[Bug 273966] libprocstat: use elf_getphdrnum() rather than deprecated elf_getphnum()

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 20 Sep 2023 13:18:17 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273966

            Bug ID: 273966
           Summary: libprocstat: use elf_getphdrnum() rather than
                    deprecated elf_getphnum()
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: jcfyecrayz@liamekaens.com

libprocstat should probably be updated to use the non-deprecated
elf_getphdrnum() rather than elf_getphnum() (marked as deprecated).

The implementations are identical in elftoolchain.

elf_getphnum does not exist in elfutils - and has never existed.  The similar
function elf_getshnum() was deprecated in elfutils in favor of elf_getshdrnum()
in 2009.  This deprecation occurred just before elf_getphdrnum() was added -
also in 2009.

This could be merged to all supported FreeBSD versions (i.e., back to 12.x -
and even beyond that).

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