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digitalmars.D.learn - Can I make system calls directly from D?

reply rempas <rempas tutanota.com> writes:
I just wonder if I'm able to do system calls directly from D or 
If I have to create bindings from "unistd.h" from C
Jul 09 2021
next sibling parent reply Ferhat =?UTF-8?B?S3VydHVsbXXFnw==?= <aferust gmail.com> writes:
On Friday, 9 July 2021 at 08:08:57 UTC, rempas wrote:

 I just wonder if I'm able to do system calls directly from D or 
 If I have to create bindings from "unistd.h" from C


I don't know if it covers what you want but, druntime has those 
definitions:

https://github.com/dlang/druntime/blob/master/src/core/sys/posix/unistd.d

import core.sys.posix.unistd;

... do stuff
Jul 09 2021
parent rempas <rempas tutanota.com> writes:
On Friday, 9 July 2021 at 08:18:51 UTC, Ferhat Kurtulmuş wrote:

 On Friday, 9 July 2021 at 08:08:57 UTC, rempas wrote:

 I just wonder if I'm able to do system calls directly from D 
 or If I have to create bindings from "unistd.h" from C


 I don't know if it covers what you want but, druntime has those 
 definitions:

 https://github.com/dlang/druntime/blob/master/src/core/sys/posix/unistd.d

 import core.sys.posix.unistd;

 ... do stuff


Yep! From my understanding, this is binding from C so at least I 
don't have to make them on my own. Thanks a lot for your time, 
have an amazing day!
Jul 09 2021
prev sibling parent reply Dennis <dkorpel gmail.com> writes:
On Friday, 9 July 2021 at 08:08:57 UTC, rempas wrote:

 I just wonder if I'm able to do system calls directly from D or 
 If I have to create bindings from "unistd.h" from C


If with directly means 'without calling any C function' you can 
use inline assembly:
```D
version(linux)
void rt_sigreturn() {
      version(D_InlineAsm_X86_64) asm {
         naked;
         mov EAX, 15;
         syscall;
     }
}
```
Jul 09 2021
parent rempas <rempas tutanota.com> writes:
On Friday, 9 July 2021 at 08:28:25 UTC, Dennis wrote:

 On Friday, 9 July 2021 at 08:08:57 UTC, rempas wrote:

 I just wonder if I'm able to do system calls directly from D 
 or If I have to create bindings from "unistd.h" from C


 If with directly means 'without calling any C function' you can 
 use inline assembly:
 ```D
 version(linux)
 void rt_sigreturn() {
      version(D_InlineAsm_X86_64) asm {
         naked;
         mov EAX, 15;
         syscall;
     }
 }
 ```


This is the most "direct" way possible. However I should probably 
not mess with assembly at this point and use the built-in D 
header file for unistd. Thanks a lot for your time tho, have a 
great day!
Jul 09 2021