lib-src/emacsclient.c

   1 /* Client process that communicates with GNU Emacs acting as server.
   2    Copyright (C) 1986, 1987, 1994 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 2, 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 char *strerror ();
  56 extern int errno;
  57
  58 main (argc, argv)
  59      int argc;
  60      char **argv;
  61 {
  62   char system_name[32];
  63   int s, i;
  64   FILE *out;
  65   struct sockaddr_un server;
  66   char *homedir, *cwd, *str;
  67   char string[BUFSIZ];
  68
  69   char *getenv (), *getwd ();
  70   int geteuid ();
  71
  72   if (argc < 2)
  73     {
  74       fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
  75       exit (1);
  76     }
  77
  78   /*
  79    * Open up an AF_UNIX socket in this person's home directory
  80    */
  81
  82   if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
  83     {
  84       fprintf (stderr, "%s: ", argv[0]);
  85       perror ("socket");
  86       exit (1);
  87     }
  88   server.sun_family = AF_UNIX;
  89 #ifndef SERVER_HOME_DIR
  90   {
  91     struct stat statbfr;
  92
  93     gethostname (system_name, sizeof (system_name));
  94     sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name);
  95
  96     if (stat (server.sun_path, &statbfr) == -1)
  97       {
  98         if (errno == ENOENT)
  99           fprintf (stderr,
 100                    "Can't find socket; have you started the server?\n");
 101         else
 102           perror ("stat");
 103         exit (1);
 104       }
 105     if (statbfr.st_uid != geteuid())
 106       {
 107         fprintf (stderr, "Illegal socket owner\n");
 108         exit (1);
 109       }
 110   }
 111 #else
 112   if ((homedir = getenv ("HOME")) == NULL)
 113     {
 114       fprintf (stderr, "%s: No home directory\n", argv[0]);
 115       exit (1);
 116     }
 117   strcpy (server.sun_path, homedir);
 118   strcat (server.sun_path, "/.emacs_server");
 119 #endif
 120
 121   if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2)
 122       < 0)
 123     {
 124       fprintf (stderr, "%s: ", argv[0]);
 125       perror ("connect");
 126       exit (1);
 127     }
 128   if ((out = fdopen (s, "r+")) == NULL)
 129     {
 130       fprintf (stderr, "%s: ", argv[0]);
 131       perror ("fdopen");
 132       exit (1);
 133     }
 134
 135   cwd = getwd (string);
 136   if (cwd == 0)
 137     {
 138       /* getwd puts message in STRING if it fails.  */
 139       fprintf (stderr, "%s: %s (%s)\n", argv[0], string, strerror (errno));
 140       exit (1);
 141     }
 142
 143   for (i = 1; i < argc; i++)
 144     {
 145       if (*argv[i] == '+')
 146         {
 147           char *p = argv[i] + 1;
 148           while (*p >= '0' && *p <= '9') p++;
 149           if (*p != 0)
 150             fprintf (out, "%s/", cwd);
 151         }
 152       else if (*argv[i] != '/')
 153         fprintf (out, "%s/", cwd);
 154       fprintf (out, "%s ", argv[i]);
 155     }
 156   fprintf (out, "\n");
 157   fflush (out);
 158
 159   printf ("Waiting for Emacs...");
 160   fflush (stdout);
 161
 162   rewind (out); /* re-read the output */
 163   str = fgets (string, BUFSIZ, out);
 164
 165   /* Now, wait for an answer and print any messages.  */
 166
 167   while (str = fgets (string, BUFSIZ, out))
 168     printf ("%s", str);
 169
 170   exit (0);
 171 }
 172
 173 #else /* This is the SYSV IPC section */
 174
 175 #include <sys/types.h>
 176 #include <sys/ipc.h>
 177 #include <sys/msg.h>
 178 #include <stdio.h>
 179
 180 char *getwd (), *getcwd (), *getenv ();
 181
 182 main (argc, argv)
 183      int argc;
 184      char **argv;
 185 {
 186   int s;
 187   key_t key;
 188   /* Size of text allocated in MSGP.  */
 189   int size_allocated = BUFSIZ;
 190   /* Amount of text used in MSGP.  */
 191   int used;
 192   struct msgbuf *msgp
 193     = (struct msgbuf *) malloc (sizeof (struct msgbuf) + size_allocated);
 194   struct msqid_ds * msg_st;
 195   char *homedir, buf[BUFSIZ];
 196   char gwdirb[BUFSIZ];
 197   char *cwd;
 198   char *temp;
 199
 200   if (argc < 2)
 201     {
 202       fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
 203       exit (1);
 204     }
 205
 206   /*
 207    * Create a message queue using ~/.emacs_server as the path for ftok
 208    */
 209   if ((homedir = getenv ("HOME")) == NULL)
 210     {
 211       fprintf (stderr, "%s: No home directory\n", argv[0]);
 212       exit (1);
 213     }
 214   strcpy (buf, homedir);
 215   strcat (buf, "/.emacs_server");
 216   creat (buf, 0600);
 217   key = ftok (buf, 1);  /* unlikely to be anyone else using it */
 218   s = msgget (key, 0600 | IPC_CREAT);
 219   if (s == -1)
 220     {
 221       fprintf (stderr, "%s: ", argv[0]);
 222       perror ("msgget");
 223       exit (1);
 224     }
 225
 226   /* Determine working dir, so we can prefix it to all the arguments.  */
 227 #ifdef BSD
 228   temp = getwd (gwdirb);
 229 #else
 230   temp = getcwd (gwdirb, sizeof gwdirb);
 231 #endif
 232
 233   cwd = gwdirb;
 234   if (temp != 0)
 235     {
 236       /* On some systems, cwd can look like `@machine/...';
 237          ignore everything before the first slash in such a case.  */
 238       while (*cwd && *cwd != '/')
 239         cwd++;
 240       strcat (cwd, "/");
 241     }
 242   else
 243     {
 244       fprintf (stderr, cwd);
 245       exit (1);
 246     }
 247
 248   msgp->mtext[0] = 0;
 249   used = 0;
 250   argc--; argv++;
 251   while (argc)
 252     {
 253       int need_cwd = 0;
 254       if (*argv[0] == '+')
 255         {
 256           char *p = argv[0] + 1;
 257           while (*p >= '0' && *p <= '9') p++;
 258           if (*p != 0)
 259             need_cwd = 1;
 260         }
 261       else if (*argv[0] != '/')
 262         need_cwd = 1;
 263
 264       if (need_cwd)
 265         used += strlen (cwd);
 266       used += strlen (argv[0]) + 1;
 267       while (used + 2 > size_allocated)
 268         {
 269           size_allocated *= 2;
 270           msgp = (struct msgbuf *) realloc (msgp,
 271                                             (sizeof (struct msgbuf)
 272                                              + size_allocated));
 273         }
 274
 275       if (need_cwd)
 276         strcat (msgp->mtext, cwd);
 277
 278       strcat (msgp->mtext, argv[0]);
 279       strcat (msgp->mtext, " ");
 280       argv++; argc--;
 281     }
 282   strcat (msgp->mtext, "\n");
 283 #ifdef HPUX /* HPUX has a bug.  */
 284   if (strlen (msgp->mtext) >= 512)
 285     {
 286       fprintf (stderr, "emacsclient: args too long for msgsnd\n");
 287       exit (1);
 288     }
 289 #endif
 290   msgp->mtype = 1;
 291   if (msgsnd (s, msgp, strlen (msgp->mtext)+1, 0) < 0)
 292     {
 293       fprintf (stderr, "%s: ", argv[0]);
 294       perror ("msgsnd");
 295       exit (1);
 296     }
 297   /*
 298    * Now, wait for an answer
 299    */
 300   printf ("Waiting for Emacs...");
 301   fflush (stdout);
 302
 303   msgrcv (s, msgp, BUFSIZ, getpid (), 0);       /* wait for anything back */
 304   strcpy (buf, msgp->mtext);
 305
 306   printf ("\n%s\n", buf);
 307   exit (0);
 308 }
 309
 310 #endif /* HAVE_SYSVIPC */
 311
 312 #endif /* HAVE_SOCKETS or HAVE_SYSVIPC */
 313 \f
 314 #ifndef HAVE_STRERROR
 315 char *
 316 strerror (errnum)
 317      int errnum;
 318 {
 319   extern char *sys_errlist[];
 320   extern int sys_nerr;
 321
 322   if (errnum >= 0 && errnum < sys_nerr)
 323     return sys_errlist[errnum];
 324   return (char *) "Unknown error";
 325 }
 326
 327 #endif /* ! HAVE_STRERROR */