ConnectServerInfo(), ConnectServerInfo_r()

Arguments:

pid

The process ID of the owner of the connection, or 0 to search for the connection in the current process.

coid

The connection ID of the connection.

info

NULL, or a pointer to a _server_info structure where the function can store information about the connection. For more information, see below.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The ConnectServerInfo() and ConnectServerInfo_r() kernel calls get information about the connection coid owned by process pid, and store it in the structure pointed to by info. If the process doesn't have a connection coid, the call scans for the next higher connection and returns it if present. Otherwise, -1 is returned. If you wish to check for the existence of an exact connection, you must compare the returned connection with the coid you requested.

These functions are identical except in the way they indicate errors. See the Returns section for details.

If the info argument is NULL, ConnectServerInfo() ignores connections with dead servers and skips to the next coid. If info is non-NULL, the function fills in the _server_info structure; for connections with dead servers, it turns on the _NTO_COF_DEAD bit in the flags field of the structure.

_server_info structure

The _server_info structure that info points to includes at least the following members:

uint32_t nd

The server's node descriptor, a temporary numeric description of a remote node; ND_LOCAL_NODE (or 0) is the descriptor for the local node. For more information, see the Qnet Networking chapter of the System Architecture guide.

To:	Use this function:
Compare two nd objects	ND_NODE_CMP()
Convert a nd to text	netmgr_ndtostr()
Convert text to a nd	netmgr_strtond()

pid_t pid

The server's process ID.

int32_t chid

The server's channel ID.

int32_t scoid

The server's connection ID.

int32_t coid

The client's connection ID.

int16_t flags

Flags that indicate the properties of the connection. The bits include:

• _NTO_COF_CLOEXEC — the connection will be closed when your process calls an exec*() function to start a new process.
• _NTO_COF_DEAD — the connection is to a dead server.
• _NTO_COF_INSECURE (QNX Neutrino 6.6 or later) — the connection is insecure. The kernel sets this flag on a connection if the client program replaces its process image (e.g., by calling exec*()) with a setuid or setgid binary. Until the process that owns the channel clears this flag, calls to MsgDeliverEvent() with an event type of SIGEV_MEMORY or SIGEV_THREAD fail with an error of EACCES.

Returns:

A matched coid. If an error occurs:

• ConnectServerInfo() returns -1 and sets errno.
• ConnectServerInfo_r() returns the negative of a value from the Errors section and doesn't set errno.

Errors:

EFAULT

A fault occurred when the kernel tried to access the buffers provided.

EINVAL

Process pid doesn't have a connection >= coid.

ESRCH

The process indicated by pid doesn't exist.

Classification:

QNX Neutrino