/* Copyright 1986, 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. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include #include #include #include #include #include #include #ifdef __APPLE__ #include #if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060 #include #endif #endif /* For PRIO_PROCESS and setpriority() */ #if defined(__DragonFly__) || defined(__OpenBSD__) #include #include #endif /* __DragonFly__ || __OpenBSD__ */ #include #ifndef SHELL #define SHELL "sh" #endif const char *bindir = BINDIR; const char * const server_names[] = { #ifdef __APPLE__ "Xquartz Mac OSX Quartz displays.", #else # ifdef __CYGWIN__ "XWin X Server for the Cygwin environment on Microsoft Windows", # else "Xorg Common X server for most displays", # endif #endif "Xvfb Virtual frame buffer", "Xfake kdrive-based virtual frame buffer", "Xnest X server nested in a window on another X server", "Xephyr kdrive-based nested X server", "Xvnc X server accessed over VNC's RFB protocol", "Xdmx Distributed Multi-head X server", NULL}; #ifndef XINITRC #define XINITRC ".xinitrc" #endif char xinitrcbuf[256]; #ifndef XSERVERRC #define XSERVERRC ".xserverrc" #endif char xserverrcbuf[256]; #define TRUE 1 #define FALSE 0 static char *default_server = "X"; static char *default_display = ":0"; /* choose most efficient */ static char *default_client[] = {"xterm", "-geometry", "+1+1", "-n", "login", NULL}; static char *serverargv[100]; static char *clientargv[100]; static char **server = serverargv + 2; /* make sure room for sh .xserverrc args */ static char **client = clientargv + 2; /* make sure room for sh .xinitrc args */ static char *displayNum = NULL; static char *program = NULL; static Display *xd = NULL; /* server connection */ int status; int serverpid = -1; int clientpid = -1; volatile int gotSignal = 0; static void Execute(char **vec); static Bool waitforserver(void); static Bool processTimeout(int timeout, char *string); static int startServer(char *server[]); static int startClient(char *client[]); static int ignorexio(Display *dpy); static void shutdown(void); static void set_environment(void); static void Fatal(const char *fmt, ...); static void Error(const char *fmt, ...); static void Fatalx(const char *fmt, ...); static void Errorx(const char *fmt, ...); static void sigCatch(int sig) { /* On system with POSIX signals, just interrupt the system call */ gotSignal = sig; } static void sigIgnore(int sig) { } static void Execute(char **vec) /* has room from up above */ { execvp(vec[0], vec); if (access(vec[0], R_OK) == 0) { vec--; /* back it up to stuff shell in */ vec[0] = SHELL; execvp(vec[0], vec); } return; } int main(int argc, char *argv[]) { register char **sptr = server; register char **cptr = client; register char **ptr; int pid; int client_given = 0, server_given = 0; int client_args_given = 0, server_args_given = 0; int start_of_client_args, start_of_server_args; struct sigaction sa, si; #ifdef __APPLE__ #if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060 vproc_transaction_t vt; #endif #endif program = *argv++; argc--; /* * copy the client args. */ if (argc == 0 || (**argv != '/' && **argv != '.')) { for (ptr = default_client; *ptr; ) *cptr++ = *ptr++; } else { client_given = 1; } start_of_client_args = (cptr - client); while (argc && strcmp(*argv, "--")) { client_args_given++; *cptr++ = *argv++; argc--; } *cptr = NULL; if (argc) { argv++; argc--; } /* * Copy the server args. */ if (argc == 0 || (**argv != '/' && **argv != '.')) { *sptr++ = default_server; } else { server_given = 1; *sptr++ = *argv++; argc--; } if (argc > 0 && (argv[0][0] == ':' && isdigit(argv[0][1]))) displayNum = *argv; else displayNum = *sptr++ = default_display; start_of_server_args = (sptr - server); while (--argc >= 0) { server_args_given++; *sptr++ = *argv++; } *sptr = NULL; /* * if no client arguments given, check for a startup file and copy * that into the argument list */ if (!client_given) { char *cp; Bool required = False; xinitrcbuf[0] = '\0'; if ((cp = getenv("XINITRC")) != NULL) { snprintf(xinitrcbuf, sizeof(xinitrcbuf), "%s", cp); required = True; } else if ((cp = getenv("HOME")) != NULL) { snprintf(xinitrcbuf, sizeof(xinitrcbuf), "%s/%s", cp, XINITRC); } if (xinitrcbuf[0]) { if (access(xinitrcbuf, F_OK) == 0) { client += start_of_client_args - 1; client[0] = xinitrcbuf; } else if (required) { Error("warning, no client init file \"%s\"", xinitrcbuf); } } } /* * if no