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- /* -*-C-*-
- Common library code for the GNU Emacs server and client.
-
- This file is part of GNU Emacs.
-
- Copying is permitted under those conditions described by the GNU
- General Public License.
-
- Copyright (C) 1989 Free Software Foundation, Inc.
-
- Author: Andy Norman (ange@hplb.hpl.hp.com), based on
- 'etc/server.c' and 'etc/emacsclient.c' from the 18.52 GNU
- Emacs distribution.
-
- Please mail bugs and suggestions to the author at the above address.
- */
-
- static char rcsid [] = "$Header: gnuslib.c,v 1.6 89/09/28 12:47:34 ange Exp $";
-
- #include "gnuserv.h"
-
- char *progname = NULL;
-
- #ifdef SYSV_IPC
- /*
- connect_to_ipc_server -- establish connection with server process via SYSV IPC
- Returns msqid for server if successful.
- */
- int connect_to_ipc_server()
- {
- int s; /* connected msqid */
- key_t key; /* message key */
- char buf[BUFSIZ]; /* buffer for filename */
-
- sprintf(buf,"/tmp/gsrv%d",geteuid());
- creat(buf,0600);
- key = ftok(buf,1);
-
- if ((s = msgget(key,0600)) == -1) {
- perror(progname);
- fprintf(stderr,"%s: unable to access msg queue\n",progname);
- exit(1);
- }; /* if */
-
- return(s);
-
- } /* connect_to_ipc_server */
-
-
- /*
- disconnect_from_ipc_server -- inform the server that sending has finished,
- and wait for its reply.
- */
- void disconnect_from_ipc_server(s,msgp,echo)
- int s;
- struct msgbuf *msgp;
- int echo;
- {
- int len; /* length of received message */
-
- send_string(s,"\n"); /* newline terminates this message */
- msgp->mtype = 1;
-
- if(msgsnd(s,msgp,strlen(msgp->mtext)+1,0) < 0) {
- perror(progname);
- fprintf(stderr,"%s: unable to send message to server\n",progname);
- exit(1);
- }; /* if */
-
- if((len = msgrcv(s,msgp,BUFSIZ,getpid(),0)) < 0) {
- perror(progname);
- fprintf(stderr,"%s: unable to receive message from server\n",progname);
- exit(1);
- }; /* if */
-
- if (echo) {
- msgp->mtext[len] = '\0'; /* string terminate message */
- printf("%s\n",msgp->mtext);
- }; /* if */
-
- } /* disconnect_from_ipc_server */
- #endif SYSV_IPC
-
-
- #if defined(INTERNET_DOMAIN_SOCKETS) || defined(UNIX_DOMAIN_SOCKETS)
- /*
- send_string -- send string to socket.
- */
- void send_string(s,msg)
- int s;
- char *msg;
- {
- if (send(s,msg,strlen(msg),0) < 0) {
- perror(progname);
- fprintf(stderr,"%s: unable to send\n",progname);
- exit(1);
- }; /* if */
-
- } /* send_string */
- #endif /* INTERNET_DOMAIN_SOCKETS || UNIX_DOMAIN_SOCKETS */
-
-
- #ifdef UNIX_DOMAIN_SOCKETS
- /*
- connect_to_unix_server -- establish connection with server process via a unix-
- domain socket. Returns socket descriptor for server
- if successful.
- */
- int connect_to_unix_server()
- {
- int s; /* connected socket descriptor */
- struct sockaddr_un server; /* for unix connections */
-
- if ((s = socket(AF_UNIX,SOCK_STREAM,0)) < 0) {
- perror(progname);
- fprintf(stderr,"%s: unable to create socket\n",progname);
- exit(1);
- }; /* if */
-
- server.sun_family = AF_UNIX;
- sprintf(server.sun_path,"/tmp/gsrv%d",geteuid());
-
- if (connect(s,&server,strlen(server.sun_path)+2) < 0) {
- perror(progname);
- fprintf(stderr,"%s: unable to connect to local\n",progname);
- exit(1);
- }; /* if */
-
- return(s);
-
- } /* connect_to_unix_server */
- #endif /* UNIX_DOMAIN_SOCKETS */
-
-
- #ifdef INTERNET_DOMAIN_SOCKETS
- /*
- internet_addr -- return the internet addr of the hostname or
- internet address passed. Return -1 on error.
