lib-src/emacsclient.c

   1 /* Client process that communicates with GNU Emacs acting as server.
   2    Copyright (C) 1986, 1987 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 1, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 #define NO_SHORTNAMES
  22 #include <../src/config.h>
  23 #undef read
  24 #undef write
  25 #undef open
  26 #undef close
  27 #undef signal
  28
  29
  30 #if !defined(HAVE_SOCKETS) && !defined(HAVE_SYSVIPC)
  31 #include <stdio.h>
  32
  33 main (argc, argv)
  34      int argc;
  35      char **argv;
  36 {
  37   fprintf (stderr, "%s: Sorry, the Emacs server is supported only\n",
  38            argv[0]);
  39   fprintf (stderr, "on systems with Berkeley sockets or System V IPC.\n");
  40   exit (1);
  41 }
  42
  43 #else /* HAVE_SOCKETS or HAVE_SYSVIPC */
  44
  45 #if ! defined (HAVE_SYSVIPC)
  46 /* BSD code is very different from SYSV IPC code */
  47
  48 #include <sys/types.h>
  49 #include <sys/socket.h>
  50 #include <sys/un.h>
  51 #include <sys/stat.h>
  52 #include <stdio.h>
  53 #include <errno.h>
  54
  55 extern int sys_nerr;
  56 extern char *sys_errlist[];
  57 extern int errno;
  58
  59 main (argc, argv)
  60      int argc;
  61      char **argv;
  62 {
  63   char system_name[32];
  64   int s, i;
  65   FILE *out;
  66   struct sockaddr_un server;
  67   char *homedir, *cwd, *str;
  68   char string[BUFSIZ];
  69
  70   char *getenv (), *getwd ();
  71   int geteuid ();
  72
  73   if (argc < 2)
  74     {
  75       fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
  76       exit (1);
  77     }
  78
  79   /*
  80    * Open up an AF_UNIX socket in this person's home directory
  81    */
  82
  83   if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
  84     {
  85       fprintf (stderr, "%s: ", argv[0]);
  86       perror ("socket");
  87       exit (1);
  88     }
  89   server.sun_family = AF_UNIX;
  90 #ifndef SERVER_HOME_DIR
  91   {
  92     struct stat statbfr;
  93
  94     gethostname (system_name, sizeof (system_name));
  95     sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name);
  96
  97     if (stat (server.sun_path, &statbfr) == -1)
  98       {
  99         if (errno == ENOENT)
 100           fprintf (stderr,
 101                    "Can't find socket; have you started the server?\n");
 102         else
 103           perror ("stat");
 104         exit (1);
 105       }
 106     if (statbfr.st_uid != geteuid())
 107       {
 108         fprintf (stderr, "Illegal socket owner\n");
 109         exit (1);
 110       }
 111   }
 112 #else
 113   if ((homedir = getenv ("HOME")) == NULL)
 114     {
 115       fprintf (stderr, "%s: No home directory\n", argv[0]);
 116       exit (1);
 117     }
 118   strcpy (server.sun_path, homedir);
 119   strcat (server.sun_path, "/.emacs_server");
 120 #endif
 121
 122   if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2)
 123       < 0)
 124     {
 125       fprintf (stderr, "%s: ", argv[0]);
 126       perror ("connect");
 127       exit (1);
 128     }
 129   if ((out = fdopen (s, "r+")) == NULL)
 130     {
 131       fprintf (stderr, "%s: ", argv[0]);
 132       perror ("fdopen");
 133       exit (1);
 134     }
 135
 136   cwd = getwd (string);
 137   if (cwd == 0)
 138     {
 139       /* getwd puts message in STRING if it fails.  */
 140       fprintf (stderr, "%s: %s (%s)\n", argv[0], string,
 141                (errno < sys_nerr) ? sys_errlist[errno] : "unknown error");
 142       exit (1);
 143     }
 144
 145   for (i = 1; i < argc; i++)
 146     {
 147       if (*argv[i] == '+')
 148         {
 149           char *p = argv[i] + 1;