server arguments given, check for a startup file and copy * that into the argument list */ if (!server_given) { char *cp; Bool required = False; xserverrcbuf[0] = '\0'; if ((cp = getenv("XSERVERRC")) != NULL) { snprintf(xserverrcbuf, sizeof(xserverrcbuf), "%s", cp); required = True; } else if ((cp = getenv("HOME")) != NULL) { snprintf(xserverrcbuf, sizeof(xserverrcbuf), "%s/%s", cp, XSERVERRC); } if (xserverrcbuf[0]) { if (access(xserverrcbuf, F_OK) == 0) { server += start_of_server_args - 1; server[0] = xserverrcbuf; } else if (required) { Error("warning, no server init file \"%s\"", xserverrcbuf); } } } /* * Start the server and client. */ signal(SIGCHLD, SIG_DFL); /* Insurance */ /* Let those signal interrupt the wait() call in the main loop */ memset(&sa, 0, sizeof sa); sa.sa_handler = sigCatch; sigemptyset(&sa.sa_mask); sa.sa_flags = 0; /* do not set SA_RESTART */ sigaction(SIGTERM, &sa, NULL); sigaction(SIGQUIT, &sa, NULL); sigaction(SIGINT, &sa, NULL); sigaction(SIGHUP, &sa, NULL); sigaction(SIGPIPE, &sa, NULL); memset(&si, 0, sizeof(si)); si.sa_handler = sigIgnore; sigemptyset(&si.sa_mask); si.sa_flags = SA_RESTART; sigaction(SIGALRM, &si, NULL); sigaction(SIGUSR1, &si, NULL); #ifdef __APPLE__ #if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060 vt = vproc_transaction_begin(NULL); #endif #endif if (startServer(server) > 0 && startClient(client) > 0) { pid = -1; while (pid != clientpid && pid != serverpid && gotSignal == 0 ) pid = wait(NULL); } #ifdef __APPLE__ #if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060 vproc_transaction_end(NULL, vt); #endif #endif signal(SIGTERM, SIG_IGN); signal(SIGQUIT, SIG_IGN); signal(SIGINT, SIG_IGN); signal(SIGHUP, SIG_IGN); signal(SIGPIPE, SIG_IGN); shutdown(); if (gotSignal != 0) { Errorx("unexpected signal %d", gotSignal); exit(EXIT_FAILURE); } if (serverpid < 0) Fatalx("server error"); if (clientpid < 0) Fatalx("client error"); exit(EXIT_SUCCESS); } /* * waitforserver - wait for X server to start up */ static Bool waitforserver(void) { int ncycles = 120; /* # of cycles to wait */ int cycles; /* Wait cycle count */ #ifdef __APPLE__ /* For Apple, we don't get signaled by the server when it's ready, so we just * want to sleep now since we're going to sleep later anyways and this allows us * to avoid the awkard, "why is there an error message in the log" questions * from users. */ sleep(2); #endif for (cycles = 0; cycles < ncycles; cycles++) { if ((xd = XOpenDisplay(displayNum))) { return(TRUE); } else { if (!processTimeout(1, "X server to begin accepting connections")) break; } } Errorx("giving up"); return(FALSE); } /* * return TRUE if we timeout waiting for pid to exit, FALSE otherwise. */ static Bool processTimeout(int timeout, char *string) { int i = 0, pidfound = -1; static char *laststring; for (;;) { if ((pidfound = waitpid(serverpid, &status, WNOHANG)) == serverpid) break; if (timeout) { if (i == 0 && string != laststring) fprintf(stderr, "\r\nwaiting for %s ", string); else fprintf(stderr, "."); fflush(stderr); sleep(1); } if (++i > timeout) break; } if (i > 0) fputc('\n', stderr); /* tidy up after message */ laststring = string; return (serverpid != pidfound); } static int startServer(char *server[]) { sigset_t mask, old; const char * const *cpp; sigemptyset(&mask); sigaddset(&mask, SIGUSR1); sigprocmask(SIG_BLOCK, &mask, &old); serverpid = fork(); switch(serverpid) { case 0: /* Unblock */ sigprocmask(SIG_SETMASK, &old, NULL); /* * don't hang on read/write to control tty */ signal(SIGTTIN, SIG_IGN); signal(SIGTTOU, SIG_IGN); /* * ignore SIGUSR1 in child. The server * will notice this and send SIGUSR1 back * at xinit when ready to accept connections */ signal(SIGUSR1, SIG_IGN); /* * prevent server from getting sighup from vhangup() * if client is xterm -L */ setpgid(0,getpid()); Execute(server); Error("unable to run server \"%s\"", server[0]); fprintf(stderr, "Use the -- option, or make sure that %s is in your path and\n", bindir); fprintf(stderr, "that \"%s\" is a program or a link to the right type of server\n", server[0]); fprintf(stderr, "for your display. Possible server names include:\n\n"); for (cpp = server_names; *cpp; cpp++) fprintf(stderr, " %s\n", *cpp); fprintf(stderr, "\n"); exit(EXIT_FAILURE); break; case -1: break; default: /* * don't nice server */ setpriority(PRIO_PROCESS, serverpid, -1); errno = 0; if(! processTimeout(0, "")) { serverpid = -1; break; } /* * kludge to avoid