mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-26 10:49:33 +00:00
332 lines
8.0 KiB
C
332 lines
8.0 KiB
C
/* Communication subprocess for GNU Emacs acting as server.
|
|
Copyright (C) 1986, 1987, 1992 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, 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
|
|
#undef signal
|
|
|
|
|
|
#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/types.h>
|
|
#include <sys/file.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/signal.h>
|
|
#include <sys/un.h>
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
|
|
extern int errno;
|
|
|
|
main ()
|
|
{
|
|
char system_name[32];
|
|
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;
|
|
#ifndef SERVER_HOME_DIR
|
|
gethostname (system_name, sizeof (system_name));
|
|
sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name);
|
|
|
|
if (unlink (server.sun_path) == -1 && errno != ENOENT)
|
|
{
|
|
perror ("unlink");
|
|
exit (1);
|
|
}
|
|
#else
|
|
if ((homedir = getenv ("HOME")) == NULL)
|
|
{
|
|
fprintf (stderr,"No home directory\n");
|
|
exit (1);
|
|
}
|
|
strcpy (server.sun_path, homedir);
|
|
strcat (server.sun_path, "/.emacs_server");
|
|
/* Delete anyone else's old server. */
|
|
unlink (server.sun_path);
|
|
#endif
|
|
|
|
if (bind (s, (struct sockaddr *) &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, (struct sockaddr *) &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;
|
|
|
|
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>
|
|
|
|
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 (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. */
|
|
while (1)
|
|
{
|
|
if ((fromlen = msgrcv (s, msgp, BUFSIZ - 1, 1, 0)) < 0)
|
|
{
|
|
perror ("msgrcv");
|
|
exit (1);
|
|
}
|
|
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 */
|