Store extended information about a client connection


#include <sys/neutrino.h>

int ConnectClientInfoExt( int scoid,
                          struct _client_info ** info,
                          int flags );


A server connection ID that identifies the client process that you want to get information about, or -1 to get information about the calling process. This client is typically a process that's made a connection to the server to try to access a resource. You can get it from the _msg_info argument to MsgReceivev() or MsgInfo().
The address of a location where the function can store a pointer to a _client_info structure that the function can fill with information about the client. For more information, see below.
Zero or more of the following:
  • _NTO_CLIENTINFO_GETGROUPS — get the supplementary group IDs



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


This call gets information about a client connection identified by scoid, allocates a buffer, stores the information in the buffer, and stores a pointer to the buffer in the location that info points to. Use ClientInfoExtFree() to free this buffer.

A server uses this function to determine whether or not a client has permission to access a resource. For example, in a resource manager, it would be called on an open() connection request.

The ConnectClientInfoExt() function is an extended version of ConnectClientInfo() that can handle more than NGROUPS_MAX supplementary groups.

_client_info structure

The _client_info structure has at least the following members:

uint32_t nd
The client'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 client's process ID.
pid_t sid
Used internally by Qnet.
  • _NTO_CI_ENDIAN_BIG — the client is on a big-endian machine.
  • _NTO_CI_BKGND_PGRP — the client's process group is in the background.
  • _NTO_CI_ORPHAN_PGRP — the client's process group has been orphaned.
  • _NTO_CI_STOPPED — the client is stopped.
  • _NTO_CI_UNABLE — the client doesn't have the required abilities; see ConnectClientInfoAble(), procmgr_ability(), and procmgr_ability_create().
  • _NTO_CI_FULL_GROUPS — indicates that the client information contains the full group list. Set by ConnectClientInfoExt(), but not ConnectClientInfo().
struct _cred_info cred
A _cred_info structure that describes the user and group ID credentials of the sending process.
Note: The grouplist array in this structure doesn't include the primary group ID (unless it was also added as a supplementary group).


0, or -1 if an error occurred (errno is set).


A fault occurred when the kernel tried to access the buffers provided.
The process doesn't have a connection scoid.


QNX Neutrino

Cancellation point No
Interrupt handler No
Signal handler Yes
Thread Yes