SP_CONNECT(3) User Manuals SP_CONNECT(3)NAMESP_connect - Connect an application to a daemon
SYNOPSIS
#include <sp.h>
int SP_connect( const char *spread_name, const char *private_name, int
priority, int group_membership, mailbox *mbox, char *private_group);
DESCRIPTIONSP_connect is the initial call an application must make to establish a
connection with a Spread daemon. All other spread calls must refer to
a valid mbox returned by this function.
The spread_name is the name of the Spread daemon to connect to. It
should be a string in one of the following forms:
4803 This will connect to the Spread daemon on the local
machine running on port 4803. This form cannot be used
to connect to a Windows95/NT machine.
4803@localhost
This will also connect to the Spread daemon on the local
machine running on port 4803. This form can be used on
Windows95/NT machines.
4803@host.domain.edu or 4803@128.220.221.99
This will connect to the machine identified by either
domain name or IP address at the specified port.
The private_name is the name this connection would like to be known as.
It must be unique on the machine running the spread daemon. The name
can be of at most MAX_PRIVATE_NAME characters, with the same character
restrictions as a group name (mainly it cannot contain the '#' charac‐
ter). If the application does not care what name it uses, it can pass
in a NULL pointer into this field and the daemon will assign the con‐
nection a unique, random name.
The priority is a 0/1 flag for whether this connection will be a "Pri‐
ority" connection or not. Currently this has no effect.
The group_membership is a boolean integer. If 1 then the application
will receive group membership messages for this connection, if 0 then
the application will not receive any membership change messages.
The mbox should be a pointer to a mailbox variable. After the SP_con‐
nect call returns this variable will hold the mbox for the connection.
The private_group should be a pointer to a string big enough to hold at
least MAX_GROUP_NAME characters. After the Connect call returns it
will contain the private group name of this connection. This group
name can be used to send unicast messages to this connection and no one
can join this special group.
RETURN VALUES
Returns ACCEPT_SESSION on success or one of the following errors ( < 0
):
ILLEGAL_SPREAD
The spread_name given to connect to was illegal for some rea‐
son. Usually because it was a unix socket on Windows95/NT, an
improper format for a host or an illegal port number
COULD_NOT_CONNECT
Lower level socket calls failed to allow a connection to the
specified spread daemon right now.
CONNECTION_CLOSED
During communication to establish the connection errors occured
and the setup could not be completed.
REJECT_VERSION
The daemon or library has a version mismatch.
REJECT_NO_NAME
This is a protocol error which should not occur if the connec‐
tion request is sent correctly to the daemon. It means that the
length of the user name was not sent (if no user name is pro‐
vided a length of 0 must be sent).
REJECT_ILLEGAL_NAME
Name provided violated some requirement (length or used an
illegal character)
REJECT_NOT_UNIQUE
Name provided is not unique on this daemon. Recommended
response is to try again with a different name.
BUGS
None.
AUTHOR
Yair Amir <yairamir@cnds.jhu.edu>
Jonathan Stanton <jonathan@cnds.jhu.edu>
SEE ALSOlibspread(3)SPREAD JULY 1998 SP_CONNECT(3)
