1NN_ERRNO(3)                      nanomsg 1.1.5                     NN_ERRNO(3)
2
3
4

NAME

6       nn_errno - retrieve the current errno
7

SYNOPSIS

9       #include <nanomsg/nn.h>
10
11       int nn_errno (void);
12

DESCRIPTION

14       Returns value of errno for the current thread.
15
16       On most systems, errno can be accessed directly and this function is
17       not needed. However, on Windows, there are multiple implementations of
18       the CRT library (single-threaded, multi-threaded, release, debug) and
19       each of them has its own instance of errno. Thus, if nanomsg library
20       and the application that uses it link with different versions of the
21       CRT library, they don’t share the same instance of errno. Consequently,
22       error codes set by nanomsg cannot be accessed by the application. To
23       overcome this problem, application can use nn_errno() function to
24       retrieve nanomsg’s value of errno.
25

RETURN VALUE

27       Returns value of errno for the current thread.
28

ERRORS

30       No errors are defined.
31

EXAMPLE

33           rc = nn_send (s, "ABC", 3, 0);
34           if (rc < 0)
35               printf ("nn_send failed with error code %d\n", nn_errno ());
36

SEE ALSO

38       nn_strerror(3) nanomsg(7)
39

AUTHORS

41       Martin Sustrik <sustrik@250bpm.com>
42
43
44
45                                  2020-01-29                       NN_ERRNO(3)