| nn_errno(3) |
| =========== |
| |
| NAME |
| ---- |
| nn_errno - retrieve the current errno |
| |
| |
| SYNOPSIS |
| -------- |
| *#include <nanomsg/nn.h>* |
| |
| *int nn_errno (void);* |
| |
| |
| DESCRIPTION |
| ----------- |
| Returns value of 'errno' for the current thread. |
| |
| On most systems, 'errno' can be accessed directly and this function is not |
| needed. However, on Windows, there are multiple implementations of the CRT |
| library (single-threaded, multi-threaded, release, debug) and each of them |
| has its own instance of 'errno'. Thus, if nanomsg library and the application |
| that uses it link with different versions of CRT library, they don't share |
| same instance of 'errno'. Consequently, error codes set by nanomsg cannot be |
| accessed by the application. To overcome this problem, application can use |
| _nn_errno()_ function to retrieve the nanomsg's value of 'errno'. |
| |
| RETURN VALUE |
| ------------ |
| Returns value of 'errno' for the current thread. |
| |
| |
| ERRORS |
| ------ |
| No errors are defined. |
| |
| |
| EXAMPLE |
| ------- |
| |
| ---- |
| rc = nn_send (s, "ABC", 3, 0); |
| if (rc < 0) |
| printf ("nn_send failed with error code %d\n", nn_errno ()); |
| ---- |
| |
| |
| SEE ALSO |
| -------- |
| linknanomsg:nn_strerror[3] |
| linknanomsg:nanomsg[7] |
| |
| AUTHORS |
| ------- |
| Martin Sustrik <sustrik@250bpm.com> |
| |
