socket.zig

pub fn keepalive() void {}
const std = @import("std");
const util = @import("util.zig");

// The upstream zig/wasi layer by default has a very badly crippled
// sockaddr struct defined with sa_data having size 0, so it is
// *impossible* to use.   Thus -- just for importing socket.h --
// we temporarily set __wasilibc_unmodified_upstream.  We patch
// cPython (Modules/socketmodule.h) and do the same thing there.
// The result is we get the
// non-WASI *normal* version of sockaddr. This is important to
// actually do both here and in cPython, since just attempting to
// cast, etc., is going to lead to random corruption.

// IMPORTANT: do not use this @cImport for error codes -- the "__wasilibc_unmodified_upstream" allows for all
// the SO constants, etc., but defines all the error codes incorrectly.
// Note that any c code that needs to use these has to be patched,
// similar to how we patch socketmodule.h.  Be sure to only
// patch the import of socket.h, since error codes would also be
// messed up by setting __wasilibc_unmodified_upstream!!!
// **E.g., EINPROGRESS is changed from 28 to 115!**

const c = @cImport({
    @cDefine("__wasilibc_unmodified_upstream", "1");
    @cInclude("sys/socket.h");
});

// TODO: These scare me. if really used, I should move them to posix-wasm.h,
// define them myself, and so on.   Touching __wasilibc_unmodified_upstream is
// VERY VERY bad.
pub const constants = .{ .c_import = c, .names = [_][:0]const u8{
    "MSG_OOB",
    "MSG_PEEK",
    "MSG_WAITALL",
    "MSG_DONTROUTE",
    "SO_ACCEPTCONN",
    "SO_ATTACH_BPF",
    "SO_ATTACH_FILTER",
    "SO_ATTACH_REUSEPORT_CBPF",
    "SO_ATTACH_REUSEPORT_EBPF",
    "SO_BINDTODEVICE",
    "SO_BINDTOIFINDEX",
    "SO_BPF_EXTENSIONS",
    "SO_BROADCAST",
    "SO_BSDCOMPAT",
    "SO_BUSY_POLL",
    "SO_CNX_ADVICE",
    "SO_COOKIE",
    "SO_DEBUG",
    "SO_DETACH_BPF",
    "SO_DETACH_FILTER",
    "SO_DETACH_REUSEPORT_BPF",
    "SO_DOMAIN",
    "SO_DONTROUTE",
    "SO_ERROR",
    "SO_GET_FILTER",
    "SO_INCOMING_CPU",
    "SO_INCOMING_NAPI_ID",
    "SO_KEEPALIVE",
    "SO_LINGER",
    "SO_LOCK_FILTER",
    "SO_MARK",
    "SO_MAX_PACING_RATE",
    "SO_MEMINFO",
    "SO_NOFCS",
    "SO_NO_CHECK",
    "SO_OOBINLINE",
    "SO_PASSCRED",
    "SO_PASSSEC",
    "SO_PEEK_OFF",
    "SO_PEERCRED",
    "SO_PEERGROUPS",
    "SO_PEERNAME",
    "SO_PEERSEC",
    "SO_PRIORITY",
    "SO_PROTOCOL",
    "SO_RCVBUF",
    "SO_RCVBUFFORCE",
    "SO_RCVLOWAT",
    "SO_RCVTIMEO",
    "SO_REUSEADDR",
    "SO_REUSEPORT",
    "SO_RXQ_OVFL",
    "SO_SECURITY_AUTHENTICATION",
    "SO_SECURITY_ENCRYPTION_NETWORK",
    "SO_SECURITY_ENCRYPTION_TRANSPORT",
    "SO_SELECT_ERR_QUEUE",
    "SO_SNDBUF",
    "SO_SNDBUFFORCE",
    "SO_SNDLOWAT",
    "SO_SNDTIMEO",
    "SO_TIMESTAMP",
    "SO_TIMESTAMPING",
    "SO_TIMESTAMPNS",
    "SO_TXTIME",
    "SO_TYPE",
    "SO_WIFI_STATUS",
    "SO_ZEROCOPY",
} };

// sockaddr is this:   struct { sa_family: u16, sa_data: [14]u8 };

export fn recv_sockaddr_sa_family(sockaddr: *c.sockaddr) u16 {
    //  std.debug.print("sockaddr = {}\n", .{sockaddr});
    return sockaddr.sa_family;
}

// do NOT free the returned string - it's just a reference into sockaddr
export fn recv_sockaddr_sa_data(sockaddr: *c.sockaddr) [*]u8 {
    return &(sockaddr.sa_data);
}