 150           while (*p >= '0' && *p <= '9') p++;
 151           if (*p != 0)
 152             fprintf (out, "%s/", cwd);
 153         }
 154       else if (*argv[i] != '/')
 155         fprintf (out, "%s/", cwd);
 156       fprintf (out, "%s ", argv[i]);
 157     }
 158   fprintf (out, "\n");
 159   fflush (out);
 160
 161   printf ("Waiting for Emacs...");
 162   fflush (stdout);
 163
 164   rewind (out); /* re-read the output */
 165   str = fgets (string, BUFSIZ, out);
 166
 167   /* Now, wait for an answer and print any messages.  */
 168
 169   while (str = fgets (string, BUFSIZ, out))
 170     printf ("%s", str);
 171
 172   exit (0);
 173 }
 174
 175 #else /* This is the SYSV IPC section */
 176
 177 #include <sys/types.h>
 178 #include <sys/ipc.h>
 179 #include <sys/msg.h>
 180 #include <stdio.h>
 181
 182 main (argc, argv)
 183      int argc;
 184      char **argv;
 185 {
 186   int s;
 187   key_t key;
 188   struct msgbuf * msgp =
 189       (struct msgbuf *) malloc (sizeof *msgp + BUFSIZ);
 190   struct msqid_ds * msg_st;
 191   char *homedir, buf[BUFSIZ];
 192   char gwdirb[BUFSIZ];
 193   char *cwd;
 194   char *temp;
 195   char *getwd (), *getcwd (), *getenv ();
 196
 197   if (argc < 2)
 198     {
 199       fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
 200       exit (1);
 201     }
 202
 203   /*
 204    * Create a message queue using ~/.emacs_server as the path for ftok
 205    */
 206   if ((homedir = getenv ("HOME")) == NULL)
 207     {
 208       fprintf (stderr, "%s: No home directory\n", argv[0]);
 209       exit (1);
 210     }
 211   strcpy (buf, homedir);
 212   strcat (buf, "/.emacs_server");
 213   creat (buf, 0600);
 214   key = ftok (buf, 1);  /* unlikely to be anyone else using it */
 215   s = msgget (key, 0600 | IPC_CREAT);
 216   if (s == -1)
 217     {
 218       fprintf (stderr, "%s: ", argv[0]);
 219       perror ("msgget");
 220       exit (1);
 221     }
 222
 223   /* Determine working dir, so we can prefix it to all the arguments.  */
 224 #ifdef BSD
 225   temp = getwd (gwdirb);
 226 #else
 227   temp = getcwd (gwdirb, sizeof gwdirb);
 228 #endif
 229
 230   cwd = gwdirb;
 231   if (temp != 0)
 232     {
 233       /* On some systems, cwd can look like `@machine/...';
 234          ignore everything before the first slash in such a case.  */
 235       while (*cwd && *cwd != '/')
 236         cwd++;
 237       strcat (cwd, "/");
 238     }
 239   else
 240     {
 241       fprintf (stderr, cwd);
 242       exit (1);
 243     }
 244
 245   msgp->mtext[0] = 0;
 246   argc--; argv++;
 247   while (argc)
 248     {
 249       if (*argv[0] == '+')
 250         {
 251           char *p = argv[0] + 1;
 252           while (*p >= '0' && *p <= '9') p++;
 253           if (*p != 0)
 254             strcat (msgp->mtext, cwd);
 255         }
 256       else if (*argv[0] != '/')
 257         strcat (msgp->mtext, cwd);
 258
 259       strcat (msgp->mtext, argv[0]);
 260       strcat (msgp->mtext, " ");
 261       argv++; argc--;
 262     }
 263   strcat (msgp->mtext, "\n");
 264   msgp->mtype = 1;
 265   if (msgsnd (s, msgp, strlen (msgp->mtext)+1, 0) < 0)
 266     {
 267       fprintf (stderr, "%s: ", argv[0]);
 268       perror ("msgsnd");
 269       exit (1);
 270     }
 271   /*
 272    * Now, wait for an answer
 273    */
 274   printf ("Waiting for Emacs...");
 275   fflush (stdout);
 276
 277   msgrcv (s, msgp, BUFSIZ, getpid (), 0);       /* wait for anything back */
 278   strcpy (buf, msgp->mtext);
 279
 280   printf ("\n%s\n", buf);
 281   exit (0);
 282 }
 283
 284 #endif /* HAVE_SYSVIPC */
 285
 286 #endif /* HAVE_SOCKETS or HAVE_SYSVIPC */