MirBSD manpage: alloca(3)

ALLOCA(3)                  BSD Programmer's Manual                   ALLOCA(3)


     alloca - memory allocator


     #include <stdlib.h>

     void *
     alloca(size_t size);


     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


     pagesize(1), brk(2), calloc(3), malloc(3), realloc(3)


     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 er-
     ror. Avoid alloca() with large unbounded allocations.

MirBSD #10-current               May 2, 1991                                 1

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