mirror of
https://git.savannah.gnu.org/git/emacs.git
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602 lines
14 KiB
C
602 lines
14 KiB
C
/* Communication subprocess for GNU Emacs acting as server.
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Copyright (C) 1986, 1987, 1992, 1994 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* The GNU Emacs edit server process is run as a subprocess of Emacs
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under control of the file lisp/server.el.
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This program accepts communication from client (program emacsclient.c)
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and passes their commands (consisting of keyboard characters)
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up to the Emacs which then executes them. */
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#define NO_SHORTNAMES
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#include <signal.h>
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#include <../src/config.h>
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#undef read
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#undef write
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#undef open
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#undef close
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#undef signal
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#if !defined (HAVE_SOCKETS) && !defined (HAVE_SYSVIPC)
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#include <stdio.h>
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int
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main ()
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{
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fprintf (stderr, "Sorry, the Emacs server is supported only on systems\n");
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fprintf (stderr, "with Berkeley sockets or System V IPC.\n");
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exit (1);
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}
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#else /* HAVE_SOCKETS or HAVE_SYSVIPC */
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void perror_1 ();
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void fatal_error ();
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#if defined (HAVE_SOCKETS) && ! defined (NO_SOCKETS_IN_FILE_SYSTEM)
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/* BSD code is very different from SYSV IPC code */
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#include <sys/types.h>
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#include <sys/file.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/stat.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef STDC_HEADERS
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#include <stdlib.h>
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#endif
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#ifndef errno
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extern int errno;
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#endif
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/* Copied from src/process.c */
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#ifdef FD_SET
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/* We could get this from param.h, but better not to depend on finding that.
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And better not to risk that it might define other symbols used in this
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file. */
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#ifdef FD_SETSIZE
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#define MAXDESC FD_SETSIZE
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#else
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#define MAXDESC 64
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#endif
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#define SELECT_TYPE fd_set
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#else /* no FD_SET */
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#define MAXDESC 32
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#define SELECT_TYPE int
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/* Define the macros to access a single-int bitmap of descriptors. */
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#define FD_SET(n, p) (*(p) |= (1 << (n)))
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#define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
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#define FD_ISSET(n, p) (*(p) & (1 << (n)))
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#define FD_ZERO(p) (*(p) = 0)
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#endif /* no FD_SET */
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/* This is the file name of the socket that we made. */
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char *socket_name;
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/* Name of this program. */
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char *progname;
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/* Handle fatal signals. */
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/* This is the handler. */
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SIGTYPE
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delete_socket (sig)
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int sig;
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{
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signal (sig, SIG_DFL);
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unlink (socket_name);
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kill (getpid (), sig);
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}
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/* Set up to handle all the signals. */
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void
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handle_signals ()
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{
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signal (SIGHUP, delete_socket);
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signal (SIGINT, delete_socket);
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signal (SIGQUIT, delete_socket);
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signal (SIGILL, delete_socket);
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signal (SIGTRAP, delete_socket);
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#ifdef SIGABRT
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signal (SIGABRT, delete_socket);
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#endif
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#ifdef SIGHWE
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signal (SIGHWE, delete_socket);
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#endif
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#ifdef SIGPRE
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signal (SIGPRE, delete_socket);
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#endif
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#ifdef SIGORE
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signal (SIGORE, delete_socket);
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#endif
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#ifdef SIGUME
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signal (SIGUME, delete_socket);
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#endif
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#ifdef SIGDLK
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signal (SIGDLK, delete_socket);
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#endif
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#ifdef SIGCPULIM
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signal (SIGCPULIM, delete_socket);
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#endif
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#ifdef SIGIOT
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/* This is missing on some systems - OS/2, for example. */
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signal (SIGIOT, delete_socket);
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#endif
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#ifdef SIGEMT
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signal (SIGEMT, delete_socket);
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#endif
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signal (SIGFPE, delete_socket);
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#ifdef SIGBUS
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signal (SIGBUS, delete_socket);
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#endif
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signal (SIGSEGV, delete_socket);
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#ifdef SIGSYS
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signal (SIGSYS, delete_socket);
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#endif
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signal (SIGTERM, delete_socket);
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#ifdef SIGXCPU
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signal (SIGXCPU, delete_socket);
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#endif
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#ifdef SIGXFSZ
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signal (SIGXFSZ, delete_socket);
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#endif /* SIGXFSZ */
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#ifdef AIX
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/* 20 is SIGCHLD, 21 is SIGTTIN, 22 is SIGTTOU. */
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signal (SIGXCPU, delete_socket);
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#ifndef _I386
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signal (SIGIOINT, delete_socket);
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#endif
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signal (SIGGRANT, delete_socket);
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signal (SIGRETRACT, delete_socket);
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signal (SIGSOUND, delete_socket);
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signal (SIGMSG, delete_socket);
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#endif /* AIX */
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}
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/* Print error message. `s1' is printf control string, `s2' is arg for it. */
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void
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error (s1, s2)
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char *s1, *s2;
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{
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fprintf (stderr, "%s: ", progname);
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fprintf (stderr, s1, s2);
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fprintf (stderr, "\n");
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}
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/* Print error message and exit. */
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void
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fatal (s1, s2)
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char *s1, *s2;
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{
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error (s1, s2);
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exit (1);
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}
