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ALLOCA(3)                BSD Library Functions Manual                ALLOCA(3)

NAME
     alloca -- memory allocator

SYNOPSIS
     #include <alloca.h>
     or
     #include <stdlib.h>

     void *
     alloca(size_t size);

DESCRIPTION
     The alloca() macro allocates size bytes of space in the stack frame of the caller.  This temporary
     space is automatically freed on return.

RETURN VALUES
     alloca() returns a pointer to the beginning of the allocated space.

SEE ALSO
     brk(2), calloc(3), getpagesize(3), malloc(3), realloc(3)

HISTORY
     alloca() appeared in Version 32V AT&T UNIX.

BUGS
     alloca() is machine and compiler dependent; its use is discouraged.

     alloca() 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.

     The use of C99 variable-length arrays and alloca() in the same function will cause the lifetime of
     alloca's storage to be limited to the block containing the alloca()

BSD                            September 5, 2006                           BSD