Add support for socket activation via systemd

This prevents the need for starting fcgiwrap explicitly, or using a
tool such as spawn-fcgi. The type of socket does not matter, we merely
accept a single FD passed from pid 1 and listen on it.

1 files changed, 17 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 899c219..4388cd4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -14,6 +14,7 @@ AC_SUBST([AM_CFLAGS])
 
 # Checks for programs.
 AC_PROG_CC
+PKG_PROG_PKG_CONFIG
 
 # Create the config.h.
 AC_CONFIG_HEADERS([config.h])
@@ -21,6 +22,22 @@ AC_CONFIG_HEADERS([config.h])
 # Checks for libraries.
 AC_CHECK_LIB([fcgi], [FCGX_Init],, [AC_MSG_ERROR([FastCGI library is missing])])
 
+# systemd support.
+AC_ARG_WITH([systemd],
+  AS_HELP_STRING([--with-systemd], [support systemd socket activation]),
+  [], [with_systemd=check])
+have_systemd=no
+if test "x$with_systemd" != "xno"; then
+  PKG_CHECK_MODULES(systemd, [libsystemd-daemon],
+    [AC_DEFINE(HAVE_SYSTEMD, 1, [Define if systemd is available])
+    have_systemd=yes],
+  have_systemd=no)
+  if test "x$have_systemd" = xno -a "x$with_systemd" = xyes; then
+    AC_MSG_ERROR([systemd support requested but libraries not found])
+  fi
+fi
+AM_CONDITIONAL(HAVE_LIBSSL, [test "x$have_systemd" = "xyes"])
+
 # Checks for header files.
 AC_CHECK_HEADERS([fcntl.h],, [AC_MSG_ERROR([fcntl.h header missing])])
 AC_CHECK_HEADERS([limits.h stdlib.h string.h unistd.h],, [AC_MSG_ERROR([at least one important system header file is missing])])