ConnectClientInfoExt()

Arguments:

scoid

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().

info

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.

flags

Zero or more of the following:

• _NTO_CLIENTINFO_GETGROUPS — get the supplementary group IDs
• _NTO_CLIENTINFO_GETTYPEID — results in the type identifier being returned immediately after the last returned supplementary group

Library:

libc

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

Description:

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:

pid_t pid

The client's process ID.

flags

• _NTO_CI_BKGND_PGRP — the client's process group is in the background.
• _NTO_CI_CHROOT — chroot() has been applied to the client process.
• _NTO_CI_ENDIAN_BIG — the client is on a big-endian machine.
• _NTO_CI_FULL_GROUPS — indicates that the client information contains the full group list. Set by ConnectClientInfoExt(), but not ConnectClientInfo().
• _NTO_CI_ORPHAN_PGRP — the client's process group has been orphaned.
• _NTO_CI_STOPPED — the client is stopped.
• _NTO_CI_TYPE_ID — the array of supplemetary group IDs is followed by the type ID.
• _NTO_CI_UNABLE — the client doesn't have the required abilities; see ConnectClientInfoAble(), procmgr_ability(), and procmgr_ability_create().

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).

Returns:

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

Errors:

EFAULT

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

EINVAL

The process doesn't have a connection scoid.

ENOMEM

The function couldn't allocate the memory for the _client_info structure.

Classification:

QNX OS