Replace ashmem backend with memfd_create (runtime fallback)#21

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ClaudeCode-Termux wants to merge 13 commits into

termux:masterfrom

ClaudeCode-Termux:memfd-backend

Commits on Jun 28, 2026

Replace ashmem backend with memfd_create
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Keep backward compatibility: memfd (API 30+) + ashmem (API <30)
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Runtime fallback: memfd → ASharedMemory → /dev/ashmem
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Use memfd_create() libc wrapper instead of hardcoded syscall 279
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Fix API 24 compat: use syscall(__NR_memfd_create) with arch fallback
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Fix shmem_get_size_region: fstat returns st_size=0 for ashmem fds
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Use dlopen/dlsym for ASharedMemory instead of compile-time #if
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Replace dlopen with __ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__
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Drop custom __NR_memfd_create arch table, save errno on error
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Remove redundant MFD_* defines and device-specific comment
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Add dma-buf heap and ion fallback backends
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Remove non-functional dma_heap and ion backends
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Reorder backends: ASharedMemory → /dev/ashmem → memfd_create
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