int u_open(u_port_t port) {
int error;
struct sockaddr_in server;
int sock;
int true = 1;
if ((u_ignore_sigpipe() == -1) ||
((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1))
return -1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&true,
sizeof(true)) == -1) {
error = errno;
while ((close(sock) == -1) && (errno == EINTR));
errno = error;
return -1;
}
server.sin_family = AF_INET;
server.sin_addr.s_addr = htonl(INADDR_ANY);
server.sin_port = htons((short)port);
if ((bind(sock, (struct sockaddr *)&server, sizeof(server)) == -1) ||
(listen(sock, MAXBACKLOG) == -1)) {
error = errno;
while ((close(sock) == -1) && (errno == EINTR));
errno = error;
return -1;
}
return sock;
}
/*
* u_connect
* Initiate communication with a remote server.
*
* parameters:
* port = well-known port on remote server
* hostn = character string giving the Internet name of the
* remote machine
* returns: the file descriptor used for communication if successful
* -1 on error on system error that sets errno
* U_EHOST if hostn cannot be resolved
* U_ECONNECTION if connection fails
*/
int u_connect(u_port_t port, char *hostn)
{
int retval;
struct sockaddr_in server;
int sock;
int error;
if (name_to_addr(hostn,&(server.sin_addr.s_addr)) < 0) {
errno = EINVAL;
return -1;
}
server.sin_port = htons((short)port);
server.sin_family = AF_INET;
if ( (u_ignore_sigpipe() != 0) ||
((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) )
return -1;
while ( ((retval =
connect(sock, (struct sockaddr *)&server, sizeof(server))) == -1)
&& (errno == EINTR) )
;
if (retval == -1) {
error = errno;
close(sock);
errno = error;
return -1;
}
return sock;
}
/*
* u_connect
* Initiate communication with a remote server.
*
* parameters:
* port = well-known port on remote server
* hostn = character string giving the Internet name of remote host
* returns: a communication file descriptor if successful
* -1 on error with errno set
*/
int u_connect(u_port_t port, char *hostn) {
int error;
int retval;
struct sockaddr_in server;
int sock;
fd_set sockset;
struct hostent *phe;
/* fix broken name resolution for hosts beginning with a
* digit, plus get rid of hostname lookup stuff
*/
if(inet_addr(hostn) == INADDR_NONE) {
phe=gethostbyname(hostn);
if(phe == NULL) {
errno = EINVAL;
return -1;
}
memcpy((char*)&server.sin_addr,(char*)(phe->h_addr_list[0]),
sizeof(struct in_addr));
} else {
server.sin_addr.s_addr=inet_addr(hostn);
}
server.sin_port = htons((short)port);
server.sin_family = AF_INET;
if ((u_ignore_sigpipe() == -1) ||
((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1))
return -1;
if (((retval =
connect(sock, (struct sockaddr *)&server, sizeof(server))) == -1) &&
((errno == EINTR) || (errno == EALREADY))) {
FD_ZERO(&sockset);
FD_SET(sock, &sockset);
while ( ((retval = select(sock+1, NULL, &sockset, NULL, NULL)) == -1) &&
(errno == EINTR) ) {
FD_ZERO(&sockset);
FD_SET(sock, &sockset);
}
}
if (retval == -1) {
error = errno;
while ((close(sock) == -1) && (errno == EINTR));
errno = error;
return -1;
}
return sock;
}
/*
* u_connect
* Initiate communication with a remote server.
*
* parameters:
* port = well-known port on remote server
* hostn = character string giving the Internet name of remote host
* returns: a communication file descriptor if successful
* -1 on error with errno set
*/
int u_connect(u_port_t port, char *hostn) {
int error;
int retval;
struct sockaddr_in server;
int sock;
fd_set sockset;
if (name2addr(hostn,&(server.sin_addr.s_addr)) == -1) {
errno = EINVAL;
return -1;
}
server.sin_port = htons((short)port);
server.sin_family = AF_INET;
if ((u_ignore_sigpipe() == -1) ||
((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1))
return -1;
if (((retval =
connect(sock, (struct sockaddr *)&server, sizeof(server))) == -1) &&
((errno == EINTR) || (errno == EALREADY))) {
FD_ZERO(&sockset);
FD_SET(sock, &sockset);
while ( ((retval = select(sock+1, NULL, &sockset, NULL, NULL)) == -1) &&
(errno == EINTR) ) {
FD_ZERO(&sockset);
FD_SET(sock, &sockset);
}
}
if (retval == -1) {
error = errno;
while ((close(sock) == -1) && (errno == EINTR));
errno = error;
return -1;
}
return sock;
}
