_CLOEXEC); buf[0] = '\0'; fscanf (fp, "%255s\n", buf); ret = XtNewString (buf); fclose (fp); return (ret); } Bool CheckSessionLocked(const char *session_name, Bool get_id, char **id_ret) { if (get_id) *id_ret = GetLockId (session_name); if (!LockSession (session_name, False)) return (1); UnlockSession (session_name); return (0); } void UnableToLockSession(const char *session_name) { /* * We should popup a dialog here giving error. */ #ifdef XKB XkbStdBell(XtDisplay(topLevel),XtWindow(topLevel),0,XkbBI_Failure); #else XBell (XtDisplay (topLevel), 0); #endif sleep (2); ChooseSession (); }