- */
- u_long internet_addr(host)
- char *host;
- {
- struct hostent *hp; /* pointer to host info for remote host */
- u_long host_addr; /* host address */
-
- if ((host_addr = inet_addr(host)) != -1)
- return host_addr;
- else if ((hp = gethostbyname(host)) != NULL)
- return ((struct in_addr *)(hp->h_addr))->s_addr;
- else
- return -1;
-
- } /* internet_addr */
-
-
- /*
- connect_to_internet_server -- establish connection with server process via
- an internet domain socket. Returns socket
- descriptor for server if successful.
- */
- int connect_to_internet_server(serverhost,port)
- char *serverhost;
- u_short port;
- {
- int s; /* connected socket descriptor */
- struct servent *sp; /* pointer to service information */
- struct sockaddr_in peeraddr_in; /* for peer socket address */
-
- /* clear out address structures */
- bzero((char *)&peeraddr_in,sizeof(struct sockaddr_in));
-
- /* Set up the peer address to which we will connect. */
- peeraddr_in.sin_family = AF_INET;
-
- /* look up the server host's internet address */
- if ((peeraddr_in.sin_addr.s_addr = internet_addr(serverhost)) == -1) {
- fprintf(stderr,"%s: unable to find %s in /etc/hosts or from YP\n",
- progname,serverhost);
- exit(1);
- }; /* if */
-
- if (port == 0) {
- if ((sp = getservbyname ("gnuserv","tcp")) == NULL)
- peeraddr_in.sin_port = htons(DEFAULT_PORT+getuid());
- else
- peeraddr_in.sin_port = sp->s_port;
- } /* if */
- else
- peeraddr_in.sin_port = htons(port);
-
- /* Create the socket. */
- if ((s = socket (AF_INET,SOCK_STREAM, 0))== -1) {
- perror(progname);
- fprintf(stderr,"%s: unable to create socket\n",progname);
- exit(1);
- }; /* if */
-
- /* Try to connect to the remote server at the address
- * which was just built into peeraddr.
- */
- if (connect(s, &peeraddr_in, sizeof(struct sockaddr_in)) == -1) {
- perror(progname);
- fprintf(stderr, "%s: unable to connect to remote\n",progname);
- exit(1);
- }; /* if */
-
- return(s);
-
- } /* connect_to_internet_server */
- #endif /* INTERNET_DOMAIN_SOCKETS */
-
-
- #if defined(INTERNET_DOMAIN_SOCKETS) || defined(UNIX_DOMAIN_SOCKETS)
- /*
- disconnect_from_server -- inform the server that sending has finished, and wait for
- its reply.
- */
- void disconnect_from_server(s,echo)
- int s;
- int echo;
- {
- char buffer[REPLYSIZ];
- int length;
-
- send_string(s,"\n"); /* make sure server gets string */
-
- if (shutdown(s,1) == -1) {
- perror(progname);
- fprintf(stderr, "%s: unable to shutdown socket\n",progname);
- exit(1);
- }; /* if */
-
- while((length = recv(s,buffer,REPLYSIZ,0)) > 0) {
- buffer[length] = '\0';
- if (echo) printf("%s",buffer);
- }; /* while */
-
- if (echo) putchar('\n');
-
- if(length < 0) {
- perror(progname);
- fprintf(stderr,"%s: unable to read the reply from the server\n",progname);
- exit(1);
- }; /* if */
-
- } /* disconnect_from_server */
- #endif /* INTERNET_DOMAIN_SOCKETS || UNIX_DOMAIN_SOCKETS */
-