59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
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// hakmem_syscall.h - System call wrapper (bypasses LD_PRELOAD)
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//
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// Purpose: Direct libc access via dlsym to avoid LD_PRELOAD recursion
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//
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// Box Theory - Layer 3 (Syscall Layer):
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// This module implements "Box 3" in the 3-layer architecture:
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// Box 1 (API) → Box 2 (Core) → Box 3 (Syscall - THIS MODULE)
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// ↑ Bypasses LD_PRELOAD!
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//
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// Design Philosophy:
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// - Use dlsym(RTLD_NEXT, "malloc") to get real libc functions
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// - Completely bypass LD_PRELOAD wrappers (no recursion possible)
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// - No guard needed (g_in_internal_malloc removed!)
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// - Called ONLY by Box 2 (hakmem core) for internal allocations
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//
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// Usage:
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// - Slab/Page allocation in Tiny/Mid/Large pools
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// - Learner policy allocation
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// - Any hakmem internal structure
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//
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// Safety:
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// - Must call hkm_syscall_init() BEFORE any allocation
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// - Will abort() if dlsym fails
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//
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// License: MIT
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// Date: 2025-10-24
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#ifndef HAKMEM_SYSCALL_H
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#define HAKMEM_SYSCALL_H
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#include <stddef.h>
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// Initialize syscall layer (dlsym to get real libc functions)
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// Must be called from hak_init() before any allocation
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// This function is idempotent (safe to call multiple times)
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void hkm_syscall_init(void);
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// Direct libc malloc (bypasses LD_PRELOAD completely)
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// Returns: Pointer to allocated memory, or NULL on failure
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// Usage: Internal allocations ONLY (Slab/Page/Learner)
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//
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// Example:
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// TinySlab* slab = (TinySlab*)hkm_libc_malloc(sizeof(TinySlab));
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void* hkm_libc_malloc(size_t size);
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// Direct libc calloc (bypasses LD_PRELOAD completely)
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// Returns: Pointer to zero-initialized memory, or NULL on failure
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void* hkm_libc_calloc(size_t nmemb, size_t size);
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// Direct libc free (bypasses LD_PRELOAD completely)
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// Args: ptr - pointer to free (can be NULL)
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void hkm_libc_free(void* ptr);
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// Direct libc realloc (bypasses LD_PRELOAD completely)
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// Returns: Pointer to reallocated memory, or NULL on failure
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void* hkm_libc_realloc(void* ptr, size_t size);
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#endif // HAKMEM_SYSCALL_H
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