tree-wide: add a single version of "static const int one = 1"

All over the place we define local variables for the various sockopts
that take a bool-like "int" value. Sometimes they are const, sometimes
static, sometimes both, sometimes neither.

Let's clean this up, introduce a common const variable "const_int_one"
(as well as one matching "const_int_zero") and use it everywhere, all
acorss the codebase.

24 files changed, 104 insertions, 128 deletions

diff --git a/src/basic/socket-label.c b/src/basic/socket-label.c
index 35e14e567c..2698d59aea 100644
--- a/src/basic/socket-label.c
+++ b/src/basic/socket-label.c
@@ -35,7 +35,7 @@ int socket_address_listen(
 
         _cleanup_close_ int fd = -1;
         const char *p;
-        int r, one;
+        int r;
 
         assert(a);
 
@@ -74,26 +74,22 @@ int socket_address_listen(
                                 return -errno;
 
                 if (reuse_port) {
-                        one = 1;
-                        if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &one, sizeof(one)) < 0)
+                        if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &const_int_one, sizeof(const_int_one)) < 0)
                                 log_warning_errno(errno, "SO_REUSEPORT failed: %m");
                 }
 
                 if (free_bind) {
-                        one = 1;
-                        if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &one, sizeof(one)) < 0)
+                        if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &const_int_one, sizeof(const_int_one)) < 0)
                                 log_warning_errno(errno, "IP_FREEBIND failed: %m");
                 }
 
                 if (transparent) {
-                        one = 1;
-                        if (setsockopt(fd, IPPROTO_IP, IP_TRANSPARENT, &one, sizeof(one)) < 0)
+                        if (setsockopt(fd, IPPROTO_IP, IP_TRANSPARENT, &const_int_one, sizeof(const_int_one)) < 0)
                                 log_warning_errno(errno, "IP_TRANSPARENT failed: %m");
                 }
         }
 
-        one = 1;
-        if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0)
+        if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one)) < 0)
                 return -errno;
 
         p = socket_address_get_path(a);
diff --git a/src/basic/util.c b/src/basic/util.c
index 0da963f4af..c4c66cca53 100644
--- a/src/basic/util.c
+++ b/src/basic/util.c
@@ -51,6 +51,9 @@ int saved_argc = 0;
 char **saved_argv = NULL;
 static int saved_in_initrd = -1;
 
+const int const_int_zero = 0;
+const int const_int_one = 1;
+
 size_t page_size(void) {
         static thread_local size_t pgsz = 0;
         long r;
diff --git a/src/basic/util.h b/src/basic/util.h
index 8cba4ed726..32d9380bd9 100644
--- a/src/basic/util.h
+++ b/src/basic/util.h
@@ -232,3 +232,6 @@ int version(void);
 int str_verscmp(const char *s1, const char *s2);
 
 void disable_coredumps(void);
+
+extern const int const_int_zero;
+extern const int const_int_one;
diff --git a/src/core/manager.c b/src/core/manager.c
index 3bef345957..43180ad4e6 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -873,7 +873,6 @@ static int manager_setup_notify(Manager *m) {
         if (m->notify_fd < 0) {
                 _cleanup_close_ int fd = -1;
                 union sockaddr_union sa = {};
-                static const int one = 1;
                 int salen;
 
                 /* First free all secondary fields */
@@ -901,7 +900,7 @@ static int manager_setup_notify(Manager *m) {
                 if (r < 0)
                         return log_error_errno(errno, "bind(%s) failed: %m", m->notify_socket);
 
-                r = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
+                r = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &const_int_one, sizeof(const_int_one));
                 if (r < 0)
                         return log_error_errno(errno, "SO_PASSCRED failed: %m");
 
diff --git a/src/core/socket.c b/src/core/socket.c
index 649904d406..1089ec11f1 100644
--- a/src/core/socket.c
+++ b/src/core/socket.c
@@ -1018,8 +1018,7 @@ static void socket_apply_socket_options(Socket *s, int fd) {
         assert(fd >= 0);
 
         if (s->keep_alive) {
-                int one = 1;
-                if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one)) < 0)
+                if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &const_int_one, sizeof(const_int_one)) < 0)
                         log_unit_warning_errno(UNIT(s), errno, "SO_KEEPALIVE failed: %m");
         }
 
@@ -1048,32 +1047,27 @@ static void socket_apply_socket_options(Socket *s, int fd) {
         }
 
         if (s->no_delay) {
-                int one = 1;
-
                 if (s->socket_protocol == IPPROTO_SCTP) {
-                        if (setsockopt(fd, SOL_SCTP, SCTP_NODELAY, &one, sizeof(one)) < 0)
+                        if (setsockopt(fd, SOL_SCTP, SCTP_NODELAY, &const_int_one, sizeof(const_int_one)) < 0)
                                 log_unit_warning_errno(UNIT(s), errno, "SCTP_NODELAY failed: %m");
                 } else {
-                        if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &one, sizeof(one)) < 0)
+                        if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &const_int_one, sizeof(const_int_one)) < 0)
                                 log_unit_warning_errno(UNIT(s), errno, "TCP_NODELAY failed: %m");
                 }
         }
 
         if (s->broadcast) {
-                int one = 1;
-                if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0)
+                if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_one, sizeof(const_int_one)) < 0)
                         log_unit_warning_errno(UNIT(s), errno, "SO_BROADCAST failed: %m");
         }
 
         if (s->pass_cred) {
-                int one = 1;
-                if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
+                if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &const_int_one, sizeof(const_int_one)) < 0)
                         log_unit_warning_errno(UNIT(s), errno, "SO_PASSCRED failed: %m");
         }
 
