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## nng_ctx_id
Return numeric context identifier.
### Synopsis
```c
#include <nng/nng.h>
int nng_ctx_id(nng_ctx c);
```
### Description
The `nng_ctx_id` function returns a positive identifier for the context _c_, if it is valid.
Otherwise it returns `-1`.
A context is considered valid if it was ever opened with xref:nng_ctx_open.adoc[`nng_ctx_open`].
Contexts that are allocated on the stack or statically should be initialized with the macro ((`NNG_CTX_INITIALIZER`)) to ensure that they cannot be confused with another valid context.
### Return Values
This function returns the positive value for the context identifier, or `-1` if the context is invalid.
### See Also
xref:nng_ctx_open.adoc[nng_ctx_open]
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