From 14eb43ea8656ada19a7983202f1b186afb96890f Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Thu, 10 Jun 2021 15:12:12 +1000
Subject: [PATCH] meson.build: check for SYS_pidfd_open

---
 config.h.meson | 1 +
 meson.build    | 4 ++++
 test/pwtest.c  | 4 ++++
 3 files changed, 9 insertions(+)

diff --git a/config.h.meson b/config.h.meson
index a9dd827d7..7f9c143bb 100644
--- a/config.h.meson
+++ b/config.h.meson
@@ -475,6 +475,7 @@
 #mesondefine HAVE_MEMFD_CREATE
 #mesondefine HAVE_GETRANDOM
 #mesondefine HAVE_SIGABBREV_NP
+#mesondefine HAVE_PIDFD_OPEN
 
 #mesondefine PIPEWIRE_VERSION_MAJOR
 #mesondefine PIPEWIRE_VERSION_MINOR
diff --git a/meson.build b/meson.build
index 7ecc1bc6a..b49593c64 100644
--- a/meson.build
+++ b/meson.build
@@ -282,6 +282,10 @@ if cc.has_function('sigabbrev_np', prefix : '#include <string.h>', args : [ '-D_
   cdata.set('HAVE_SIGABBREV_NP', 1)
 endif
 
+if cc.get_define('SYS_pidfd_open', prefix : '#include <syscall.h>') != ''
+  cdata.set('HAVE_PIDFD_OPEN', 1)
+endif
+
 systemd = dependency('systemd', required: get_option('systemd'))
 systemd_dep = dependency('libsystemd',required: get_option('systemd'))
 if systemd.found() and systemd_dep.found()
diff --git a/test/pwtest.c b/test/pwtest.c
index 359adad4a..01553c6d5 100644
--- a/test/pwtest.c
+++ b/test/pwtest.c
@@ -812,7 +812,11 @@ static int monitor_test_forked(struct pwtest_test *t, pid_t pid, int read_fds[_F
 	size_t nevents = 0;
 	int r;
 
+#if HAVE_PIDFD_OPEN
 	pidfd = syscall(SYS_pidfd_open, pid, 0);
+#else
+	errno = ENOSYS;
+#endif
 	/* If we don't have pidfd, we use a timerfd to ping us every 20ms */
 	if (pidfd < 0 && errno == ENOSYS) {
 		pidfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);