From 4945adc1fffd0641a0a273bcedeb52f3bba653bf Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Mon, 20 Oct 2025 08:36:07 +0000
Subject:  More sysdeps

---
 configure                            |  3 +++
 src/sysdeps/trykevent.c              | 19 +++++++++++++++++++
 src/sysdeps/trypidfd_open.c          |  9 +++++++++
 src/sysdeps/tryprsetchildsubreaper.c | 12 ++++++++++++
 4 files changed, 43 insertions(+)
 create mode 100644 src/sysdeps/trykevent.c
 create mode 100644 src/sysdeps/trypidfd_open.c
 create mode 100644 src/sysdeps/tryprsetchildsubreaper.c

diff --git a/configure b/configure
index 53b5194..9f89a61 100755
--- a/configure
+++ b/configure
@@ -717,6 +717,9 @@ choose cl kernprocpathname 'the KERN_PROC_PATHNAME sysctl'
 choose cl _nsgetexecutablepath '_NSGetExecutablePath()'
 choose cl getexecname 'getexecname()'
 choose cl dladdr 'dladdr()'
+choose c pidfd_open 'pidfd_open()'
+choose cl kevent 'kevent()'
+choose cl prsetchildsubreaper 'PR_SET_CHILD_SUBREAPER'
 
 # Here are the evil irreducible run-time sysdeps.
 choose clr devurandom '/dev/urandom'
diff --git a/src/sysdeps/trykevent.c b/src/sysdeps/trykevent.c
new file mode 100644
index 0000000..8c54f4d
--- /dev/null
+++ b/src/sysdeps/trykevent.c
@@ -0,0 +1,19 @@
+/* ISC license. */
+
+#undef _POSIX_C_SOURCE
+#undef _XOPEN_SOURCE
+
+#include <sys/types.h>
+#include <sys/event.h>
+#include <sys/time.h>
+#include <unistd.h>
+
+int main (void)
+{
+  int q = kqueue() ;
+  struct kevent ke ;
+  struct timespec ts = { .tv_sec = 1, .tv_nsec = 0 } ;
+  EV_SET(&ke, getpid(), EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, 0) ;
+  kevent(q, &ke, 1, &ke, 1, &ts) ;
+  return 0 ;
+}
diff --git a/src/sysdeps/trypidfd_open.c b/src/sysdeps/trypidfd_open.c
new file mode 100644
index 0000000..8840742
--- /dev/null
+++ b/src/sysdeps/trypidfd_open.c
@@ -0,0 +1,9 @@
+/* ISC license. */
+
+#undef _POSIX_C_SOURCE
+#undef _XOPEN_SOURCE
+
+#include <sys/syscall.h>
+#include <unistd.h>
+
+static long a = SYS_pidfd_open ;
diff --git a/src/sysdeps/tryprsetchildsubreaper.c b/src/sysdeps/tryprsetchildsubreaper.c
new file mode 100644
index 0000000..6a65691
--- /dev/null
+++ b/src/sysdeps/tryprsetchildsubreaper.c
@@ -0,0 +1,12 @@
+/* ISC license. */
+
+#undef _POSIX_C_SOURCE
+#undef _XOPEN_SOURCE
+
+#include <sys/prctl.h>
+
+int main (void)
+{
+  prctl(PR_SET_CHILD_SUBREAPER, 1) ;
+  return 0 ;
+}
-- 
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