Wrong OS version and struct kevent_t in FreeBSD 13

[dlangBugzillaToGithub]

dee0xeed reported this on 2021-12-21T08:51:17Z

Transfered from https://issues.dlang.org/show_bug.cgi?id=22615

CC List

• dee0xeed

Description

test program:

import std.stdio;
import core.sys.freebsd.config;
import core.sys.freebsd.sys.event;

void main(string[] args) {
    writefln("FreeBSD_version = %s", __FreeBSD_version);
    writefln("sizeof(kevent_t) = %s", kevent_t.sizeof);
}

output:

@bsd:~/d> ./freebsdver
FreeBSD_version = 1104000
sizeof(kevent_t) = 32

actual version

@bsd:~/d> uname -K
1300139

NOTE:

/usr/include/d/dmd/core/sys/freebsd/sys/event.h do contain correct definition of kevent_t for versions 12+ (with ulong[4] ext field), but because of wrong kernel version size of kevent_t is also incorrect.

[dlangBugzillaToGithub]

dee0xeed commented on 2021-12-21T18:28:53Z

@bsd:~/d> dmd --version
DMD64 D Compiler v2.098.0

LDC2 standart library does not have core.sys.freebsd.config module,
but kevent_t.sizeof is also wrong:

bsd:~/d> ldc2 -v
binary    /usr/local/bin/ldc2
version   1.23.0 (DMD v2.093.1, LLVM 10.0.1)
@bsd:~/d> ldc2 freebsdver.d
@bsd:~/d> ./freebsdver 
sizeof(kevent_t) = 32

Must be 64, see exerpt from /usr/include/sys/event.h:

new, 12+:

struct kevent {
        __uintptr_t     ident;          // identifier for this event
        short           filter;         // filter for event
        unsigned short  flags;          // action flags for kqueue
        unsigned int    fflags;         // filter flag value
        __int64_t       data;           // filter data value
        void            *udata;         // opaque user data identifier
        __uint64_t      ext[4];         // extensions
};

old, 11-:

#if defined(_WANT_FREEBSD11_KEVENT)
// Older structure used in FreeBSD 11.x and older.
struct kevent_freebsd11 {
        __uintptr_t     ident;          // identifier for this event
        short           filter;         // filter for event
        unsigned short  flags;
        unsigned int    fflags;
        __intptr_t      data;
        void            *udata;         // opaque user data identifier
};
#endif

[dlangBugzillaToGithub]

dee0xeed commented on 2021-12-21T18:43:56Z

LDC2 stdlib module (/usr/local/include/d/core/sys/freebsd/sys/event.d)
does not contain struct kevent_t for versions 12+ at all, so, "no problem" :)