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/* Like malloc but get fatal error if memory is exhausted. */
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long *
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xmalloc (size)
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unsigned int size;
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{
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long *result = (long *) malloc (size);
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if (result == NULL)
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fatal ("virtual memory exhausted", 0);
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return result;
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}
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int
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main (argc, argv)
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int argc;
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char **argv;
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{
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char *system_name;
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int system_name_length;
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int s, infd;
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#ifdef SOCKLEN_TYPE
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SOCKLEN_TYPE fromlen;
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#else
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size_t fromlen;
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#endif
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struct sockaddr_un server, fromunix;
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char *homedir;
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char *str, string[BUFSIZ], code[BUFSIZ];
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FILE *infile;
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FILE **openfiles;
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int openfiles_size;
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struct stat statbuf;
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#ifndef convex
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char *getenv ();
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#endif
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progname = argv[0];
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openfiles_size = 20;
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openfiles = (FILE **) malloc (openfiles_size * sizeof (FILE *));
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if (openfiles == 0)
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abort ();
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/*
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* Open up an AF_UNIX socket in this person's home directory
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*/
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if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
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{
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perror_1 ("socket");
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exit (1);
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}
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server.sun_family = AF_UNIX;
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system_name_length = 32;
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while (1)
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{
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system_name = (char *) xmalloc (system_name_length + 1);
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/* system_name must be null-terminated string. */
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system_name[system_name_length] = '\0';
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if (gethostname (system_name, system_name_length) == 0)
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break;
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free (system_name);
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system_name_length *= 2;
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}
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#ifndef SERVER_HOME_DIR
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sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name);
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if (unlink (server.sun_path) == -1 && errno != ENOENT)
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{
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perror_1 ("unlink");
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exit (1);
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}
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#else
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if ((homedir = getenv ("HOME")) == NULL)
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fatal_error ("No home directory\n");
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strcpy (server.sun_path, homedir);
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strcat (server.sun_path, "/.emacs-server-");
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strcat (server.sun_path, system_name);
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/* Delete anyone else's old server. */
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unlink (server.sun_path);
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#endif
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/* Save the socket name so we can delete it. */
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socket_name = (char *) xmalloc (strlen (server.sun_path) + 1);
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strcpy (socket_name, server.sun_path);
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handle_signals ();
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if (bind (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2) < 0)
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{
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perror_1 ("bind");
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exit (1);
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}
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/* Only this user can send commands to this Emacs. */
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if (stat (server.sun_path, &statbuf) < 0)
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{
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perror_1 ("bind");
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exit (1);
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}
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chmod (server.sun_path, statbuf.st_mode & 0600);
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/*
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* Now, just wait for everything to come in..
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*/
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if (listen (s, 5) < 0)
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{
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perror_1 ("listen");
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exit (1);
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}
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/* Disable sigpipes in case luser kills client... */
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signal (SIGPIPE, SIG_IGN);
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for (;;)
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{
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SELECT_TYPE rmask;
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FD_ZERO (&rmask);
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FD_SET (0, &rmask);
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FD_SET (s, &rmask);
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if (select (s + 1, &rmask, 0, 0, 0) < 0)
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perror_1 ("select");
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if (FD_ISSET (s, &rmask)) /* client sends list of filenames */
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{
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fromlen = sizeof (fromunix);
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fromunix.sun_family = AF_UNIX;
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infd = accept (s, (struct sockaddr *) &fromunix, &fromlen);
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if (infd < 0)
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{
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if (errno == EMFILE || errno == ENFILE)
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fprintf (stderr, "Error: too many clients.\n");
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else
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perror_1 ("accept");
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continue;
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}
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if (infd >= openfiles_size)
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{
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openfiles_size *= 2;
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openfiles = (FILE **) realloc (openfiles,
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openfiles_size * sizeof (FILE *));
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if (openfiles == 0)
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abort ();
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}
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infile = fdopen (infd, "r+"); /* open stream */
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if (infile == NULL)
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{
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fprintf (stderr, "Error: too many clients.\n");
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write (infd, "Too many clients.\n", 18);
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close (infd); /* Prevent descriptor leak.. */
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continue;
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}
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str = fgets (string, BUFSIZ, infile);
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if (str == NULL)
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{
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perror_1 ("fgets");
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close (infd); /* Prevent descriptor leak.. */
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continue;
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}
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openfiles[infd] = infile;
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printf ("Client: %d %s", infd, string);
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/* If what we read did not end in a newline,
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it means there is more. Keep reading from the socket
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and outputting to Emacs, until we get the newline. */
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while (string[strlen (string) - 1] != '\n')
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{
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if (fgets (string, BUFSIZ, infile) == 0)
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break;
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printf ("%s", string);
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}
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fflush (stdout);
