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 <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   gethostname (system_name, sizeof (system_name));
  92   sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name);
  93
  94   if (stat (server.sun_path, &statbfr) == -1)
  95     {
  96       perror ("stat");
  97       exit (1);
  98     }
  99   if (statbfr.st_uid != geteuid())
 100     {
 101       fprintf (stderr, "Illegal socket owner\n");
 102       exit (1);
 103     }
 104 #else
 105   if ((homedir = getenv ("HOME")) == NULL)
 106     {
 107       fprintf (stderr, "%s: No home directory\n", argv[0]);
 108       exit (1);
 109     }
 110   strcpy (server.sun_path, homedir);
 111   strcat (server.sun_path, "/.emacs_server");
 112 #endif
 113
 114   if (connect (s, &server, strlen (server.sun_path) + 2) < 0)
 115     {
 116       fprintf (stderr, "%s: ", argv[0]);
 117       perror ("connect");
 118       exit (1);
 119     }
 120   if ((out = fdopen (s, "r+")) == NULL)
 121     {
 122       fprintf (stderr, "%s: ", argv[0]);
 123       perror ("fdopen");
 124       exit (1);
 125     }
 126
 127   cwd = getwd (string);
 128   if (cwd == 0)
 129     {
 130       /* getwd puts message in STRING if it fails.  */
 131       fprintf (stderr, "%s: %s (%s)\n", argv[0], string,
 132                (errno < sys_nerr) ? sys_errlist[errno] : "unknown error");
 133       exit (1);
 134     }
 135
 136   for (i = 1; i < argc; i++)
 137     {
 138       if (*argv[i] == '+')
 139         {
 140           char *p = argv[i] + 1;
 141           while (*p >= '0' && *p <= '9') p++;
 142           if (*p != 0)
 143             fprintf (out, "%s/", cwd);
 144         }
 145       else if (*argv[i] != '/')
 146         fprintf (out, "%s/", cwd);
 147       fprintf (out, "%s ", argv[i]);
 148     }
 149   fprintf (out, "\n");
 150   fflush (out);
 151
 152   printf ("Waiting for Emacs...");
 153   fflush (stdout);
 154
 155   rewind (out); /* re-read the output */
 156   str = fgets (string, BUFSIZ, out);
 157
 158   /* Now, wait for an answer and print any messages.  */
 159
 160   while (str = fgets (string, BUFSIZ, out))
 161     printf ("%s", str);
 162
 163   exit (0);
 164 }
 165
 166 #else /* This is the SYSV IPC section */
 167
 168 #include <sys/types.h>
 169 #include <sys/ipc.h>
 170 #include <sys/msg.h>
 171 #include <stdio.h>
 172
 173 main (argc, argv)
 174      int argc;
 175      char **argv;
 176 {
 177   int s;
 178   key_t key;
 179   struct msgbuf * msgp =
 180       (struct msgbuf *) malloc (sizeof *msgp + BUFSIZ);
 181   struct msqid_ds * msg_st;
 182   char *homedir, buf[BUFSIZ];
 183   char gwdirb[BUFSIZ];
 184   char *cwd;
 185   char *temp;
 186   char *getwd (), *getcwd (), *getenv ();
 187
 188   if (argc < 2)
 189     {
 190       fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
 191       exit (1);
 192     }
 193
 194   /*
 195    * Create a message queue using ~/.emacs_server as the path for ftok
 196    */
 197   if ((homedir = getenv ("HOME")) == NULL)
 198     {
 199       fprintf (stderr, "%s: No home directory\n", argv[0]);
 200       exit (1);
 201     }
 202   strcpy (buf, homedir);
 203   strcat (buf, "/.emacs_server");
 204   creat (buf, 0600);
 205   key = ftok (buf, 1);  /* unlikely to be anyone else using it */
 206   s = msgget (key, 0600);
 207   if (s == -1)
 208     {
 209       fprintf (stderr, "%s: ", argv[0]);
 210       perror ("msgget");
 211       exit (1);
 212     }
 213
 214   /* Determine working dir, so we can prefix it to all the arguments.  */
 215 #ifdef BSD
 216   temp = getwd (gwdirb);
 217 #else
 218   temp = getcwd (gwdirb, sizeof gwdirb);
 219 #endif
 220
 221   cwd = gwdirb;
 222   if (temp != 0)
 223     {
 224       /* On some systems, cwd can look like `@machine/...';
 225          ignore everything before the first slash in such a case.  */
 226       while (*cwd && *cwd != '/')
 227         cwd++;
 228       strcat (cwd, "/");
 229     }
 230   else
 231     {
 232       fprintf (stderr, cwd);
 233       exit (1);
 234     }
 235
 236   msgp->mtext[0] = 0;
 237   argc--; argv++;
 238   while (argc)
 239     {
 240       if (*argv[0] == '+')
 241         {
 242           char *p = argv[0] + 1;
 243           while (*p >= '0' && *p <= '9') p++;
 244           if (*p != 0)
 245             strcat (msgp->mtext, cwd);
 246         }
 247       else if (*argv[0] != '/')
 248         strcat (msgp->mtext, cwd);
 249
 250       strcat (msgp->mtext, argv[0]);
 251       strcat (msgp->mtext, " ");
 252       argv++; argc--;
 253     }
 254   strcat (msgp->mtext, "\n");
 255   msgp->mtype = 1;
 256   if (msgsnd (s, msgp, strlen (msgp->mtext)+1, 0) < 0)
 257     {
 258       fprintf (stderr, "%s: ", argv[0]);
 259       perror ("msgsnd");
 260       exit (1);
 261     }
 262   /*
 263    * Now, wait for an answer
 264    */
 265   printf ("Waiting for Emacs...");
 266   fflush (stdout);
 267
 268   msgrcv (s, msgp, BUFSIZ, getpid (), 0);       /* wait for anything back */
 269   strcpy (buf, msgp->mtext);
 270
 271   printf ("\n%s\n", buf);
 272   exit (0);
 273 }
 274
 275 #endif /* HAVE_SYSVIPC */
 276
 277 #endif /* HAVE_SOCKETS or HAVE_SYSVIPC */