NAME

       nng_ctx_set - set context option

SYNOPSIS

           #include <nng/nng.h>

           int nng_ctx_set(nng_ctx ctx, const char *opt, const void *val, size_t valsz);

           int nng_ctx_set_bool(nng_ctx ctx, const char *opt, int bval);

           int nng_ctx_set_int(nng_ctx ctx, const char *opt, int ival);

           int nng_ctx_set_ms(nng_ctx ctx, const char *opt, nng_duration dur);

           int nng_ctx_set_size(nng_ctx ctx, const char *opt, size_t z);

           int nng_ctx_set_string(nng_ctx ctx, const char *opt, const char *str);

           int nng_ctx_set_uint64(nng_ctx ctx, const char *opt, uint64_t u64);

DESCRIPTION

           Note
           These functions are deprecated. Please see nng_ctx_set.

       The nng_ctx_set() functions are used to configure options for the context ctx. The actual
       options that may be configured in this way vary, and are specified by opt.

           Note
           Context options are protocol specific. The details will be documented with the
           protocol.

   Forms
       The details of the type, size, and semantics of the option will depend on the actual
       option, and will be documented with the option itself.

       nng_ctx_set()
           This function is untyped, and can be used to configure any arbitrary data. The val
           pointer addresses the data to copy, and valsz is the size of the objected located at
           val.

           Tip
           It may be easier to use one of the typed forms of this function.

       nng_ctx_set_bool()
           This function is for options which take a Boolean (bool). The bval is passed to the
           option.

       nng_ctx_set_int()
           This function is for options which take an integer (int). The ival is passed to the
           option.

       nng_ctx_set_ms()
           This function is used to configure time durations (such as timeouts) using type
           nng_duration. The duration dur is an integer number of milliseconds.

       nng_ctx_set_size()
           This function is used to configure a size, z, typically for buffer sizes, message
           maximum sizes, and similar options.

       nng_ctx_set_string()
           This function is used to pass configure a string, str. Strings passed this way must be
           legal UTF-8 or ASCII strings, terminated with a NUL (\0) byte. (Other constraints may
           apply as well, see the documentation for each option for details.)

       nng_ctx_set_uint64()
           This function is used to configure a 64-bit unsigned value, u64. This is typically
           used for options related to identifiers, network numbers, and similar.

RETURN VALUES

       These functions return 0 on success, and non-zero otherwise.

ERRORS

       NNG_ECLOSED
           Parameter s does not refer to an open socket.

       NNG_EINVAL
           The value being passed is invalid.

       NNG_ENOTSUP
           The option opt is not supported.

       NNG_EREADONLY
           The option opt is read-only.

       NNG_ESTATE
           The socket is in an inappropriate state for setting this option.

SEE ALSO

       nng_ctx_get(3), nng_socket_set(3), nng_strerror(3), nng_ctx(5), nng_options(5),
       nng_socket(5), nng(7)

                                            2024-10-11                             NNG_CTX_SET(3)