+++ /dev/null
-/* Communication subprocess for GNU Emacs acting as server.
- Copyright (C) 1986, 1987, 1992, 1994, 1999 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 2, 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, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, 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
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <signal.h>
-#undef signal
-
-#if !defined (HAVE_SOCKETS) && !defined (HAVE_SYSVIPC)
-#include <stdio.h>
-
-int
-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 */
-
-void perror_1 ();
-void fatal_error ();
-
-#if defined (HAVE_SOCKETS) && ! defined (NO_SOCKETS_IN_FILE_SYSTEM)
-/* BSD code is very different from SYSV IPC code */
-
-#include <sys/types.h>
-#include <sys/file.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-#include <stdio.h>
-#include <errno.h>
-#include <sys/stat.h>
-
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
-#ifndef errno
-extern int errno;
-#endif
-
-/* Copied from src/process.c */
-#ifdef FD_SET
-/* We could get this from param.h, but better not to depend on finding that.
- And better not to risk that it might define other symbols used in this
- file. */
-#ifdef FD_SETSIZE
-#define MAXDESC FD_SETSIZE
-#else
-#define MAXDESC 64
-#endif
-#define SELECT_TYPE fd_set
-#else /* no FD_SET */
-#define MAXDESC 32
-#define SELECT_TYPE int
-
-/* Define the macros to access a single-int bitmap of descriptors. */
-#define FD_SET(n, p) (*(p) |= (1 << (n)))
-#define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
-#define FD_ISSET(n, p) (*(p) & (1 << (n)))
-#define FD_ZERO(p) (*(p) = 0)
-#endif /* no FD_SET */
-
-/* This is the file name of the socket that we made. */
-
-char *socket_name;
-
-/* Name of this program. */
-
-char *progname;
-\f
-/* Handle fatal signals. */
-
-/* This is the handler. */
-
-SIGTYPE
-delete_socket (sig)
- int sig;
-{
- signal (sig, SIG_DFL);
- unlink (socket_name);
- kill (getpid (), sig);
-}
-
-/* Set up to handle all the signals. */
-
-void
-handle_signals ()
-{
- signal (SIGHUP, delete_socket);
- signal (SIGINT, delete_socket);
- signal (SIGQUIT, delete_socket);
- signal (SIGILL, delete_socket);
- signal (SIGTRAP, delete_socket);
-#ifdef SIGABRT
- signal (SIGABRT, delete_socket);
-#endif
-#ifdef SIGHWE
- signal (SIGHWE, delete_socket);
-#endif
-#ifdef SIGPRE
- signal (SIGPRE, delete_socket);
-#endif
-#ifdef SIGORE
- signal (SIGORE, delete_socket);
-#endif
-#ifdef SIGUME
- signal (SIGUME, delete_socket);
-#endif
-#ifdef SIGDLK
- signal (SIGDLK, delete_socket);
-#endif
-#ifdef SIGCPULIM
- signal (SIGCPULIM, delete_socket);
-#endif
-#ifdef SIGIOT
- /* This is missing on some systems - OS/2, for example. */
- signal (SIGIOT, delete_socket);
-#endif
-#ifdef SIGEMT
- signal (SIGEMT, delete_socket);
-#endif
- signal (SIGFPE, delete_socket);
-#ifdef SIGBUS
- signal (SIGBUS, delete_socket);
-#endif
- signal (SIGSEGV, delete_socket);
-#ifdef SIGSYS
- signal (SIGSYS, delete_socket);
-#endif
- signal (SIGTERM, delete_socket);
-#ifdef SIGXCPU
- signal (SIGXCPU, delete_socket);
-#endif
-#ifdef SIGXFSZ
- signal (SIGXFSZ, delete_socket);
-#endif /* SIGXFSZ */
-
-#ifdef AIX
-/* 20 is SIGCHLD, 21 is SIGTTIN, 22 is SIGTTOU. */
- signal (SIGXCPU, delete_socket);
-#ifndef _I386
- signal (SIGIOINT, delete_socket);
-#endif
- signal (SIGGRANT, delete_socket);
- signal (SIGRETRACT, delete_socket);
- signal (SIGSOUND, delete_socket);
- signal (SIGMSG, delete_socket);
-#endif /* AIX */
-}
-\f
-/* Print error message. `s1' is printf control string, `s2' is arg for it. */