race with TCP, giving server time to * set his socket options before we try to open it, * either use the 15 second timeout, or await SIGUSR1. * * If your machine is substantially slower than 15 seconds, * you can easily adjust this value. */ alarm(15); sigsuspend(&old); alarm(0); sigprocmask(SIG_SETMASK, &old, NULL); if (waitforserver() == 0) { Error("unable to connect to X server"); shutdown(); serverpid = -1; } break; } return(serverpid); } static void setWindowPath(void) { /* setting WINDOWPATH for clients */ Atom prop; Atom actualtype; int actualformat; unsigned long nitems; unsigned long bytes_after; unsigned char *buf; const char *windowpath; char *newwindowpath; unsigned long num; char nums[10]; int numn; size_t len; prop = XInternAtom(xd, "XFree86_VT", False); if (prop == None) { Errorx("Unable to intern XFree86_VT atom"); return; } if (XGetWindowProperty(xd, DefaultRootWindow(xd), prop, 0, 1, False, AnyPropertyType, &actualtype, &actualformat, &nitems, &bytes_after, &buf)) { Errorx("No XFree86_VT property detected on X server, WINDOWPATH won't be set"); return; } if (nitems != 1) { Errorx("XFree86_VT property unexpectedly has %lu items instead of 1", nitems); XFree(buf); return; } switch (actualtype) { case XA_CARDINAL: case XA_INTEGER: case XA_WINDOW: switch (actualformat) { case 8: num = (*(uint8_t *)(void *)buf); break; case 16: num = (*(uint16_t *)(void *)buf); break; case 32: num = (*(uint32_t *)(void *)buf); break; default: Errorx("XFree86_VT property has unexpected format %d", actualformat); XFree(buf); return; } break; default: Errorx("XFree86_VT property has unexpected type %lx", actualtype); XFree(buf); return; } XFree(buf); windowpath = getenv("WINDOWPATH"); numn = snprintf(nums, sizeof(nums), "%lu", num); if (!windowpath) { len = numn + 1; newwindowpath = malloc(len); if (newwindowpath == NULL) return; snprintf(newwindowpath, len, "%s", nums); } else { len = strlen(windowpath) + 1 + numn + 1; newwindowpath = malloc(len); if (newwindowpath == NULL) return; snprintf(newwindowpath, len, "%s:%s", windowpath, nums); } if (setenv("WINDOWPATH", newwindowpath, TRUE) == -1) Error("unable to set WINDOWPATH"); free(newwindowpath); } static int startClient(char *client[]) { clientpid = fork(); if (clientpid == 0) { set_environment(); setWindowPath(); if (setuid(getuid()) == -1) { Error("cannot change uid"); _exit(EXIT_FAILURE); } setpgid(0, getpid()); Execute(client); Error("Unable to run program \"%s\"", client[0]); fprintf(stderr, "Specify a program on the command line or make sure that %s\n", bindir); fprintf(stderr, "is in your path.\n\n"); _exit(EXIT_FAILURE); } else { return clientpid; } } static jmp_buf close_env; static int ignorexio(Display *dpy) { Errorx("connection to X server lost"); longjmp(close_env, 1); /*NOTREACHED*/ return 0; } static void shutdown(void) { /* have kept display opened, so close it now */ if (clientpid > 0) { XSetIOErrorHandler(ignorexio); if (! setjmp(close_env)) { XCloseDisplay(xd); } /* HUP all local clients to allow them to clean up */ if (killpg(clientpid, SIGHUP) < 0 && errno != ESRCH) Error("can't send HUP to process group %d", clientpid); } if (serverpid < 0) return; if (killpg(serverpid, SIGTERM) < 0) { if (errno == ESRCH) return; Fatal("can't kill X server"); } if (!processTimeout(10, "X server to shut down")) return; Errorx("X server slow to shut down, sending KILL signal"); if (killpg(serverpid, SIGKILL) < 0) { if (errno == ESRCH) return; Error("can't SIGKILL X server"); } if (processTimeout(3, "server to die")) Fatalx("X server refuses to die"); } static void set_environment(void) { if (setenv("DISPLAY", displayNum, TRUE) == -1) Fatal("unable to set DISPLAY"); } static void verror(const char *fmt, va_list ap) { fprintf(stderr, "%s: ", program); vfprintf(stderr, fmt, ap); fprintf(stderr, ": %s\n", strerror(errno)); } static void verrorx(const char *fmt, va_list ap) { fprintf(stderr, "%s: ", program); vfprintf(stderr, fmt, ap); fprintf(stderr, "\n"); } static void Fatal(const char *fmt, ...) { va_list ap; va_start(ap, fmt); verror(fmt, ap); va_end(ap); exit(EXIT_FAILURE); } static void Fatalx(const char *fmt, ...) { va_list ap; va_start(ap, fmt); verrorx(fmt, ap); va_end(ap); exit(EXIT_FAILURE); } static void Error(const char *fmt, ...) { va_list ap; va_start(ap, fmt); verror(fmt, ap); va_end(ap); } static void Errorx(const char *fmt, ...) { va_list ap; va_start(ap, fmt); verrorx(fmt, ap); va_end(ap); }