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@@ -0,0 +1,99 @@
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+From f37d178d5c25c547835d054fbb1eda32c25034b3 Mon Sep 17 00:00:00 2001
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+From: Craig Small <csmall@dropbear.xyz>
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+Date: Mon, 30 Sep 2024 17:26:01 +1000
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+Subject: [PATCH] build-sys: Fix pidfd_open checking
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+
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+The previous build setup would check for pidfd_open using
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+AC_CHECK_FUNC and would be incorrectly reported as true.
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+
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+Also, if pidfd_open() and __NR_pidfd_open were not present,
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+pidwait would silently not be built.
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+
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+So, changes:
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+ compile a small programin using pidfd_open to test it properly
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+ conditionally try to find NR_pidfd_open if the function fails
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+ complain if neither are present
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+ have --disable-pidwait configure option so you are explicit in
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+ not wanting and knowing you wont get pidwait
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+
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+References:
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+ #352
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+ commit d9c3e3676d86094abaa239b3218f57bf49d70b4f
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+ commit 17f94796a9b3c4f1ff28829107a82107dcb362b4
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+
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+Signed-off-by: Craig Small <csmall@dropbear.xyz>
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+
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+Upstream: https://gitlab.com/procps-ng/procps/-/commit/2507bc475782ff5e0541d37c780dff1e293c9553
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+
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+Signed-off-by: Scott Fan <fancp2007@gmail.com>
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+[Scott: backported to version 4.0.4]
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+---
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+ configure.ac | 45 ++++++++++++++++++++++++++++++---------------
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+ 1 file changed, 30 insertions(+), 15 deletions(-)
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+
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+diff --git a/configure.ac b/configure.ac
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+index fec27e3f..0719fcd1 100644
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+--- a/configure.ac
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++++ b/configure.ac
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+@@ -170,21 +170,6 @@ AC_TRY_COMPILE([#include <errno.h>],
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+ AC_MSG_RESULT(yes),
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+ AC_MSG_RESULT(no))
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+
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+-AC_CHECK_FUNC([pidfd_open], [enable_pidwait=yes], [
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+- AC_MSG_CHECKING([for __NR_pidfd_open])
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+- AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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+-#include <sys/syscall.h>
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+-#ifndef __NR_pidfd_open
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+-#error __NR_pidfd_open not defined
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+-#endif
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+- ])], [enable_pidwait=yes], [enable_pidwait=no])
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+- AC_MSG_RESULT([$enable_pidwait])
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+-])
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+-if test "$enable_pidwait" = yes; then
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+- AC_DEFINE([ENABLE_PIDWAIT], [1], [Enable pidwait])
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+-fi
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+-AM_CONDITIONAL([BUILD_PIDWAIT], [test x$enable_pidwait = xyes])
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+-
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+ dnl watch8bit must be before the AC_ARG_WITH set as it sets up ncurses
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+ AC_SUBST([WITH_WATCH8BIT])
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+ AC_ARG_ENABLE([watch8bit],
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+@@ -321,6 +306,36 @@ AC_ARG_ENABLE([pidof],
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+ )
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+ AM_CONDITIONAL(BUILD_PIDOF, test "x$enable_pidof" = xyes)
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+
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++# If pidwait is enabled, we need either pidfd_open() or __NR_pidfd_open need to be defined
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++# Cannot use AC_CHECK_FUNC as it (incorrectly) passes with pidfd_open missing
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++AC_ARG_ENABLE([pidwait],
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++ AS_HELP_STRING([--disable-pidwait], [do not build pidwait]),
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++ [], [
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++ enable_pidwait=yes
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++ AC_DEFINE(ENABLE_PIDWAIT, 1, [enable pidwait])
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++ ]
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++)
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++AM_CONDITIONAL(BUILD_PIDWAIT, test "x$enable_pidwait" = xyes)
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++AC_MSG_CHECKING([for pidfd_open()])
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++AC_LINK_IFELSE([AC_LANG_PROGRAM([], [[ [pidfd_open(1,1)]]])],
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++ have_pidfd_open=yes; AC_MSG_RESULT([yes]) ,
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++ have_pidfd_open=no; AC_MSG_RESULT([no])
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++ )
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++
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++AS_IF([[test "x$enable_pidwait" = xyes -a "x$have_pidfd_open" = xno]],
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++ AC_MSG_CHECKING([for __NR_pidfd_open])
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++ AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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++#include <sys/syscall.h>
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++#ifndef __NR_pidfd_open
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++#error __NR_pidfd_open not defined
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++#endif
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++ ])],
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++ AC_MSG_RESULT([yes]),
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++ AC_MSG_RESULT([no])
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++ AC_MSG_ERROR([Neither pidfd_open or __NR_pidfd_open found. Disable pidwait with configure option --disable-pidwait])
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++ )
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++ ,[])
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++
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+ AC_ARG_ENABLE([kill],
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+ AS_HELP_STRING([--disable-kill], [do not build kill]),
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+ [], [enable_kill=yes]
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+--
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+2.43.0
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+
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Scott Fan