ham_connect(), ham_connect_nd(), ham_connect_node()

Connect to the HAM

Synopsis:

#include <ha/ham.h>

int ham_connect( unsigned flags);
int ham_connect_nd( int nd, unsigned flags);
int ham_connect_node( const char *nodename, unsigned flags);

Library:

libham

Description:

The ham_connect() function initializes a connection to a HAM. The ham_connect_nd() and ham_connect_node() functions initialize connections to remote HAMs.

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A process may have only a single connection open to a HAM at any time.

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The nd specified to ham_connect_nd is the node identifier of the remote node at the time the ham_connect_nd() call is made.

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Since node identifiers are transient objects, you should obtain the value for nd immediately before the call, using netmgr_strtond() or another function that converts nodenames into node identifiers.

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The ham_connect_node() function takes as a parameter a fully qualified node name (FQNN).

You can call these functions any number of times, but because the library maintains a reference count, you need to call ham_disconnect() the same number of times to release the connection.

Connections are associated with a specific process ID (pid). If a process performs ham_connect() and then calls fork(), the child process needs to reconnect to the HAM by calling ham_connect() again.

But if a process calls any of the following:

• ham_attach_self()
• ham_attach()
• ham_attach_node()
• ham_detach()
• ham_detach_self()
• ham_detach_name()
• ham_detach_name_node()
• ham_stop()
• ham_stop_nd()
• ham_stop_node()
• ham_entity()
• ham_entity_node()
• ham_verbose()

it doesn't need to call ham_connect*(), since those functions do so on their own.

For all other ham*() functions, clients must call ham_connect() first.

There are no flags defined at this time.

Returns:

0

Success.

-1

An error occurred (errno is set).

Errors:

Upon failure, the ham_connect*() functions return the error as set by the underlying open() library call that failed.

Classification:

QNX Neutrino

See also:

ham_attach_self(), ham_disconnect(), ham_stop()

In the Library Reference: fork(), open(), netmgr_strtond()