nanomsg
Home Download Documentation Development Community Support
NOTE: This documentation is for version 0.1-alpha of nanomsg, but the latest released version is 1.1.2. Please see the documentation for 1.1.2 for the most up-to-date information.
nn_symbol(3)

SYNOPSIS

#include <nanomsg/nn.h>

const char *nn_symbol (int i, int *value);

DESCRIPTION

Retrieves the symbol name and value at index i. Indices start at 0. An index has no significance to its associated symbol; the mappings may change between library versions.

Typically a client will iterate through the symbols until nn_symbol returns NULL in order to collect all the symbols.

All symbols exposed by nn_symbol are available directly in the C API, generally as preprocessor macros. Thus, this function is useful mostly for language bindings that can’t parse the header file and rely on retrieving the symbols in the runtime.

RETURN VALUE

If i is valid, returns the name of the symbol at that index. If the pointer value is not NULL, the symbol’s value is stored there.

If i is out-of-range, nn_symbol returns NULL and sets errno to EINVAL.

ERRORS

EINVAL

The passed index i was out-of-range; it was less than zero or greater-than-or- equal-to the number of symbols.

EXAMPLE

int value, i;
for (i = 0; ; ++i) {
    const char* name = nn_symbol (i, &value);
    if (name == NULL) break;
    printf ("'%s' = %d\n", name, value);
}

SEE ALSO

AUTHORS

Evan Wies <evan@neomantra.net>


"nanomsg" is a trademark of Garrett D'Amore.