285 lines
7.7 KiB
C
285 lines
7.7 KiB
C
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//
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// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitar.com>
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//
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// This software is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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#ifndef NNG_COMPAT_NN_H
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#define NNG_COMPAT_NN_H
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// This header contains interfaces that are intended to offer compatibility
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// with nanomsg v1.0. These are not the "preferred" interfaces for nng,
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// and consumers should only use these if they are porting software that
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// previously used nanomsg. New programs should use the nng native APIs.
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// Note that compatibility promises are limited to public portions of the
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// nanomsg API, and specifically do NOT extend to the ABI. Furthermore,
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// there may be other limitations around less commonly used portions of the
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// API; for example only SP headers may be transported in control data for
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// messages, there is almost no compatibility offered for statistics.
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// Error values may differ from those returned by nanomsg as well; the nng
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// error reporting facility expresses only a subset of the possibilities of
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// nanomsg.
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// Note that unlike nanomsg, nng does not aggressively recycle socket or
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// endpoint IDs, which means applications which made assumptions that these
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// would be relatively small integers (e.g. to use them as array indices)
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// may break. (No promise about values was ever made.)
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <errno.h>
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#include <stddef.h>
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#include <stdint.h>
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// clang-format gets in the way of most of this file.
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// We turn it off, at least until it gets smarter about aligning
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// macro definitions or we adopt enums or somesuch.
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// clang-format off
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// NNG_DECL is used on declarations to deal with scope.
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// For building Windows DLLs, it should be the appropriate __declspec().
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// For shared libraries with platforms that support hidden visibility,
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// it should evaluate to __attribute__((visibility("default"))).
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#ifndef NN_DECL
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#if defined(_WIN32) && !defined(NNG_STATIC_LIB)
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#if defined(NNG_SHARED_LIB)
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#define NN_DECL __declspec(dllexport)
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#else
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#define NN_DECL __declspec(dllimport)
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#endif // NNG_SHARED_LIB
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#else
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#if defined(NNG_SHARED_LIB) && defined(NNG_HIDDEN_VISIBILITY)
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#define NN_DECL __attribute__((visibility("default")))
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#else
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#define NN_DECL extern
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#endif
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#endif // _WIN32 && !NNG_STATIC_LIB
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#endif // NN_DECL
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#define AF_SP 1
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#define AF_SP_RAW 2
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#define NN_SOCKADDR_MAX 128
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#define NN_SOL_SOCKET 0
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// Flag for send/recv (nonblocking)
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#define NN_DONTWAIT 1
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// CMSG data type
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#define PROTO_SP 1
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#define SP_HDR 1
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// Errnos. Legacy nanomsg uses posix errnos where possible.
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// If a define is not set, use add NN_ERRBASE. nng does not
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// return all of these values, so there may be some loss of
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// of information for edge cases, but we don't expect that to be
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// a problem really.
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#define NN_ERRBASE (0x10000000)
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#ifndef ENOTSUP
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#define ENOTSUP (NN_ERRBASE+1)
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#endif
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#ifndef EPROTONOSUPPORT
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#define EPROTONOSUPPORT (NN_ERRBASE+2)
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#endif
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#ifndef ENOBUFS
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#define ENOBUFS (NN_ERRBASE+3)
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#endif
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#ifndef ENETDOWN
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#define ENETDOWN (NN_ERRBASE+4)
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#endif
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#ifndef EADDRINUSE
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#define EADDRINUSE (NN_ERRBASE+5)
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#endif
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#ifndef EADDRNOTAVAIL
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#define EADDRNOTAVAIL (NN_ERRBASE+6)
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#endif
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#ifndef ENOTSOCK
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#define ENOTSOCK (NN_ERRBASE+7)
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#endif
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#ifndef EAGAIN
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#define EAGAIN (NN_ERRBASE+8)
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#endif
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#ifndef EBADF
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#define EBADF (NN_ERRBASE+9)
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#endif
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#ifndef EINVAL
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#define EINVAL (NN_ERRBASE+10)
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#endif
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#ifndef EMFILE
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#define EMFILE (NN_ERRBASE+11)
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#endif
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#ifndef EFAULT
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#define EFAULT (NN_ERRBASE+12)
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#endif
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#ifndef EACCES
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#define EACCES (NN_ERRBASE+13)
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#endif
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#ifndef ENETRESET
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#define ENETRESET (NN_ERRBASE+14)
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#endif
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#ifndef ENETUNREACH
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#define ENETUNREACH (NN_ERRBASE+15)
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#endif
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#ifndef EHOSTUNREACH
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#define EHOSTUNREACH (NN_ERRBASE+16)
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#endif
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#ifndef EAFNOSUPPORT
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#define EAFNOSUPPORT (NN_ERRBASE+17)
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#endif
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#ifndef EINPROGRESS
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#define EINPROGRESS (NN_ERRBASE+18)
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#endif
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#ifndef EPROTO
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#define EPROTO (NN_ERRBASE+19)
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#endif
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#ifndef ECONNREFUSED
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#define ECONNREFUSED (NN_ERRBASE+20)
