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erl_global(3erl) | C Library Functions | erl_global(3erl) |
NAME¶
erl_global - Access globally registered names.DESCRIPTION¶
This module provides support for registering, looking up, and unregistering names in the global module. For more information, see kernel:global. Notice that the functions below perform an RPC using an open file descriptor provided by the caller. This file descriptor must not be used for other traffic during the global operation, as the function can then receive unexpected data and fail.EXPORTS¶
char **erl_global_names(fd,count)
Types:
int fd;
int *count;
Retrieves a list of all known global names.
On success, the function returns an array of strings, each containing a single
registered name, and sets count to the number of names found. The array
is terminated by a single NULL pointer. On failure, the function
returns NULL and count is not modified.
int erl_global_register(fd,name,pid)
- *
- fd is an open descriptor to an Erlang connection.
- *
- count is the address of an integer, or NULL. If count is not NULL, it is set by the function to the number of names found.
Note:
It is the caller's responsibility to free the array afterwards. It has been
allocated by the function with a single call to malloc(), so a single
free() is all that is necessary.
Types:
int fd;
const char *name;
ETERM *pid;
Registers a name in global.
Returns 0 on success, otherwise -1.
int erl_global_unregister(fd,name)
- *
- fd is an open descriptor to an Erlang connection.
- *
- name is the name to register in global.
- *
- pid is the pid that is to be associated with name. This value is returned by global when processes request the location of name.
Types:
int fd;
const char *name;
Unregisters a name from global.
Returns 0 on success, otherwise -1.
ETERM *erl_global_whereis(fd,name,node)
- *
- fd is an open descriptor to an Erlang connection.
- *
- name is the name to unregister from global.
Types:
int fd;
const char *name;
char *node;
Looks up a name in global.
If node is not NULL, it is a pointer to a buffer where the
function can fill in the name of the node where name is found.
node can be passed directly to erl_connect() if necessary.
On success, the function returns an Erlang pid containing the address of the
specified name, and the node is initialized to the node name where name
is found. On failure, NULL is returned and node is not
modified.
- *
- fd is an open descriptor to an Erlang connection.
- *
- name is the name that is to be looked up in global.
erl_interface 3.9.2 | Ericsson AB |