Get extended information about a client connection
Synopsis:
#include <sys/neutrino.h>
int ConnectClientInfoExt( int scoid,
struct _client_info ** info,
int flags );
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:
- 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.
- pid_t pid
- The client's process ID.
- pid_t sid
- Used internally by Qnet.
- flags
-
- _NTO_CI_BITS_64 (QNX Neutrino 7.0 or later) — the sender is using a 64-bit architecture.
- _NTO_CI_BKGND_PGRP — the client's process group is in the background.
- _NTO_CI_CHROOT (QNX Neutrino 7.0 or later) —
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_SANDBOX (QNX Neutrino 7.0 or later) — the client process has been
constrained to a sandbox.
- _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 Neutrino
Safety: |
|
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |