alloca(3) - NetBSD Manual Pages

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ALLOCA(3)               NetBSD Library Functions Manual              ALLOCA(3)


NAME
alloca -- memory allocator
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h> void * alloca(size_t size);
DESCRIPTION
The alloca() function allocates size bytes of space in the stack frame of the caller. This temporary space is automatically freed on return.
RETURN VALUES
The alloca() function returns a pointer to the beginning of the allocated space. If the allocation failed, a NULL pointer is returned.
SEE ALSO
brk(2), calloc(3), getpagesize(3), malloc(3), realloc(3)
BUGS
The alloca() function is machine dependent; its use is discouraged. 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. NetBSD 5.0 August 11, 2002 NetBSD 5.0
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