SCX eBPF macro __COMPAT_ENUM_OR_ZERO

v6.12

The __COMPAT_ENUM_OR_ZERO macro returns the value of an enum member or zero if the member is not defined.

Definition

#define __COMPAT_ENUM_OR_ZERO(__type, __ent)        \
({                                                  \
    __type __ret = 0;                               \
    if (bpf_core_enum_value_exists(__type, __ent))  \
        __ret = __ent;                              \
    __ret;                                          \
})

Usage

This macro checks at runtime if the enum member __ent exists in the enum type __type. If it does, it returns the value of the that was known at compile time, or zero. It does not return the value of the enum on the target kernel, if it differs from the value known at compile time.

Example

Docs could be improved

This part of the docs is incomplete, contributions are very welcome