Luna/libc/src/fcntl.cpp

#include <bits/errno-return.h>
#include <fcntl.h>
#include <stdarg.h>
#include <sys/syscall.h>
#include <unistd.h>

extern "C"
{
    int open(const char* path, int flags, ...)
    {
        va_list ap;
        va_start(ap, flags);

        mode_t mode = (mode_t)va_arg(ap, int);

        long rc = syscall(SYS_openat, AT_FDCWD, path, flags, mode);

        va_end(ap);
        __errno_return(rc, int);
    }

    int creat(const char* path, mode_t mode)
    {
        return open(path, O_WRONLY | O_CREAT | O_TRUNC, mode);
    }

    int fcntl(int fd, int cmd, ...)
    {
        va_list ap;
        va_start(ap, cmd);

        uintptr_t arg = (uintptr_t)va_arg(ap, uintptr_t);

        long rc = syscall(SYS_fcntl, fd, cmd, arg);

        va_end(ap);
        __errno_return(rc, int);
    }
}