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fflush (infile);
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continue;
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}
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else if (FD_ISSET (0, &rmask)) /* emacs sends codeword, fd, and string message */
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{
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/* Read command codeword and fd */
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clearerr (stdin);
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scanf ("%s %d%*c", code, &infd);
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if (ferror (stdin) || feof (stdin))
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fatal_error ("server: error reading from standard input\n");
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/* Transfer text from Emacs to the client, up to a newline. */
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infile = openfiles[infd];
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rewind (infile);
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while (1)
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{
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if (fgets (string, BUFSIZ, stdin) == 0)
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break;
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fprintf (infile, "%s", string);
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if (string[strlen (string) - 1] == '\n')
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break;
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}
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fflush (infile);
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/* If command is close, close connection to client. */
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if (strncmp (code, "Close:", 6) == 0)
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if (infd > 2)
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{
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fclose (infile);
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close (infd);
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}
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continue;
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}
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}
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}
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#else /* This is the SYSV IPC section */
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/msg.h>
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#include <setjmp.h>
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#include <errno.h>
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#include <sys/utsname.h>
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struct utsname system_name;
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#ifndef errno
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extern int errno;
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#endif
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jmp_buf msgenv;
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SIGTYPE
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msgcatch ()
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{
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longjmp (msgenv, 1);
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}
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/* "THIS has to be fixed. Remember, stderr may not exist...-rlk."
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Incorrect. This program runs as an inferior of Emacs.
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Its stderr always exists--rms. */
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#include <stdio.h>
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int
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main ()
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{
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int s, infd, fromlen, ioproc;
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key_t key;
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struct msgbuf * msgp =
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(struct msgbuf *) malloc (sizeof *msgp + BUFSIZ);
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struct msqid_ds msg_st;
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int p;
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char *homedir, *getenv ();
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char string[BUFSIZ];
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FILE *infile;
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/*
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* Create a message queue using ~/.emacs-server as the path for ftok
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*/
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if ((homedir = getenv ("HOME")) == NULL)
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fatal_error ("No home directory\n");
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strcpy (string, homedir);
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#ifndef HAVE_LONG_FILE_NAMES
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/* If file names are short, we can't fit the host name. */
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strcat (string, "/.emacs-server");
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#else
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strcat (string, "/.emacs-server-");
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uname (&system_name);
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strcat (string, system_name.nodename);
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#endif
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creat (string, 0600);
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key = ftok (string, 1); /* unlikely to be anyone else using it */
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s = msgget (key, 0600 | IPC_CREAT);
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if (s == -1)
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{
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perror_1 ("msgget");
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exit (1);
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}
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/* Fork so we can close connection even if parent dies */
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p = fork ();
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if (setjmp (msgenv))
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{
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msgctl (s, IPC_RMID, 0);
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if (p > 0)
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kill (p, SIGKILL);
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exit (0);
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}
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signal (SIGTERM, msgcatch);
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signal (SIGINT, msgcatch);
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signal (SIGHUP, msgcatch);
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if (p > 0)
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{
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/* This is executed in the original process that did the fork above. */
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/* Get pid of Emacs itself. */
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p = getppid ();
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setpgrp (); /* Gnu kills process group on exit */
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while (1)
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{
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/* Is Emacs still alive? */
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if (kill (p, 0) < 0)
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{
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msgctl (s, IPC_RMID, 0);
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exit (0);
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}
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sleep (10);
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}
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}
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/* This is executed in the child made by forking above.
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Call it c1. Make another process, ioproc. */
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ioproc = fork ();
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if (ioproc == 0)
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{
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/* In process ioproc, wait for text from Emacs,
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and send it to the process c1.
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This way, c1 only has to wait for one source of input. */
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while (fgets (msgp->mtext, BUFSIZ, stdin))
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{
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msgp->mtype = 1;
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msgsnd (s, msgp, strlen (msgp->mtext) + 1, 0);
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}
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exit (1);
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}
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/* In the process c1,
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listen for messages from clients and pass them to Emacs. */
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while (1)
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{
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if ((fromlen = msgrcv (s, msgp, BUFSIZ - 1, 1, 0)) < 0)
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{
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#ifdef EINTR
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if (errno == EINTR)
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continue;
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#endif
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perror_1 ("msgrcv");
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exit (1);
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}
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else
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{
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msgctl (s, IPC_STAT, &msg_st);
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/* Distinguish whether the message came from a client, or from
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ioproc. */
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if (msg_st.msg_lspid == ioproc)
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{
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char code[BUFSIZ];
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int inproc;
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/* Message from ioproc: tell a client we are done. */
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msgp->mtext[strlen (msgp->mtext)-1] = 0;
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sscanf (msgp->mtext, "%s %d", code, &inproc);
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msgp->mtype = inproc;
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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 */
|
||
|
||
|
||
/* 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 */
|