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ALLOCA(3) BSD Library Functions Manual ALLOCA(3)
alloca -- memory allocator
Standard C Library (libc, -lc)
The alloca() function allocates size bytes of space in the stack frame of the caller. This
temporary space is automatically freed on return.
The alloca() function returns a pointer to the beginning of the allocated space. If the
allocation failed, a NULL pointer is returned.
brk(2), calloc(3), getpagesize(3), malloc(3), realloc(3)
Few limitations can be mentioned:
o The alloca() function is machine dependent; its use is discouraged.
o The alloca() function is slightly unsafe because it cannot ensure that the pointer
returned points to a valid and usable block of memory. The allocation made may exceed
the bounds of the stack, or even go further into other objects in memory, and alloca()
cannot determine such an error. Avoid alloca() with large unbounded allocations.
o Since alloca() modifies the stack at runtime, it causes problems to certain security
features. See security(7) for a discussion.
BSD March 21, 2011 BSD
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