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Command: alloca | Section: 3 | Source: OpenBSD | File: alloca.3
ALLOCA(3) FreeBSD Library Functions Manual ALLOCA(3)
NAME
alloca - memory allocator
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.
SEE ALSO
pagesize(1), brk(2), malloc(3)
CAVEATS
The alloca() function is 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.
FreeBSD 14.1-RELEASE-p8 January 17, 2015 FreeBSD 14.1-RELEASE-p8