Initial revision

1 files changed, 318 insertions, 0 deletions

diff --git a/lib-src/emacsserver.c b/lib-src/emacsserver.c
new file mode 100644
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+/* Communication subprocess for GNU Emacs acting as server.
+   Copyright (C) 1986, 1987 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+/* The GNU Emacs edit server process is run as a subprocess of Emacs
+   under control of the file lisp/server.el.
+   This program accepts communication from client (program emacsclient.c)
+   and passes their commands (consisting of keyboard characters)
+   up to the Emacs which then executes them.  */
+
+#define NO_SHORTNAMES
+#include "../src/config.h"
+#undef read
+#undef write
+#undef open
+#undef close
+
+
+#if !defined(HAVE_SOCKETS) && !defined(HAVE_SYSVIPC)
+#include <stdio.h>
+
+main ()
+{
+  fprintf (stderr, "Sorry, the Emacs server is supported only on systems\n");
+  fprintf (stderr, "with Berkeley sockets or System V IPC.\n");
+  exit (1);
+}
+
+#else /* HAVE_SOCKETS or HAVE_SYSVIPC */
+
+#if ! defined (HAVE_SYSVIPC)
+/* BSD code is very different from SYSV IPC code */
+
+#include <sys/file.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/signal.h>
+#include <sys/un.h>
+#include <stdio.h>
+#include <errno.h>
+
+extern int errno;
+
+main ()
+{
+  int s, infd, fromlen;
+  struct sockaddr_un server, fromunix;
+  char *homedir;
+  char *str, string[BUFSIZ], code[BUFSIZ];
+  FILE *infile;
+  FILE **openfiles;
+  int openfiles_size;
+
+  int geteuid ();
+  char *getenv ();
+
+  openfiles_size = 20;
+  openfiles = (FILE **) malloc (openfiles_size * sizeof (FILE *));
+  if (openfiles == 0)
+    abort ();
+
+  /* 
+   * Open up an AF_UNIX socket in this person's home directory
+   */
+
+  if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
+    {
+      perror ("socket");
+      exit (1);
+    }
+  server.sun_family = AF_UNIX;
+  homedir = getenv ("HOME");
+  if (homedir == NULL)
+    {
+      fprintf (stderr,"No home directory\n");
+      exit (1);
+    }
+  sprintf (server.sun_path, "/tmp/esrv%d", geteuid ());
+
+#if 0
+  strcpy (server.sun_path, homedir);
+  strcat (server.sun_path, "/.emacs_server");
+#endif
+
+  /* Delete anyone else's old server.  */
+  unlink (server.sun_path);
+  if (bind (s, &server, strlen (server.sun_path) + 2) < 0)
+    {
+      perror ("bind");
+      exit (1);
+    }
+  /* Only this user can send commands to this Emacs.  */
+  chmod (server.sun_path, 0600);
+  /*
+   * Now, just wait for everything to come in..
+   */
+  if (listen (s, 5) < 0)
+    {
+      perror ("listen");
+      exit (1);
+    }
+
+  /* Disable sigpipes in case luser kills client... */
+  signal (SIGPIPE, SIG_IGN);
+  for (;;)
+    {
+      int rmask = (1 << s) + 1;
+      if (select (s + 1, &rmask, 0, 0, 0) < 0)
+        perror ("select");
+      if (rmask & (1 << s))     /* client sends list of filenames */
+        {
+          fromlen = sizeof (fromunix);
+          fromunix.sun_family = AF_UNIX;
+          infd = accept (s, &fromunix, &fromlen); /* open socket fd */
+          if (infd < 0)
+            {
+              if (errno == EMFILE || errno == ENFILE)
+                printf ("Too many clients.\n");
+              else
+                perror ("accept");
+              continue;
+            }
+
+          if (infd >= openfiles_size)
+            {
+              openfiles_size *= 2;
+              openfiles = (FILE **) realloc (openfiles,
+                                             openfiles_size * sizeof (FILE *));
+              if (openfiles == 0)
+                abort ();
+            }
+
+          infile = fdopen (infd, "r+"); /* open stream */
+          if (infile == NULL)
+            {
+              printf ("Too many clients.\n");
+              write (infd, "Too many clients.\n", 18);
+              close (infd);             /* Prevent descriptor leak.. */
+              continue;
+            }
+          str = fgets (string, BUFSIZ, infile);
+          if (str == NULL)
+            {
+              perror ("fgets");
+              close (infd);             /* Prevent descriptor leak.. */
+              continue;
+            }
+          openfiles[infd] = infile;
