[Buildroot] [PATCH] package/procps-ng: fix build without __NR_pidfd_open and pidfd_open() found

[Scott Fan <fancp2007@gmail.com>]

Backport patch from upstream:
https://gitlab.com/procps-ng/procps/-/commit/2507bc475782ff5e0541d37c780dff1e293c9553

Add new configure option, allow disable build pidwait explicitly to avoid errors.

Signed-off-by: Scott Fan <fancp2007@gmail.com>
---
 ...03-build-sys-Fix-pidfd_open-checking.patch | 99 +++++++++++++++++++
 package/procps-ng/Config.in                   |  8 ++
 package/procps-ng/procps-ng.mk                |  5 +
 3 files changed, 112 insertions(+)
 create mode 100644 package/procps-ng/0003-build-sys-Fix-pidfd_open-checking.patch

diff --git a/package/procps-ng/0003-build-sys-Fix-pidfd_open-checking.patch b/package/procps-ng/0003-build-sys-Fix-pidfd_open-checking.patch
new file mode 100644
index 0000000000..bf89a07a20
--- /dev/null
+++ b/package/procps-ng/0003-build-sys-Fix-pidfd_open-checking.patch
@@ -0,0 +1,99 @@
+From ae7b0eb069f4add363e8c4d01833a06c3f5ee842 Mon Sep 17 00:00:00 2001
+From: Craig Small <csmall@dropbear.xyz>
+Date: Mon, 30 Sep 2024 17:26:01 +1000
+Subject: [PATCH] build-sys: Fix pidfd_open checking
+
+The previous build setup would check for pidfd_open using
+AC_CHECK_FUNC and would be incorrectly reported as true.
+
+Also, if pidfd_open() and __NR_pidfd_open were not present,
+pidwait would silently not be built.
+
+So, changes:
+ compile a small programin using pidfd_open to test it properly
+ conditionally try to find NR_pidfd_open if the function fails
+ complain if neither are present
+ have --disable-pidwait configure option so you are explicit in
+ not wanting and knowing you wont get pidwait
+
+References:
+ #352
+ commit d9c3e3676d86094abaa239b3218f57bf49d70b4f
+ commit 17f94796a9b3c4f1ff28829107a82107dcb362b4
+
+Signed-off-by: Craig Small <csmall@dropbear.xyz>
+
+Upstream: https://gitlab.com/procps-ng/procps/-/commit/2507bc475782ff5e0541d37c780dff1e293c9553
+
+Signed-off-by: Scott Fan <fancp2007@gmail.com>
+[Scott: backported to version 4.0.4]
+---
+ configure.ac | 45 ++++++++++++++++++++++++++++++---------------
+ 1 file changed, 30 insertions(+), 15 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index fec27e3f..0719fcd1 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -170,21 +170,6 @@ AC_TRY_COMPILE([#include <errno.h>],
+ 		AC_MSG_RESULT(yes),
+ 		AC_MSG_RESULT(no))
+ 
+-AC_CHECK_FUNC([pidfd_open], [enable_pidwait=yes], [
+-  AC_MSG_CHECKING([for __NR_pidfd_open])
+-  AC_COMPILE_IFELSE([AC_LANG_SOURCE([
+-#include <sys/syscall.h>
+-#ifndef __NR_pidfd_open
+-#error __NR_pidfd_open not defined
+-#endif
+-    ])], [enable_pidwait=yes], [enable_pidwait=no])
+-  AC_MSG_RESULT([$enable_pidwait])
+-])
+-if test "$enable_pidwait" = yes; then
+-  AC_DEFINE([ENABLE_PIDWAIT], [1], [Enable pidwait])
+-fi
+-AM_CONDITIONAL([BUILD_PIDWAIT], [test x$enable_pidwait = xyes])
+-
+ dnl watch8bit must be before the AC_ARG_WITH set as it sets up ncurses
+ AC_SUBST([WITH_WATCH8BIT])
+ AC_ARG_ENABLE([watch8bit],
+@@ -321,6 +306,36 @@ AC_ARG_ENABLE([pidof],
+ )
+ AM_CONDITIONAL(BUILD_PIDOF, test "x$enable_pidof" = xyes)
+ 
++# If pidwait is enabled, we need either pidfd_open() or __NR_pidfd_open need to be defined
++# Cannot use AC_CHECK_FUNC as it (incorrectly) passes with pidfd_open missing
++AC_ARG_ENABLE([pidwait],
++  AS_HELP_STRING([--disable-pidwait], [do not build pidwait]),
++  [], [
++    enable_pidwait=yes
++    AC_DEFINE(ENABLE_PIDWAIT, 1, [enable pidwait])
++  ]
++)
++AM_CONDITIONAL(BUILD_PIDWAIT, test "x$enable_pidwait" = xyes)
++AC_MSG_CHECKING([for pidfd_open()])
++AC_LINK_IFELSE([AC_LANG_PROGRAM([], [[ [pidfd_open(1,1)]]])],
++  have_pidfd_open=yes; AC_MSG_RESULT([yes]) ,
++  have_pidfd_open=no; AC_MSG_RESULT([no])
++  )
++
++AS_IF([[test "x$enable_pidwait" = xyes -a "x$have_pidfd_open" = xno]],
++   AC_MSG_CHECKING([for __NR_pidfd_open])
++   AC_COMPILE_IFELSE([AC_LANG_SOURCE([
++#include <sys/syscall.h>
++#ifndef __NR_pidfd_open
++#error __NR_pidfd_open not defined
++#endif
++      ])],
++      AC_MSG_RESULT([yes]),
++      AC_MSG_RESULT([no])
++      AC_MSG_ERROR([Neither pidfd_open or __NR_pidfd_open found. Disable pidwait with configure option --disable-pidwait])
++    )
++   ,[])
++
+ AC_ARG_ENABLE([kill],
+   AS_HELP_STRING([--disable-kill], [do not build kill]),
+   [], [enable_kill=yes]
+-- 
+2.43.0
+
diff --git a/package/procps-ng/Config.in b/package/procps-ng/Config.in
index 7af0e97fb4..17bc437fff 100644
--- a/package/procps-ng/Config.in
+++ b/package/procps-ng/Config.in
@@ -17,4 +17,12 @@ config BR2_PACKAGE_PROCPS_NG_ORIGINAL_TOP
 	  Disable modern top layout, return to original top with
 	  detailed cpu usage.
 
