From 3c50e6cf145ef8e9d661a80d40e85bceefca7dfa Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Wed, 24 Apr 2024 23:38:14 -0400
Subject: build: Export some sys/*.h headers

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 Makefile.in          |  1 +
 builddeps/sysexports | 10 ++++++++++
 lib/libc/.gitignore  |  2 ++
 lib/libc/Makefile    |  2 ++
 tools/sysexport      | 32 ++++++++++++++++++++++++++++++++
 5 files changed, 47 insertions(+)
 create mode 100644 builddeps/sysexports
 create mode 100755 tools/sysexport

diff --git a/Makefile.in b/Makefile.in
index eb53811..331554d 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -92,6 +92,7 @@ base:
 
 .PHONY: lib
 lib:
+	bash tools/sysexport
 	cd lib/; make $(USER_MKFLGS)
 	cp lib/libc/build/libc.a base/usr/lib/
 
diff --git a/builddeps/sysexports b/builddeps/sysexports
new file mode 100644
index 0000000..4c0f0e1
--- /dev/null
+++ b/builddeps/sysexports
@@ -0,0 +1,10 @@
+# Sys header export list
+# Add headers to be exported to userland here
+# Example: foo.h corresponds to sys/include/sys/foo.h
+sys_headers=$(cat <<END
+    fbdev.h
+    errno.h
+    queue.h
+    signal.h
+END
+)
diff --git a/lib/libc/.gitignore b/lib/libc/.gitignore
index 567609b..87705f8 100644
--- a/lib/libc/.gitignore
+++ b/lib/libc/.gitignore
@@ -1 +1,3 @@
 build/
+include/sys/.gitignore
+include/sys/.sys_export
diff --git a/lib/libc/Makefile b/lib/libc/Makefile
index 927c177..6eeb9f3 100644
--- a/lib/libc/Makefile
+++ b/lib/libc/Makefile
@@ -31,3 +31,5 @@ build/:
 clean:
 	rm -f $(LIBC_OBJ) $(LIBC_ASMOBJ)
 	rm -rf build/
+	rm -f $(shell cat include/sys/.sys_export)
+	rm include/sys/.sys_export include/sys/.gitignore
diff --git a/tools/sysexport b/tools/sysexport
new file mode 100755
index 0000000..8426e8d
--- /dev/null
+++ b/tools/sysexport
@@ -0,0 +1,32 @@
+#!/bin/bash
+#
+# To be ran during the build process to export
+# system headers
+#
+
+TARGET_DIR=lib/libc/include/sys
+SYS_DIR=../../../../sys/include/sys
+
+if [ -f $TARGET_DIR/.sys_export ]
+then
+    exit 0
+fi
+
+. builddeps/sysexports
+
+echo "Exporting sys headers..."
+cd $TARGET_DIR
+
+for i in $sys_headers
+do
+    if [ -s "$i" ]
+    then
+        echo "HEADER CONFLICT ($TARGET_DIR/$i)"
+        continue
+    fi
+
+    echo "sys/include/sys/$i -> lib/libc/include/sys/$i"
+    echo include/sys/$i >>.sys_export
+    echo "$i" >>.gitignore
+    ln -sf $SYS_DIR/$i .
+done
-- 
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