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Establish a connection to be used for asynchronous messages between a process and a channel
|
Asynchronous messaging is an experimental feature;
for information about the use of
experimental software, see the Commercial Software License Agreement (CSLA) or
Partner Software License Agreement (PSLA) in the Licensing area of our website,
http://www.qnx.com/legal/licensing/. |
#include <sys/asyncmsg.h>
int asyncmsg_connect_attach (
uint32_t nd,
pid_t pid,
int chid,
unsigned index,
unsigned flags,
const struct _asyncmsg_connection_attr * attr);
- nd
- The node descriptor of the node on which the process that owns the
channel is running.
- pid
- The process ID of the owner of the channel.
- chid
- The channel ID, returned by asyncmsg_channel_create(), of
the channel to connect to the process.
- index
- The lowest acceptable connection ID.
- flags
- Flags that specify the type and attributes of the connection:
- _NTO_COF_NOSHARE
- User wants to use its own buffer; otherwise the user
gets the buffer from the asyncmsg_malloc() call, fills it in and sends
it by calling the asyncmsg_put() function.
- _NTO_COF_NONBLOCK
- Don't block waiting if all the send headers are in use.
- attr
- A pointer to an
_asyncmsg_connection_attr
structure that specifies the connection attributes.
libasyncmsg
Use the -l asyncmsg option to
qcc
to link against this library.
The asyncmsg_connect_attach() function establishes a connection between
the calling process and a channel identified by the arguments nd, pid
and chid. The system returns the first available connection ID
starting at the value specified by the index argument.
A connection ID, or -1 if an error occurred
(errno is set).
- EAGAIN
- All kernel channel objects are in use.
- ESRCH
- The node indicated by nd, the process indicated by pid or
the channel indicated by chid does not exist.
QNX Neutrino
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
asyncmsg_channel_create(),
asyncmsg_channel_destroy(),
asyncmsg_connect_attr(),
asyncmsg_connect_detach(),
asyncmsg_flush(),
asyncmsg_free(),
asyncmsg_get(),
asyncmsg_malloc(),
asyncmsg_put(),
asyncmsg_putv()
ConnectAttach()
Asynchronous Messaging
Technote
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