Function xmlFileOpen 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlFileOpen(
    filename: *const c_char,
) -> *mut c_void

Open a file and return a FILE * I/O context (cast to void *).

UPSTREAM-PARITY

void *xmlFileOpen(const char *filename);

SAFETY

• filename must point to valid NUL-terminated strings (or NULL where the C contract allows) for the lifetime of the call.

The caller must not race this call with concurrent mutation of the same objects from other threads (per-object state is not internally synchronized). Violating any of the above is undefined behavior.

Exercised by the C-API differential courts (courts/suites/data-abi/*-family-probe.c) and the CLI differential courts; those pass byte-for-byte against the upstream oracle.