On Sun, 8 Dec 2024 13:36:07 +0800
Chris Billington <cbilling...@emulti.net> wrote:
> First steps, getting the program to build, having solved a few type errors I
> have run into the following issue:
> ...
> /home/chris/Downloads/build/ctune/src/datastructure/CircularBuffer.c:36:17:
> warning: call to undeclared function 'syscall'; ISO C99 and later do not
> support implicit function declarations [-Wimplicit-function-declaration]
> long fd = syscall( __NR_memfd_create, name, flags );
> ^
> /home/chris/Downloads/build/ctune/src/datastructure/CircularBuffer.c:36:26:
> error: use of undeclared identifier '__NR_memfd_create'
> long fd = syscall( __NR_memfd_create, name, flags );
> ^
> 1 warning and 1 error generated.
OpenBSD has neither the syscall(2) nor memfd_create(2) functions from
Linux. I would try mkstemp(3) and unlink(2) to create a file
descriptor. That might look like
#ifdef __OpenBSD__
int fd;
char buf [] = "/tmp/mem.XXXXXXXXXX";
fd = mkstemp( buf );
if( fd != -1 )
unlink( buf );
return fd;
#else
long fd = syscall( __NR_memfd_create, name, flags );
...
return cast;
#endif
If mkstemp or unlink aren't declared, then #include <stdlib.h> or
<unistd.h>.
--gkoehler
