There is no point in doing this.

getpagesize() is never going away, because it has no risks.  This is
not strcpy() or gets().

Secondly, everyone despises hates sysconf.

> Hello,
> 
> The current version of ps(1) still uses the obsolete getpagesize()
> function. Following the recommendation in getpagesize(3), this patch
> migrates the code to sysconf(_SC_PAGESIZE).
> 
> I have updated the 'pagesize' variable to a 'long' to match the
> return type of sysconf() and ensure consistency in memory
> calculations within the pgtok() macro.
> 
> Tested on OpenBSD 7.8 x86_64.
> 
> Index: bin/ps/extern.h
> --- bin/ps/extern.h
> +++ bin/ps/extern.h
> @@ -38,7 +38,7 @@
> 
>  extern struct varent var[];
>  extern int eval;
> -extern int pagesize;
> +extern long pagesize;
>  extern int termwidth;
>  extern int totwidth;
> 
> Index: bin/ps/ps.c
> --- bin/ps/ps.c
> +++ bin/ps/ps.c
> @@ -58,7 +58,7 @@
> 
>  struct varent var[];
>  int    eval;
> -int    pagesize;
> +long    pagesize;
>  int    termwidth;
>  int    totwidth;
>  int    needenv, needuser, oneline;
> @@ -204,7 +204,9 @@
>      if (setlocale(LC_CTYPE, "") == NULL)
>          warnx("invalid locale");
> 
> -    pagesize = getpagesize();
> +    pagesize = sysconf(_SC_PAGESIZE);
> +    if (pagesize == -1)
> +        err(1, "sysconf _SC_PAGESIZE");
> 
>      while ((ch = getopt(argc, argv, getoptstr)) != -1) {
>          switch (ch) {
>