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 #ifdef close
  27 #undef close
  28 #endif
  29
  30
  31 #if !defined(HAVE_SOCKETS) && !defined(HAVE_SYSVIPC)
  32 #include <stdio.h>
  33
  34 main (argc, argv)
  35      int argc;
  36      char **argv;
  37 {
  38   fprintf (stderr, "%s: Sorry, the Emacs server is supported only\n",
  39            argv[0]);
  40   fprintf (stderr, "on systems with Berkeley sockets or System V IPC.\n");
  41   exit (1);
  42 }
  43
  44 #else /* HAVE_SOCKETS or HAVE_SYSVIPC */
  45
  46 #if ! defined (HAVE_SYSVIPC)
  47 /* BSD code is very different from SYSV IPC code */
  48
  49 #include <sys/types.h>
  50 #include <sys/socket.h>
  51 #include <sys/un.h>
  52 #include <sys/stat.h>
  53 #include <stdio.h>
  54 #include <errno.h>
  55
  56 extern int sys_nerr;
  57 extern char *sys_errlist[];
  58 extern int errno;
  59
  60 main (argc, argv)
  61      int argc;
  62      char **argv;
  63 {
  64   char system_name[32];
  65   int s, i;
  66   FILE *out;
  67   struct sockaddr_un server;
  68   char *homedir, *cwd, *str;
  69   char string[BUFSIZ];
  70
  71   char *getenv (), *getwd ();
  72   int geteuid ();
  73
  74   if (argc < 2)
  75     {
  76       fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
  77       exit (1);
  78     }
  79
  80   /*
  81    * Open up an AF_UNIX socket in this person's home directory
  82    */
  83
  84   if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
  85     {
  86       fprintf (stderr, "%s: ", argv[0]);
  87       perror ("socket");
  88       exit (1);
  89     }
  90   server.sun_family = AF_UNIX;
  91 #ifndef SERVER_HOME_DIR
  92   {
  93     struct stat statbfr;
  94
  95     gethostname (system_name, sizeof (system_name));
  96     sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name);
  97
  98     if (stat (server.sun_path, &statbfr) == -1)
  99       {
 100         perror ("stat");
 101         exit (1);
 102       }
 103     if (statbfr.st_uid != geteuid())
 104       {
 105         fprintf (stderr, "Illegal socket owner\n");
 106         exit (1);
 107       }
 108   }
 109 #else
 110   if ((homedir = getenv ("HOME")) == NULL)
 111     {
 112       fprintf (stderr, "%s: No home directory\n", argv[0]);
 113       exit (1);
 114     }
 115   strcpy (server.sun_path, homedir);
 116   strcat (server.sun_path, "/.emacs_server");
 117 #endif
 118
 119   if (connect (s, &server, strlen (server.sun_path) + 2) < 0)
 120     {
 121       fprintf (stderr, "%s: ", argv[0]);
 122       perror ("connect");
 123       exit (1);
 124     }
 125   if ((out = fdopen (s, "r+")) == NULL)
 126     {
 127       fprintf (stderr, "%s: ", argv[0]);
 128       perror ("fdopen");
 129       exit (1);
 130     }
 131
 132   cwd = getwd (string);
 133   if (cwd == 0)
 134     {
 135       /* getwd puts message in STRING if it fails.  */
 136       fprintf (stderr, "%s: %s (%s)\n", argv[0], string,
 137                (errno < sys_nerr) ? sys_errlist[errno] : "unknown error");
 138       exit (1);
 139     }
 140
 141   for (i = 1; i < argc; i++)
 142     {
 143       if (*argv[i] == '+')
 144         {
 145           char *p = argv[i] + 1;
 146           while (*p >= '0' && *p <= '9') p++;
 147           if (*p != 0)
 148             fprintf (out, "%s/", cwd);
 149         }
 150       else if (*argv[i] != '/')
 151         fprintf (out, "%s/", cwd);
