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VALLOC(3) Library Functions Manual VALLOC(3)

valloc
aligned memory allocation function

#include <unistd.h>
void *
valloc(size_t size);

The valloc() function is obsoleted by the current version of malloc(3), which aligns page-sized and larger allocations, and posix_memalign(3), which allocates memory with a given alignment.
The valloc() function allocates size bytes aligned on a page boundary. It is implemented by calling malloc(3) with a slightly larger request, saving the true beginning of the block allocated, and returning a properly aligned pointer.

The valloc() function returns a pointer to the allocated space if successful; otherwise a null pointer is returned.

malloc(3)

The valloc() function appeared in 3.0BSD.

A vfree() function has not been implemented.
June 5, 2013 OpenBSD-current