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/* Copyright Massachusetts Institute of Technology 1988 */
/*
* THIS IS AN OS DEPENDENT FILE! It should work on 4.2BSD derived
* systems. VMS and System V should plan to have their own version.
*
* This code was cribbed from lib/X/XConnDis.c.
* Compile using
* % cc -c socket.c -DUNIXCONN
*/
#include <stdio.h>
#include <X11/Xos.h>
#include <X11/Xproto.h>
#include <errno.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#include <netdb.h>
#include <sys/socket.h>
#ifndef hpux
#include <netinet/tcp.h>
#endif
extern int errno; /* Certain (broken) OS's don't have this */
/* decl in errno.h */
#ifdef UNIXCONN
#include <sys/un.h>
#ifndef X_UNIX_PATH
#ifdef hpux
#define X_UNIX_PATH "/usr/spool/sockets/X11/"
#define OLD_UNIX_PATH "/tmp/.X11-unix/X"
#else /* hpux */
#define X_UNIX_PATH "/tmp/.X11-unix/X"
#endif /* hpux */
#endif /* X_UNIX_PATH */
#endif /* UNIXCONN */
#ifndef hpux
void bcopy();
#endif /* hpux */
/*
* Attempts to connect to server, given host and display. Returns file
* descriptor (network socket) or 0 if connection fails.
*/
int connect_to_server (host, display)
char *host;
int display;
{
struct sockaddr_in inaddr; /* INET socket address. */
struct sockaddr *addr; /* address to connect to */
struct hostent *host_ptr;
int addrlen; /* length of address */
#ifdef UNIXCONN
struct sockaddr_un unaddr; /* UNIX socket address. */
#endif
extern char *getenv();
extern struct hostent *gethostbyname();
int fd; /* Network socket */
{
#ifdef UNIXCONN
if ((host[0] == '\0') || (strcmp("unix", host) == 0)) {
/* Connect locally using Unix domain. */
unaddr.sun_family = AF_UNIX;
(void) strcpy(unaddr.sun_path, X_UNIX_PATH);
(void) sprintf(&unaddr.sun_path[strlen(unaddr.sun_path)], "%d", display);
addr = (struct sockaddr *) &unaddr;
addrlen = strlen(unaddr.sun_path) + 2;
/*
* Open the network connection.
*/
if ((fd = socket((int) addr->sa_family, SOCK_STREAM, 0)) < 0) {
#ifdef hpux /* this is disgusting */ /* cribbed from X11R4 xlib source */
if (errno == ENOENT) { /* No such file or directory */
(void) sprintf(unaddr.sun_path, "%s%d", OLD_UNIX_PATH, display);
addrlen = strlen(unaddr.sun_path) + 2;
if ((fd = socket ((int) addr->sa_family, SOCK_STREAM, 0)) < 0)
return(-1); /* errno set by most recent system call. */
} else
#endif /* hpux */
return(-1); /* errno set by system call. */
}
} else
#endif /* UNIXCONN */
{
/* Get the statistics on the specified host. */
if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
{
if ((host_ptr = gethostbyname(host)) == NULL)
{
/* No such host! */
errno = EINVAL;
return(-1);
}
/* Check the address type for an internet host. */
if (host_ptr->h_addrtype != AF_INET)
{
/* Not an Internet host! */
errno = EPROTOTYPE;
return(-1);
}
/* Set up the socket data. */
inaddr.sin_family = host_ptr->h_addrtype;
#ifdef hpux
(void) memcpy((char *)&inaddr.sin_addr,
(char *)host_ptr->h_addr,
sizeof(inaddr.sin_addr));
#else /* hpux */
(void) bcopy((char *)host_ptr->h_addr,
(char *)&inaddr.sin_addr,
sizeof(inaddr.sin_addr));
#endif /* hpux */
}
else
{
inaddr.sin_family = AF_INET;
}
addr = (struct sockaddr *) &inaddr;
addrlen = sizeof (struct sockaddr_in);
inaddr.sin_port = display + X_TCP_PORT;
inaddr.sin_port = htons(inaddr.sin_port);
/*
* Open the network connection.
*/
if ((fd = socket((int) addr->sa_family, SOCK_STREAM, 0)) < 0){
return(-1); /* errno set by system call. */}
/* make sure to turn off TCP coalescence */
#ifdef TCP_NODELAY
{
int mi = 1;
setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &mi, sizeof (int));
}
#endif
}
/*
* Changed 9/89 to retry connection if system call was interrupted. This
* is necessary for multiprocessing implementations that use timers,
* since the timer results in a SIGALRM. -- jdi
*/
while (connect(fd, addr, addrlen) == -1) {
if (errno != EINTR) {
(void) close (fd);
return(-1); /* errno set by system call. */
}
}
}
/*
* Return the id if the connection succeeded.
*/
return(fd);
}
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