mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-02 08:22:22 +00:00
600 lines
14 KiB
C
600 lines
14 KiB
C
/* 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;
|
||
|
||
/* 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 */
|
||
}
|
||
|
||
/* 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;
|
||
}
|
||
|
||
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 */
|
||
|
||
|
||
/* 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 */
|