+config BR2_PACKAGE_PROCPS_NG_DISABLE_PIDWAIT
+	bool "Do not build pidwait"
+	help
+	  Disable pidwait with configure option --disable-pidwait
+	  explicitly. If pidwait is enabled, we need either pidfd_open()
+	  or __NR_pidfd_open need to be defined, the option can avoid
+	  errors when the condition is not met.
+
 endif
diff --git a/package/procps-ng/procps-ng.mk b/package/procps-ng/procps-ng.mk
index c5185c2c8a..2db638c508 100644
--- a/package/procps-ng/procps-ng.mk
+++ b/package/procps-ng/procps-ng.mk
@@ -16,6 +16,7 @@ PROCPS_NG_CONF_OPTS = LIBS=$(TARGET_NLS_LIBS)
 
 # Applying 0001-build-sys-Add-systemd-elogind-to-w.patch touches Makefile.am
 # Applying 0002-fix-ncurses-h-include.patch touches configure.ac
+# Applying 0003-build-sys-Fix-pidfd_open-checking.patch touches configure.ac
 PROCPS_NG_AUTORECONF = YES
 
 ifeq ($(BR2_PACKAGE_SYSTEMD),y)
@@ -60,6 +61,10 @@ ifeq ($(BR2_PACKAGE_PROCPS_NG_ORIGINAL_TOP),y)
 PROCPS_NG_CONF_OPTS += --disable-modern-top
 endif
 
+ifeq ($(BR2_PACKAGE_PROCPS_NG_DISABLE_PIDWAIT),y)
+PROCPS_NG_CONF_OPTS += --disable-pidwait
+endif
+
 # Avoid installing S02sysctl, since openrc provides /etc/init.d/sysctl.
 define PROCPS_NG_INSTALL_INIT_OPENRC
 	@:
-- 
2.43.0

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