-void
-error (s1, s2)
- char *s1, *s2;
-{
- fprintf (stderr, "%s: ", progname);
- fprintf (stderr, s1, s2);
- fprintf (stderr, "\n");
-}
-
-/* Print error message and exit. */
-void
-fatal (s1, s2)
- char *s1, *s2;
-{
- error (s1, s2);
- exit (1);
-}
-
-/* Like malloc but get fatal error if memory is exhausted. */
-
-long *
-xmalloc (size)
- unsigned int size;
-{
- long *result = (long *) malloc (size);
- if (result == NULL)
- fatal ("virtual memory exhausted", 0);
- return result;
-}
-\f
-int
-main (argc, argv)
- int argc;
- char **argv;
-{
- char *system_name;
- int system_name_length;
- int s, infd;
-#ifdef SOCKLEN_TYPE
- SOCKLEN_TYPE fromlen;
-#else
- size_t fromlen;
-#endif
- struct sockaddr_un server, fromunix;
-#ifdef SERVER_HOME_DIR
- char *homedir;
-#endif
- char *str, string[BUFSIZ], code[BUFSIZ];
- FILE *infile;
- FILE **openfiles;
- int openfiles_size;
- struct stat statbuf;
-
-#ifndef convex
- char *getenv ();
-#endif
-
- progname = argv[0];
-
- 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_1 ("socket");
- exit (1);
- }
- server.sun_family = AF_UNIX;
-
- system_name_length = 32;
- while (1)
- {
- system_name = (char *) xmalloc (system_name_length + 1);
-
- /* system_name must be null-terminated string. */
- system_name[system_name_length] = '\0';
-
- if (gethostname (system_name, system_name_length) == 0)
- break;
-
- free (system_name);
- system_name_length *= 2;
- }
-
-#ifndef SERVER_HOME_DIR
- sprintf (server.sun_path, "/tmp/esrv%d-%s", (int) geteuid (), system_name);
-
- if (unlink (server.sun_path) == -1 && errno != ENOENT)
- {
- perror_1 ("unlink");
- exit (1);
- }
-#else
- if ((homedir = getenv ("HOME")) == NULL)
- fatal_error ("No home directory\n");
-
- strcpy (server.sun_path, homedir);
- strcat (server.sun_path, "/.emacs-server-");
- strcat (server.sun_path, system_name);
- /* Delete anyone else's old server. */
- unlink (server.sun_path);
-#endif
-
- /* Save the socket name so we can delete it. */
- socket_name = (char *) xmalloc (strlen (server.sun_path) + 1);
- strcpy (socket_name, server.sun_path);
-
- handle_signals ();
-
- if (bind (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2) < 0)
- {
- perror_1 ("bind");
- exit (1);
- }
- /* Only this user can send commands to this Emacs. */
- if (stat (server.sun_path, &statbuf) < 0)
- {
- perror_1 ("bind");
- exit (1);
- }
-
- chmod (server.sun_path, statbuf.st_mode & 0600);
- /*
- * Now, just wait for everything to come in..
- */
- if (listen (s, 5) < 0)
- {
- perror_1 ("listen");
- exit (1);
- }
-
- /* Disable sigpipes in case luser kills client... */
- signal (SIGPIPE, SIG_IGN);
- for (;;)
- {
- SELECT_TYPE rmask;
- FD_ZERO (&rmask);
- FD_SET (0, &rmask);
- FD_SET (s, &rmask);
- if (select (s + 1, &rmask, 0, 0, 0) < 0)
- perror_1 ("select");
- if (FD_ISSET (s, &rmask)) /* client sends list of filenames */
- {
- fromlen = sizeof (fromunix);
- fromunix.sun_family = AF_UNIX;
- infd = accept (s, (struct sockaddr *) &fromunix, &fromlen);
- if (infd < 0)
- {
- if (errno == EMFILE || errno == ENFILE)
- fprintf (stderr, "Error: too many clients.\n");
- else
- perror_1 ("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)
- {
- fprintf (stderr, "Error: 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_1 ("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 (FD_ISSET (0, &rmask)) /* 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))
- fatal_error ("server: error reading from standard input\n");
-
- /* Transfer text from Emacs to the client, up to a newline. */
- infile = openfiles[infd];
- rewind (infile);
