[issue26836] Add memfd_create to os module

[Pedro Lacerda]

Pedro Lacerda added the comment:

Maybe useful at mmapmodule.c replacing

        /* SVR4 method to map anonymous memory is to open /dev/zero */
        fd = devzero = _Py_open("/dev/zero", O_RDWR);

tagname is unused at UNIX version of new_mmap_object() so if provided something like could be added for Linux only
        fd = memfd_create(tagname, O_RDWR);

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nosy: +Pedro Lacerda

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