digitalmars.D - How to define syscall() in freebsd?

Brian (33/33) Jul 12 2018 the code is error:

Joakim (9/45) Jul 12 2018 Just like in C, you cannot declare multiple extern(C) functions

Brian (27/79) Jul 12 2018 I'm sorry, downstairs:

Heromyth (3/6) Jul 12 2018 It should be fine like this:

Brian (4/12) Jul 13 2018 hahaha, thanks MR zhang!

Brian <zoujiaqing gmail.com> writes:

the code is error:
extern (C) nothrow  nogc size_t syscall(size_t ident);
extern (C) nothrow  nogc size_t syscall(size_t ident, size_t 
arg0);
extern (C) nothrow  nogc size_t syscall(size_t ident, long* arg0);

long tid;
syscall(SYS_thr_self, &tid);
writeln(tid);

Error: Function type does not match previously declared function 
with the same mangled name: syscall


Change to:
extern (C) nothrow  nogc size_t syscall(size_t ident);
extern (C) nothrow  nogc size_t syscall(size_t ident, size_t 
arg0);
extern (C) nothrow  nogc size_t syscall(size_t ident, long* arg0);

long tid;
syscall(SYS_thr_self, &tid);
writeln(tid);

Error: none of the overloads of syscall are callable using 
argument types (int, long*), candidates are:
source/app.d(3,33):        kiss.sys.syscall.syscall(ulong ident)
source/app.d(4,33):        kiss.sys.syscall.syscall(ulong ident, 
ulong arg0)



Change to:
// extern (C) nothrow  nogc size_t syscall(size_t ident);
// extern (C) nothrow  nogc size_t syscall(size_t ident, size_t 
arg0);
extern (C) nothrow  nogc size_t syscall(size_t ident, long* arg0);

long tid;
syscall(SYS_thr_self, &tid);
writeln(tid);

result:

100567

Jul 12 2018

Joakim <dlang joakim.fea.st> writes:

On Thursday, 12 July 2018 at 13:55:58 UTC, Brian wrote:
 the code is error:
 extern (C) nothrow  nogc size_t syscall(size_t ident);
 extern (C) nothrow  nogc size_t syscall(size_t ident, size_t 
 arg0);
 extern (C) nothrow  nogc size_t syscall(size_t ident, long* 
 arg0);

 long tid;
 syscall(SYS_thr_self, &tid);
 writeln(tid);

 Error: Function type does not match previously declared 
 function with the same mangled name: syscall

Just like in C, you cannot declare multiple extern(C) functions 
with the same name.

 Change to:
 extern (C) nothrow  nogc size_t syscall(size_t ident);
 extern (C) nothrow  nogc size_t syscall(size_t ident, size_t 
 arg0);
 extern (C) nothrow  nogc size_t syscall(size_t ident, long* 
 arg0);

 long tid;
 syscall(SYS_thr_self, &tid);
 writeln(tid);

What did you change? I see no difference.

 Error: none of the overloads of syscall are callable using 
 argument types (int, long*), candidates are:
 source/app.d(3,33):        kiss.sys.syscall.syscall(ulong ident)
 source/app.d(4,33):        kiss.sys.syscall.syscall(ulong 
 ident, ulong arg0)

Look at the types: the error says you're passing an int and long* 
on 64-bit to functions with different types.

 Change to:
 // extern (C) nothrow  nogc size_t syscall(size_t ident);
 // extern (C) nothrow  nogc size_t syscall(size_t ident, size_t 
 arg0);
 extern (C) nothrow  nogc size_t syscall(size_t ident, long* 
 arg0);

 long tid;
 syscall(SYS_thr_self, &tid);
 writeln(tid);

 result:

 100567

Probably related to first issue mentioned- you cannot overload C 
functions- maybe the compiler finds the third now that you 
removed the disallowed overloads.