- 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/ipc.h>
-#include <sys/msg.h>
-#include <setjmp.h>
-#include <errno.h>
-#include <sys/utsname.h>
-
-struct utsname system_name;
-
-#ifndef errno
-extern int errno;
-#endif
-
-jmp_buf msgenv;
-
-SIGTYPE
-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>
-
-int
-main ()
-{
- int s, infd, fromlen, ioproc;
- 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)
- fatal_error ("No home directory\n");
-
- strcpy (string, homedir);
-#ifndef HAVE_LONG_FILE_NAMES
- /* If file names are short, we can't fit the host name. */
- strcat (string, "/.emacs-server");
-#else
- strcat (string, "/.emacs-server-");
- uname (&system_name);
- strcat (string, system_name.nodename);
-#endif
- creat (string, 0600);
- key = ftok (string, 1); /* unlikely to be anyone else using it */
- s = msgget (key, 0600 | IPC_CREAT);
- if (s == -1)
- {
- perror_1 ("msgget");
- exit (1);
- }
-
- /* Fork so we can close connection even if parent dies */
- p = fork ();
- if (setjmp (msgenv))
- {
- msgctl (s, IPC_RMID, 0);
- if (p > 0)
- kill (p, SIGKILL);
- exit (0);
- }
- signal (SIGTERM, msgcatch);
- signal (SIGINT, msgcatch);
- signal (SIGHUP, msgcatch);
- if (p > 0)
- {
- /* This is executed in the original process that did the fork above. */
- /* Get pid of Emacs itself. */
- p = getppid ();
- setpgrp (); /* Gnu kills process group on exit */
- while (1)
- {
- /* Is Emacs still alive? */
- if (kill (p, 0) < 0)
- {
- msgctl (s, IPC_RMID, 0);
- exit (0);
- }
- sleep (10);
- }
- }
-
- /* This is executed in the child made by forking above.
- Call it c1. Make another process, ioproc. */
-
- ioproc = fork ();
- if (ioproc == 0)
- {
- /* In process ioproc, wait for text from Emacs,
- and send it to the process c1.
- This way, c1 only has to wait for one source of input. */
- while (fgets (msgp->mtext, BUFSIZ, stdin))
- {
- msgp->mtype = 1;
- msgsnd (s, msgp, strlen (msgp->mtext) + 1, 0);
- }
- exit (1);
- }
-
- /* In the process c1,
- listen for messages from clients and pass them to Emacs. */
- while (1)
- {
- if ((fromlen = msgrcv (s, msgp, BUFSIZ - 1, 1, 0)) < 0)
- {
-#ifdef EINTR
- if (errno == EINTR)
- continue;
-#endif
- perror_1 ("msgrcv");
- exit (1);
- }
- else
- {
- msgctl (s, IPC_STAT, &msg_st);
-
- /* Distinguish whether the message came from a client, or from
- ioproc. */
- if (msg_st.msg_lspid == ioproc)
- {
- char code[BUFSIZ];
- int inproc;
-
- /* Message from ioproc: tell a client we are done. */
- msgp->mtext[strlen (msgp->mtext)-1] = 0;
- sscanf (msgp->mtext, "%s %d", code, &inproc);
- msgp->mtype = inproc;
- msgsnd (s, msgp, strlen (msgp->mtext) + 1, 0);
- continue;
- }
-
- /* This is a request from a client: copy to stdout
- so that Emacs will get it. Include msg_lspid
- so server.el can tell us where to send the reply. */
- strncpy (string, msgp->mtext, fromlen);
- string[fromlen] = 0; /* make sure */
- /* Newline is part of string.. */
- printf ("Client: %d %s", msg_st.msg_lspid, string);
- fflush (stdout);
- }
- }
-}
-
-#endif /* HAVE_SYSVIPC */
-
-\f
-/* This is like perror but puts `Error: ' at the beginning. */
-
-void
-perror_1 (string)
- char *string;
-{
- char *copy = (char *) malloc (strlen (string) + 8);
- if (copy == 0)
- fatal_error ("Virtual memory exhausted");
-
- strcpy (copy, "Error: ");
- strcat (copy, string);
- perror (copy);
-}
-
-void
-fatal_error (string)
- char *string;
-{
- fprintf (stderr, "%s", "Error: ");
- fprintf (stderr, string);
- exit (1);
-}
-#endif /* HAVE_SOCKETS or HAVE_SYSVIPC */
projects / emacs.git / commitdiff