valloc(3)                  Library Functions Manual                  valloc(3)

NAME
       valloc - page-aligned memory allocation

LIBRARY
       Standard C library (libc, -lc)

SYNOPSIS
       #include <stdlib.h>

       [[deprecated]] void *valloc(size_t size);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       valloc():
           Since glibc 2.12:
               (_XOPEN_SOURCE >= 500) && !(_POSIX_C_SOURCE >= 200112L)
                   || /* glibc >= 2.19: */ _DEFAULT_SOURCE
                   || /* glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
           Before glibc 2.12:
               _BSD_SOURCE || _XOPEN_SOURCE >= 500

DESCRIPTION
       valloc() allocates size bytes and returns a pointer to the allocated
       memory.  The memory address will be a multiple of the page size.

       It is equivalent to memalign(sysconf(_SC_PAGESIZE),size).

ATTRIBUTES
       For an explanation of the terms used in this section, see
       attributes(7).

       +-------------------------------------+---------------+----------------+
       |Interface                            | Attribute     | Value          |
       +-------------------------------------+---------------+----------------+
       |valloc ()                            | Thread safety | MT-Unsafe init |
       +-------------------------------------+---------------+----------------+
VERSIONS
       According to SUSv2, valloc() is declared in <stdlib.h>.  glibc declares
       it in <malloc.h>, and also in <stdlib.h> if suitable feature test
       macros are defined (see above).

STANDARDS
       BSD, GNU.

HISTORY
       glibc 2.0.  3.0BSD.  Documented as obsolete in 4.3BSD, and as legacy in
       SUSv2.

CAVEATS
       See memalign(3).

SEE ALSO
       memalign(3)

Linux man-pages 6.19              2025-12-13                         valloc(3)