Add a pselect(2) shim for systems that lack support for it.

When building, warn that it's not entirely race condition safe.

1 files changed, 25 insertions, 0 deletions

diff --git a/configure b/configure
index 233f23c1..32a4dfd0 100755
--- a/configure
+++ b/configure
@@ -50,6 +50,8 @@ for x do
 	--without-closefrom) CLOSEFROM=no;;
 	--without-getline) GETLINE=no;;
 	--without-strlcpy) STRLCPY=no;;
+        --without-posix_spawn) POSIX_SPAWN=no;;
+        --without-pselect) PSELECT=no;;
 	--serviceexists) SERVICEEXISTS=$var;;
 	--servicecmd) SERVICECMD=$var;;
 	--servicestatus) SERVICESTATUS=$var;;
@@ -437,6 +439,29 @@ else
 	echo "#include <spawn.h>" >>$CONFIG_H
 fi
 
+if [ -z "$PSELECT" ]; then
+	printf "Testing for pselect ... "
+	cat <<EOF >_pselect.c
+#include <sys/select.h>
+#include <stdlib.h>
+int main(void) {
+	pselect(0, NULL, NULL, NULL, NULL, NULL);
+	return 0;
+}
+EOF
+	if $XCC _pselect.c -o _pselect 2>/dev/null; then
+		PSELECT=yes
+	else
+		PSELECT=no
+	fi
+	echo "$PSELECT"
+	rm -f _pselect.c _pselect
+fi
+if [ "$PSELECT" = no ]; then
+	echo "COMPAT_SRCS+=	compat/pselect.c" >>$CONFIG_MK
+	echo "#include \"compat/pselect.h\"" >>$CONFIG_H
+fi
+
 if [ -z "$SERVICECMD" ]; then
 	printf "Checking for OpenRC ... "
 	if [ -x /sbin/rc-service ]; then