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Fix Issue 23157 - undefined reference to `__cmsg_nxthdr' on Alpine Li… #3830

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Fix Issue 23157 - undefined reference to `__cmsg_nxthdr' on Alpine Li… #3830

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36 changes: 33 additions & 3 deletions src/core/sys/posix/sys/socket.d
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Original file line number Diff line number Diff line change
Expand Up @@ -188,10 +188,40 @@ version (linux)

extern (D) inout(ubyte)* CMSG_DATA( return scope inout(cmsghdr)* cmsg ) pure nothrow @nogc { return cast(ubyte*)( cmsg + 1 ); }

private inout(cmsghdr)* __cmsg_nxthdr(inout(msghdr)*, inout(cmsghdr)*) pure nothrow @nogc;
extern (D) inout(cmsghdr)* CMSG_NXTHDR(inout(msghdr)* msg, inout(cmsghdr)* cmsg) pure nothrow @nogc
version (CRuntime_Musl)
{
return __cmsg_nxthdr(msg, cmsg);
extern (D)
{
private size_t __CMSG_LEN(inout(cmsghdr)* cmsg) pure nothrow @nogc
{
return (cmsg.cmsg_len + size_t.sizeof -1) & cast(size_t)(~(size_t.sizeof - 1));
}

private inout(cmsghdr)* __CMSG_NEXT(inout(cmsghdr)* cmsg) pure nothrow @nogc
{
return cmsg + __CMSG_LEN(cmsg);
}

private inout(msghdr)* __MHDR_END(inout(msghdr)* mhdr) pure nothrow @nogc
{
return cast(inout(msghdr)*)(mhdr.msg_control + mhdr.msg_controllen);
}

inout(cmsghdr)* CMSG_NXTHDR(inout(msghdr)* msg, inout(cmsghdr)* cmsg) pure nothrow @nogc
{
return cmsg.cmsg_len < cmsghdr.sizeof ||
__CMSG_LEN(cmsg) + cmsghdr.sizeof >= __MHDR_END(msg) - cast(inout(msghdr)*)(cmsg)
? cast(inout(cmsghdr)*) null : cast(inout(cmsghdr)*) __CMSG_NEXT(cmsg);
}
}
}
else
{
private inout(cmsghdr)* __cmsg_nxthdr(inout(msghdr)*, inout(cmsghdr)*) pure nothrow @nogc;
extern (D) inout(cmsghdr)* CMSG_NXTHDR(inout(msghdr)* msg, inout(cmsghdr)* cmsg) pure nothrow @nogc
{
return __cmsg_nxthdr(msg, cmsg);
}
}

extern (D) inout(cmsghdr)* CMSG_FIRSTHDR( inout(msghdr)* mhdr ) pure nothrow @nogc
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