+          printf ("Client: %d %s", infd, string);
+          /* If what we read did not end in a newline,
+             it means there is more.  Keep reading from the socket
+             and outputting to Emacs, until we get the newline.  */
+          while (string[strlen (string) - 1] != '\n')
+            {
+              if (fgets (string, BUFSIZ, infile) == 0)
+                break;
+              printf ("%s", string);
+            }
+          fflush (stdout);
+          fflush (infile);
+          continue;
+        }
+      else if (rmask & 1) /* emacs sends codeword, fd, and string message */
+        {
+          /* Read command codeword and fd */
+          clearerr (stdin);
+          scanf ("%s %d%*c", code, &infd);
+          if (ferror (stdin) || feof (stdin))
+            {
+              fprintf (stderr, "server: error reading from standard input\n");
+              exit (1);
+            }
+
+          /* Transfer text from Emacs to the client, up to a newline.  */
+          infile = openfiles[infd];
+          while (1)
+            {
+              if (fgets (string, BUFSIZ, stdin) == 0)
+                break;
+              fprintf (infile, "%s", string);
+              if (string[strlen (string) - 1] == '\n')
+                break;
+            }
+          fflush (infile);
+
+          /* If command is close, close connection to client.  */
+          if (strncmp (code, "Close:", 6) == 0) 
+            if (infd > 2) 
+              {
+                fclose (infile);
+                close (infd);
+              }
+          continue;
+        } 
+    }
+}
+
+#else  /* This is the SYSV IPC section */
+
+#include <sys/types.h>
+#include <sys/signal.h>
+#include <sys/ipc.h>
+#include <sys/msg.h>
+#include <setjmp.h>
+
+jmp_buf msgenv;
+
+msgcatch ()
+{
+  longjmp (msgenv, 1);
+}
+
+
+/* "THIS has to be fixed.  Remember, stderr may not exist...-rlk."
+   Incorrect.  This program runs as an inferior of Emacs.
+   Its stderr always exists--rms.  */
+#include <stdio.h>
+
+main ()
+{
+  int s, infd, fromlen;
+  key_t key;
+  struct msgbuf * msgp =
+    (struct msgbuf *) malloc (sizeof *msgp + BUFSIZ);
+  struct msqid_ds msg_st;
+  int p;
+  char *homedir, *getenv ();
+  char string[BUFSIZ];
+  FILE *infile;
+
+  /*
+   * Create a message queue using ~/.emacs_server as the path for ftok
+   */
+  if ((homedir = getenv ("HOME")) == NULL)
+    {
+      fprintf (stderr,"No home directory\n");
+      exit (1);
+    }
+  strcpy (string, homedir);
+  strcat (string, "/.emacs_server");
+  creat (string, 0600);
+  key = ftok (string, 1);       /* unlikely to be anyone else using it */
+  s = msgget (key, 0600 | IPC_CREAT);
+  if (s == -1)
+    {
+      perror ("msgget");
+      exit (1);
+    }
+
+  /* Fork so we can close connection even if parent dies */
+  p = fork ();
+  if (setjmp (msgenv))
+    {
+      msgctl (s, IPC_RMID, 0);
+      kill (p, SIGKILL);
+      exit (0);
+    }
+  signal (SIGTERM, msgcatch);
+  signal (SIGINT, msgcatch);
+  /* If parent goes away, remove message box and exit */
+  if (p == 0)
+    {
+      p = getppid ();
+      setpgrp ();               /* Gnu kills process group on exit */
+      while (1)
+        {
+          if (kill (p, 0) < 0)
+            {
+              msgctl (s, IPC_RMID, 0);
+              exit (0);
+            }
+          sleep (10);
+        }
+    }
+
+  while (1)
+    {
+      if ((fromlen = msgrcv (s, msgp, BUFSIZ - 1, 1, 0)) < 0)
+        {
+          perror ("msgrcv");
+        }
+      else
+        {
+          msgctl (s, IPC_STAT, &msg_st);
+          strncpy (string, msgp->mtext, fromlen);
+          string[fromlen] = 0;  /* make sure */
+          /* Newline is part of string.. */
+          printf ("Client: %d %s", s, string); 
+          fflush (stdout);
+          /* Now, wait for a wakeup */
+          fgets (msgp->mtext, BUFSIZ, stdin);
+          msgp->mtext[strlen (msgp->mtext)-1] = 0;
+          /*      strcpy (msgp->mtext, "done");*/
+          msgp->mtype = msg_st.msg_lspid;
+          msgsnd (s, msgp, strlen (msgp->mtext)+1, 0);
+        }
+    }
+}
+
+#endif /* HAVE_SYSVIPC */
+
+#endif /* HAVE_SOCKETS or HAVE_SYSVIPC */