MEMALIGNMENT(3) Library Functions Manual MEMALIGNMENT(3) NAME memalignment -- find the memory alignment of an object SYNOPSIS Standard C Library (libc, -lc) #include <stdlib.h> size_t memalignment(const void *ptr); DESCRIPTION The memalignment() function determines the alignment of the object pointed to by ptr. This alignment is a power of 2, and may be larger than the range supported by the alignof operator. The value returned can be com- pared to the result of alignof, and if it is greater or equal, the align- ment requirement of the operand is satisfied. RETURN VALUES Returns the alignment of ptr as a power of 2. If ptr is a null pointer, an alignment of zero is returned. An alignment of zero indicates that the tested pointer cannot be used to access an object of any type. SEE ALSO aligned_alloc(3), posix_memalign(3) STANDARDS The memalignment() function conforms to ISO/IEC 9899:2024 ("ISO C23"). HISTORY The memalignment() function was added in FreeBSD 15.1. AUTHOR Robert Clausecker <fuz@FreeBSD.org> FreeBSD 15.1 November 10, 2025 MEMALIGNMENT(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS | HISTORY | AUTHOR
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=memalignment&sektion=3&manpath=FreeBSD+15.1-RELEASE+and+Ports.quarterly>