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#endif
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#ifndef ENOTCONN
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#define ENOTCONN (NN_ERRBASE+21)
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#endif
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#ifndef EMSGSIZE
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#define EMSGSIZE (NN_ERRBASE+22)
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#endif
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#ifndef ETIMEDOUT
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#define ETIMEDOUT (NN_ERRBASE+23)
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#endif
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#ifndef ECONNABORTED
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#define ECONNABORTED (NN_ERRBASE+24)
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#endif
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#ifndef ECONNRESET
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#define ECONNRESET (NN_ERRBASE+25)
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#endif
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#ifndef ENOPROTOOPT
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#define ENOPROTOOPT (NN_ERRBASE+26)
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#endif
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#ifndef EISCONN
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#define EISCONN (NN_ERRBASE+27)
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#endif
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#ifndef ESOCKNOSUPPORT
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#define ESOCKNOSPPORT (NN_ERRBASE+28)
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#endif
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#ifndef ETERM
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#define ETERM (NN_ERRBASE+29)
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#endif
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#ifndef EFSM
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#define EFSM (NN_ERRBASE+30)
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#endif
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#ifndef ENOENT
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#define ENOENT (NN_ERRBASE+31)
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#endif
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#ifndef EIO
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#define EIO (NN_ERRBASE+32)
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#endif
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#ifndef EEXIST
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#define EEXIST (NN_ERRBASE+33)
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#endif
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#ifndef ENOSPC
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#define ENOSPC (NN_ERRBASE+34)
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#endif
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// Socket options
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#define NN_LINGER 1
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#define NN_SNDBUF 2
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#define NN_RCVBUF 3
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#define NN_SNDTIMEO 4
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#define NN_RCVTIMEO 5
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#define NN_RECONNECT_IVL 6
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#define NN_RECONNECT_IVL_MAX 7
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#define NN_SNDPRIO 8
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#define NN_RCVPRIO 9
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#define NN_SNDFD 10
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#define NN_RCVFD 11
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#define NN_DOMAIN 12
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#define NN_PROTOCOL 13
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#define NN_IPV4ONLY 14
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#define NN_SOCKET_NAME 15
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#define NN_RCVMAXSIZE 16
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#define NN_MAXTTL 17
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// from this point on formatting is fine
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// clang-format on
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// Poll stuff
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#define NN_POLLIN 1
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#define NN_POLLOUT 2
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struct nn_pollfd {
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int fd;
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uint16_t events;
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uint16_t revents;
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};
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// Magical size for allocation
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#define NN_MSG ((size_t) -1)
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struct nn_iovec {
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void * iov_base;
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size_t iov_len;
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};
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struct nn_msghdr {
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struct nn_iovec *msg_iov;
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int msg_iovlen;
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void * msg_control;
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size_t msg_controllen;
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};
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struct nn_cmsghdr {
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size_t cmsg_len;
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int cmsg_level;
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int cmsg_type;
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};
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#define NN_CMSG_ALIGN(len) \
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(((len) + sizeof(size_t) - 1) & (size_t) ~(sizeof(size_t) - 1))
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// Unlike old nanomsg, we explicitly only support the SP header as attached
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// cmsg data. It turns out that old nanomsg didn't really store anything
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// useful otherwise anyway. (One specific exception was that it stored the
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// message type of text or binary for the websocket transport. We don't think
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// anyone used that in practice though.)
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#define NN_CMSG_FIRSTHDR(mh) nn_cmsg_next((struct nn_msghdr *) (mh), NULL)
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#define NN_CMSG_NXTHDR(mh, ch) \
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nn_cmsg_next((struct nn_msghdr *) (mh), (struct nn_cmsghdr *) ch)
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#define NN_CMSG_DATA(ch) ((unsigned char *) (((struct nn_cmsghdr *) (ch)) + 1))
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#define NN_CMSG_SPACE(len) \
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(NN_CMSG_ALIGN(len) + NN_CMSG_ALIGN(sizeof(struct nn_cmsghdr)))
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#define NN_CMSG_LEN(len) (NN_CMSG_ALIGN(sizeof(struct nn_cmsghdr)) + (len))
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NN_DECL struct nn_cmsghdr *nn_cmsg_next(
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struct nn_msghdr *, struct nn_cmsghdr *);
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NN_DECL int nn_socket(int, int);
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NN_DECL int nn_setsockopt(int, int, int, const void *, size_t);
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NN_DECL int nn_getsockopt(int, int, int, void *, size_t *);
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NN_DECL int nn_bind(int, const char *);
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NN_DECL int nn_connect(int, const char *);
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NN_DECL int nn_shutdown(int, int);
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NN_DECL int nn_send(int, const void *, size_t, int);
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NN_DECL int nn_recv(int, void *, size_t, int);
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NN_DECL int nn_sendmsg(int, const struct nn_msghdr *, int);
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NN_DECL int nn_recvmsg(int, struct nn_msghdr *, int);
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NN_DECL int nn_close(int);
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NN_DECL int nn_poll(struct nn_pollfd *, int, int);
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NN_DECL int nn_device(int, int);
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NN_DECL uint64_t nn_get_statistic(int, int);
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NN_DECL void * nn_allocmsg(size_t, int);
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NN_DECL void * nn_reallocmsg(void *, size_t);
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NN_DECL int nn_freemsg(void *);
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NN_DECL int nn_errno(void);
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NN_DECL const char *nn_strerror(int);
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NN_DECL void nn_term(void);
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#ifdef __cplusplus
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}
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#endif
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#endif // NNG_COMPAT_NN_H
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