 152       fprintf (out, "%s ", argv[i]);
 153     }
 154   fprintf (out, "\n");
 155   fflush (out);
 156
 157   printf ("Waiting for Emacs...");
 158   fflush (stdout);
 159
 160   rewind (out); /* re-read the output */
 161   str = fgets (string, BUFSIZ, out);
 162
 163   /* Now, wait for an answer and print any messages.  */
 164
 165   while (str = fgets (string, BUFSIZ, out))
 166     printf ("%s", str);
 167
 168   exit (0);
 169 }
 170
 171 #else /* This is the SYSV IPC section */
 172
 173 #include <sys/types.h>
 174 #include <sys/ipc.h>
 175 #include <sys/msg.h>
 176 #include <stdio.h>
 177
 178 main (argc, argv)
 179      int argc;
 180      char **argv;
 181 {
 182   int s;
 183   key_t key;
 184   struct msgbuf * msgp =
 185       (struct msgbuf *) malloc (sizeof *msgp + BUFSIZ);
 186   struct msqid_ds * msg_st;
 187   char *homedir, buf[BUFSIZ];
 188   char gwdirb[BUFSIZ];
 189   char *cwd;
 190   char *temp;
 191   char *getwd (), *getcwd (), *getenv ();
 192
 193   if (argc < 2)
 194     {
 195       fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
 196       exit (1);
 197     }
 198
 199   /*
 200    * Create a message queue using ~/.emacs_server as the path for ftok
 201    */
 202   if ((homedir = getenv ("HOME")) == NULL)
 203     {
 204       fprintf (stderr, "%s: No home directory\n", argv[0]);
 205       exit (1);
 206     }
 207   strcpy (buf, homedir);
 208   strcat (buf, "/.emacs_server");
 209   creat (buf, 0600);
 210   key = ftok (buf, 1);  /* unlikely to be anyone else using it */
 211   s = msgget (key, 0600);
 212   if (s == -1)
 213     {
 214       fprintf (stderr, "%s: ", argv[0]);
 215       perror ("msgget");
 216       exit (1);
 217     }
 218
 219   /* Determine working dir, so we can prefix it to all the arguments.  */
 220 #ifdef BSD
 221   temp = getwd (gwdirb);
 222 #else
 223   temp = getcwd (gwdirb, sizeof gwdirb);
 224 #endif
 225
 226   cwd = gwdirb;
 227   if (temp != 0)
 228     {
 229       /* On some systems, cwd can look like `@machine/...';
 230          ignore everything before the first slash in such a case.  */
 231       while (*cwd && *cwd != '/')
 232         cwd++;
 233       strcat (cwd, "/");
 234     }
 235   else
 236     {
 237       fprintf (stderr, cwd);
 238       exit (1);
 239     }
 240
 241   msgp->mtext[0] = 0;
 242   argc--; argv++;
 243   while (argc)
 244     {
 245       if (*argv[0] == '+')
 246         {
 247           char *p = argv[0] + 1;
 248           while (*p >= '0' && *p <= '9') p++;
 249           if (*p != 0)
 250             strcat (msgp->mtext, cwd);
 251         }
 252       else if (*argv[0] != '/')
 253         strcat (msgp->mtext, cwd);
 254
 255       strcat (msgp->mtext, argv[0]);
 256       strcat (msgp->mtext, " ");
 257       argv++; argc--;
 258     }
 259   strcat (msgp->mtext, "\n");
 260   msgp->mtype = 1;
 261   if (msgsnd (s, msgp, strlen (msgp->mtext)+1, 0) < 0)
 262     {
 263       fprintf (stderr, "%s: ", argv[0]);
 264       perror ("msgsnd");
 265       exit (1);
 266     }
 267   /*
 268    * Now, wait for an answer
 269    */
 270   printf ("Waiting for Emacs...");
 271   fflush (stdout);
 272
 273   msgrcv (s, msgp, BUFSIZ, getpid (), 0);       /* wait for anything back */
 274   strcpy (buf, msgp->mtext);
 275
 276   printf ("\n%s\n", buf);
 277   exit (0);
 278 }
 279
 280 #endif /* HAVE_SYSVIPC */
 281
 282 #endif /* HAVE_SOCKETS or HAVE_SYSVIPC */