Jul 12 2018

Brian <zoujiaqing gmail.com> writes:

On Thursday, 12 July 2018 at 15:45:41 UTC, Joakim wrote:
 On Thursday, 12 July 2018 at 13:55:58 UTC, Brian wrote:
 the code is error:
 extern (C) nothrow  nogc size_t syscall(size_t ident);
 extern (C) nothrow  nogc size_t syscall(size_t ident, size_t 
 arg0);
 extern (C) nothrow  nogc size_t syscall(size_t ident, long* 
 arg0);

 long tid;
 syscall(SYS_thr_self, &tid);
 writeln(tid);

 Error: Function type does not match previously declared 
 function with the same mangled name: syscall

 Just like in C, you cannot declare multiple extern(C) functions 
 with the same name.

 Change to:
 extern (C) nothrow  nogc size_t syscall(size_t ident);
 extern (C) nothrow  nogc size_t syscall(size_t ident, size_t 
 arg0);
 extern (C) nothrow  nogc size_t syscall(size_t ident, long* 
 arg0);

 long tid;
 syscall(SYS_thr_self, &tid);
 writeln(tid);

 What did you change? I see no difference.

 Error: none of the overloads of syscall are callable using 
 argument types (int, long*), candidates are:
 source/app.d(3,33):        kiss.sys.syscall.syscall(ulong 
 ident)
 source/app.d(4,33):        kiss.sys.syscall.syscall(ulong 
 ident, ulong arg0)

 Look at the types: the error says you're passing an int and 
 long* on 64-bit to functions with different types.

 Change to:
 // extern (C) nothrow  nogc size_t syscall(size_t ident);
 // extern (C) nothrow  nogc size_t syscall(size_t ident, 
 size_t arg0);
 extern (C) nothrow  nogc size_t syscall(size_t ident, long* 
 arg0);

 long tid;
 syscall(SYS_thr_self, &tid);
 writeln(tid);

 result:

 100567

 Probably related to first issue mentioned- you cannot overload 
 C functions- maybe the compiler finds the third now that you 
 removed the disallowed overloads.

I'm sorry, downstairs:
the code is error:
extern (C) nothrow  nogc size_t syscall(size_t ident);
extern (C) nothrow  nogc size_t syscall(size_t ident, size_t 
arg0);
extern (C) nothrow  nogc size_t syscall(size_t ident, long* arg0);

long tid;
syscall(SYS_thr_self, &tid);
writeln(tid);

Error: Function type does not match previously declared function 
with the same mangled name: syscall


Change to:
extern (C) nothrow  nogc size_t syscall(size_t ident);
extern (C) nothrow  nogc size_t syscall(size_t ident, size_t 
arg0);

long tid;
syscall(SYS_thr_self, &tid);
writeln(tid);

Error: none of the overloads of syscall are callable using 
argument types (int, long*), candidates are:
source/app.d(3,33):        kiss.sys.syscall.syscall(ulong ident)
source/app.d(4,33):        kiss.sys.syscall.syscall(ulong ident, 
ulong arg0)

freebsd syscall()
https://www.freebsd.org/cgi/man.cgi?query=syscall&sektion=2

How to define it in D?

Jul 12 2018

Heromyth <bitworld qq.com> writes:

On Thursday, 12 July 2018 at 20:19:17 UTC, Brian wrote:
 freebsd syscall()
 https://www.freebsd.org/cgi/man.cgi?query=syscall&sektion=2

 How to define it in D?

It should be fine like this:

extern (C) nothrow  nogc size_t syscall(size_t ident, ...);

Jul 12 2018

Brian <zoujiaqing gmail.com> writes:

On Friday, 13 July 2018 at 02:56:23 UTC, Heromyth wrote:
 On Thursday, 12 July 2018 at 20:19:17 UTC, Brian wrote:
 freebsd syscall()
 https://www.freebsd.org/cgi/man.cgi?query=syscall&sektion=2

 How to define it in D?

 It should be fine like this:

 extern (C) nothrow  nogc size_t syscall(size_t ident, ...);

hahaha, thanks MR zhang!

kiss.sys.syscall module is resolved.

https://github.com/huntlabs/kiss/blob/master/source/kiss/sys/syscall/package.d

Jul 13 2018

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digitalmars.D - How to define syscall() in freebsd?