From 6a38159c38e06a9ceae166cc223c08d9f4241018 Mon Sep 17 00:00:00 2001
From: Francois Kritzinger <francois@codesynthesis.com>
Date: Wed, 17 Jan 2024 16:02:16 +0200
Subject: [PATCH] Add HAVE_POSIX_SHM and HAVE_POSIX_SEM

---
 .../autoconf/checks/HAVE_POSIX_SEM.h          | 24 ++++++++++++++++++
 .../autoconf/checks/HAVE_POSIX_SHM.h          | 25 +++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_POSIX_SEM.h
 create mode 100644 libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_POSIX_SHM.h

diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_POSIX_SEM.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_POSIX_SEM.h
new file mode 100644
index 0000000..37e44e7
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_POSIX_SEM.h
@@ -0,0 +1,24 @@
+// HAVE_POSIX_SEM : BUILD2_AUTOCONF_LIBC_VERSION
+
+/* If HAVE_POSIX_SEM is defined then all of the POSIX semaphore system calls
+ * such as sem_open(), sem_close(), sem_unlink(), etc. are available.
+ */
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_POSIX_SEM
+
+/* Since glibc 2.3.3 (when NPTL was added), FreeBSD 3.0, OpenBSD 3.1 (based on
+ * checking the online manpages by version), and NetBSD 2.0.
+ *
+ * Available on all versions of macOS.
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 4)     || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(3, 0)   || \
+    BUILD2_AUTOCONF_OPENBSD_PREREQ(200206) || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(2, 0)    || \
+    defined(BUILD2_AUTOCONF_MACOS)
+#  define HAVE_POSIX_SEM 1
+#endif
diff --git a/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_POSIX_SHM.h b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_POSIX_SHM.h
new file mode 100644
index 0000000..76a151a
--- /dev/null
+++ b/libbuild2-autoconf/libbuild2/autoconf/checks/HAVE_POSIX_SHM.h
@@ -0,0 +1,25 @@
+// HAVE_POSIX_SHM : BUILD2_AUTOCONF_LIBC_VERSION
+
+/* If HAVE_POSIX_SHM is defined then both shm_open() and shm_unlink() are
+ * available.
+ */
+
+#ifndef BUILD2_AUTOCONF_LIBC_VERSION
+#  error BUILD2_AUTOCONF_LIBC_VERSION appears to be conditionally included
+#endif
+
+#undef HAVE_POSIX_SHM
+
+/* Since glibc 2.2, FreeBSD 4.3, and NetBSD 7.0.
+ *
+ * Available on all versions of macOS.
+ *
+ * Not available on OpenBSD (security concerns).
+ *
+ */
+#if BUILD2_AUTOCONF_GLIBC_PREREQ(2, 2)   || \
+    BUILD2_AUTOCONF_FREEBSD_PREREQ(4, 3) || \
+    BUILD2_AUTOCONF_NETBSD_PREREQ(7, 0)  || \
+    defined(BUILD2_AUTOCONF_MACOS)
+#  define HAVE_POSIX_SHM 1
+#endif