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Context information that's passed between resource-manager functions
#include <sys/resmgr.h>
typedef struct _resmgr_context {
int rcvid;
struct _msg_info info;
resmgr_iomsgs_t *msg;
dispatch_t *dpp;
int id;
unsigned tid;
unsigned msg_max_size;
int status;
int offset;
int size;
iov_t iov[1];
} resmgr_context_t;
The resmgr_context_t structure defines context information
that's passed to resource-manager functions.
The members include:
- rcvid
- The receive ID to use for messages to and from the client.
- info
- A
_msg_info
structure that contains
information about the message received by the resource manager.
- msg
- A pointer to the message received by the resource manager, expressed
as a union of all the possible message types.
- dpp
- The dispatch handle, created by
dispatch_create().
- id
- The link Id, returned by
resmgr_attach().
- tid
- Not used; always zero.
- msg_max_size
- The minimum amount of space reserved for receiving a message.
- status
- A place to store the status of the current operation.
Always use
_RESMGR_STATUS()
to set this member.
- offset
- The offset, in bytes, into the client's message.
You'll use this when working with combine messages.
- size
- The number of valid bytes in the message area.
- iov
- An I/O vector where you can place the data that you're returning to the
client.
QNX Neutrino
dispatch_create(),
_msg_info,
MsgInfo(),
resmgr_attach(),
resmgr_context_alloc(),
resmgr_context_free(),
_RESMGR_STATUS()
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