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 int
  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, "Invalid 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   gethostname (system_name, sizeof (system_name));
 121   strcat (server.sun_path, system_name);
 122 #endif
 123
 124   if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2)
 125       < 0)
 126     {
 127       fprintf (stderr, "%s: ", argv[0]);
 128       perror ("connect");
 129       exit (1);
 130     }
 131   if ((out = fdopen (s, "r+")) == NULL)
 132     {
 133       fprintf (stderr, "%s: ", argv[0]);
 134       perror ("fdopen");
 135       exit (1);
 136     }
 137
 138   cwd = getwd (string);
 139   if (cwd == 0)
 140     {
 141       /* getwd puts message in STRING if it fails.  */
 142       fprintf (stderr, "%s: %s (%s)\n", argv[0], string, strerror (errno));
 143       exit (1);
 144     }
 145
 146   for (i = 1; i < argc; i++)
 147     {
 148       if (*argv[i] == '+')
 149         {
 150           char *p = argv[i] + 1;
 151           while (*p >= '0' && *p <= '9') p++;
 152           if (*p != 0)
 153             fprintf (out, "%s/", cwd);
 154         }
 155       else if (*argv[i] != '/')
 156         fprintf (out, "%s/", cwd);
 157       fprintf (out, "%s ", argv[i]);
 158     }
 159   fprintf (out, "\n");
 160   fflush (out);
 161
 162   printf ("Waiting for Emacs...");
 163   fflush (stdout);
 164
 165   rewind (out); /* re-read the output */
 166   str = fgets (string, BUFSIZ, out);
 167
 168   /* Now, wait for an answer and print any messages.  */
 169
 170   while (str = fgets (string, BUFSIZ, out))
 171     printf ("%s", str);
 172
 173   return 0;
 174 }
 175
 176 #else /* This is the SYSV IPC section */
 177
 178 #include <sys/types.h>
 179 #include <sys/ipc.h>
 180 #include <sys/msg.h>
 181 #include <sys/utsname.h>
 182 #include <stdio.h>
 183
 184 char *getwd (), *getcwd (), *getenv ();
 185 struct utsname system_name;
 186
 187 main (argc, argv)
 188      int argc;
 189      char **argv;
 190 {
 191   int s;
 192   key_t key;
 193   /* Size of text allocated in MSGP.  */
 194   int size_allocated = BUFSIZ;
 195   /* Amount of text used in MSGP.  */
 196   int used;
 197   struct msgbuf *msgp
 198     = (struct msgbuf *) malloc (sizeof (struct msgbuf) + size_allocated);
 199   struct msqid_ds * msg_st;
 200   char *homedir, buf[BUFSIZ];
 201   char gwdirb[BUFSIZ];
 202   char *cwd;
 203   char *temp;
 204   char *progname = argv[0];
 205
 206   if (argc < 2)
 207     {
 208       fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
 209       exit (1);
 210     }
 211
 212   /*
 213    * Create a message queue using ~/.emacs-server as the path for ftok
 214    */
 215   if ((homedir = getenv ("HOME")) == NULL)
 216     {
 217       fprintf (stderr, "%s: No home directory\n", argv[0]);
 218       exit (1);
 219     }
 220   strcpy (buf, homedir);
 221 #ifndef HAVE_LONG_FILE_NAMES
 222   /* If file names are short, we can't fit the host name.  */
 223   strcat (buf, "/.emacs-server");
 224 #else
 225   strcat (buf, "/.emacs-server-");
 226   uname (&system_name);
 227   strcat (buf, system_name.nodename);
 228 #endif
 229   creat (buf, 0600);
 230   key = ftok (buf, 1);  /* unlikely to be anyone else using it */
 231   s = msgget (key, 0600 | IPC_CREAT);
 232   if (s == -1)
 233     {
 234       fprintf (stderr, "%s: ", argv[0]);
 235       perror ("msgget");
 236       exit (1);
 237     }
 238
 239   /* Determine working dir, so we can prefix it to all the arguments.  */
 240 #ifdef BSD
 241   temp = getwd (gwdirb);
 242 #else
 243   temp = getcwd (gwdirb, sizeof gwdirb);
 244 #endif
 245
 246   cwd = gwdirb;
 247   if (temp != 0)
 248     {
 249       /* On some systems, cwd can look like `@machine/...';
 250          ignore everything before the first slash in such a case.  */
 251       while (*cwd && *cwd != '/')
 252         cwd++;
 253       strcat (cwd, "/");
 254     }
 255   else
 256     {
 257       fprintf (stderr, cwd);
 258       exit (1);
 259     }
 260
 261   msgp->mtext[0] = 0;
 262   used = 0;
 263   argc--; argv++;
 264   while (argc)
 265     {
 266       int need_cwd = 0;
 267       char *modified_arg = argv[0];
 268       if (*modified_arg == '+')
 269         {
 270           char *p = modified_arg + 1;
 271           while (*p >= '0' && *p <= '9') p++;
 272           if (*p != 0)
 273             need_cwd = 1;
 274         }
 275       else if (*modified_arg != '/')
 276         need_cwd = 1;
 277
 278       if (need_cwd)
 279         used += strlen (cwd);
 280       used += strlen (modified_arg) + 1;
 281       while (used + 2 > size_allocated)
 282         {
 283           size_allocated *= 2;
 284           msgp = (struct msgbuf *) realloc (msgp,
 285                                             (sizeof (struct msgbuf)
 286                                              + size_allocated));
 287         }
 288
 289       if (need_cwd)
 290         strcat (msgp->mtext, cwd);
 291
 292       strcat (msgp->mtext, modified_arg);
 293       strcat (msgp->mtext, " ");
 294       argv++; argc--;
 295     }
 296   strcat (msgp->mtext, "\n");
 297 #ifdef HPUX /* HPUX has a bug.  */
 298   if (strlen (msgp->mtext) >= 512)
 299     {
 300       fprintf (stderr, "emacsclient: args too long for msgsnd\n");
 301       exit (1);
 302     }
 303 #endif
 304   msgp->mtype = 1;
 305   if (msgsnd (s, msgp, strlen (msgp->mtext)+1, 0) < 0)
 306     {
 307       fprintf (stderr, "%s: ", progname);
 308       perror ("msgsnd");
 309       exit (1);
 310     }
 311   /*
 312    * Now, wait for an answer
 313    */
 314   printf ("Waiting for Emacs...");
 315   fflush (stdout);
 316
 317   msgrcv (s, msgp, BUFSIZ, getpid (), 0);       /* wait for anything back */
 318   strcpy (buf, msgp->mtext);
 319
 320   printf ("\n%s\n", buf);
 321   exit (0);
 322 }
 323
 324 #endif /* HAVE_SYSVIPC */
 325
 326 #endif /* HAVE_SOCKETS or HAVE_SYSVIPC */
 327 \f
 328 #ifndef HAVE_STRERROR
 329 char *
 330 strerror (errnum)
 331      int errnum;
 332 {
 333   extern char *sys_errlist[];
 334   extern int sys_nerr;
 335
 336   if (errnum >= 0 && errnum < sys_nerr)
 337     return sys_errlist[errnum];
 338   return (char *) "Unknown error";
 339 }
 340
 341 #endif /* ! HAVE_STRERROR */