         if (s->pass_sec) {
-                int one = 1;
-                if (setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)) < 0)
+                if (setsockopt(fd, SOL_SOCKET, SO_PASSSEC, &const_int_one, sizeof(const_int_one)) < 0)
                         log_unit_warning_errno(UNIT(s), errno, "SO_PASSSEC failed: %m");
         }
 
diff --git a/src/import/importd.c b/src/import/importd.c
index c42b3914aa..7dd00b7545 100644
--- a/src/import/importd.c
+++ b/src/import/importd.c
@@ -584,7 +584,6 @@ static int manager_new(Manager **ret) {
                 .un.sun_family = AF_UNIX,
                 .un.sun_path = "/run/systemd/import/notify",
         };
-        static const int one = 1;
         int r;
 
         assert(ret);
@@ -613,7 +612,7 @@ static int manager_new(Manager **ret) {
         if (bind(m->notify_fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0)
                 return -errno;
 
-        if (setsockopt(m->notify_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
+        if (setsockopt(m->notify_fd, SOL_SOCKET, SO_PASSCRED, &const_int_one, sizeof(const_int_one)) < 0)
                 return -errno;
 
         r = sd_event_add_io(m->event, &m->notify_event_source, m->notify_fd, EPOLLIN, manager_on_notify, m);
diff --git a/src/journal/journald-audit.c b/src/journal/journald-audit.c
index 68d889b5fb..0e0465d879 100644
--- a/src/journal/journald-audit.c
+++ b/src/journal/journald-audit.c
@@ -497,7 +497,6 @@ static int enable_audit(int fd, bool b) {
 }
 
 int server_open_audit(Server *s) {
-        static const int one = 1;
         int r;
 
         if (s->audit_fd < 0) {
@@ -528,7 +527,7 @@ int server_open_audit(Server *s) {
         } else
                 (void) fd_nonblock(s->audit_fd, true);
 
-        r = setsockopt(s->audit_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
+        r = setsockopt(s->audit_fd, SOL_SOCKET, SO_PASSCRED, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return log_error_errno(errno, "Failed to set SO_PASSCRED on audit socket: %m");
 
diff --git a/src/journal/journald-native.c b/src/journal/journald-native.c
index bf1ef64e70..208758785d 100644
--- a/src/journal/journald-native.c
+++ b/src/journal/journald-native.c
@@ -443,7 +443,6 @@ int server_open_native_socket(Server*s) {
                 .un.sun_family = AF_UNIX,
                 .un.sun_path = "/run/systemd/journal/socket",
         };
-        static const int one = 1;
         int r;
 
         assert(s);
@@ -463,19 +462,19 @@ int server_open_native_socket(Server*s) {
         } else
                 (void) fd_nonblock(s->native_fd, true);
 
-        r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
+        r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return log_error_errno(errno, "SO_PASSCRED failed: %m");
 
 #if HAVE_SELINUX
         if (mac_selinux_use()) {
-                r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
+                r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSSEC, &const_int_one, sizeof(const_int_one));
                 if (r < 0)
                         log_warning_errno(errno, "SO_PASSSEC failed: %m");
         }
 #endif
 
-        r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
+        r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return log_error_errno(errno, "SO_TIMESTAMP failed: %m");
 
diff --git a/src/journal/journald-syslog.c b/src/journal/journald-syslog.c
index 5bf057f4ce..e347f8bf5d 100644
--- a/src/journal/journald-syslog.c
+++ b/src/journal/journald-syslog.c
@@ -447,7 +447,6 @@ int server_open_syslog_socket(Server *s) {
                 .un.sun_family = AF_UNIX,
                 .un.sun_path = "/run/systemd/journal/dev-log",
         };
-        static const int one = 1;
         int r;
 
         assert(s);
@@ -467,19 +466,19 @@ int server_open_syslog_socket(Server *s) {
         } else
                 (void) fd_nonblock(s->syslog_fd, true);
 
-        r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
+        r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return log_error_errno(errno, "SO_PASSCRED failed: %m");
 
 #if HAVE_SELINUX
         if (mac_selinux_use()) {
-                r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
+                r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &const_int_one, sizeof(const_int_one));
                 if (r < 0)
                         log_warning_errno(errno, "SO_PASSSEC failed: %m");
         }
 #endif
 
-        r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
+        r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return log_error_errno(errno, "SO_TIMESTAMP failed: %m");
 
diff --git a/src/libsystemd-network/dhcp-network.c b/src/libsystemd-network/dhcp-network.c
index cf59f14958..aa92376ee8 100644
--- a/src/libsystemd-network/dhcp-network.c
+++ b/src/libsystemd-network/dhcp-network.c
@@ -78,7 +78,7 @@ static int _bind_raw_socket(int ifindex, union sockaddr_union *link,
                 .filter = filter
         };
         _cleanup_close_ int s = -1;
-        int r, on = 1;
+        int r;
 
         assert(ifindex > 0);
         assert(link);
@@ -87,7 +87,7 @@ static int _bind_raw_socket(int ifindex, union sockaddr_union *link,
         if (s < 0)
                 return -errno;
 
-        r = setsockopt(s, SOL_PACKET, PACKET_AUXDATA, &on, sizeof(on));
+        r = setsockopt(s, SOL_PACKET, PACKET_AUXDATA, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return -errno;
 
@@ -149,7 +149,7 @@ int dhcp_network_bind_udp_socket(int ifindex, be32_t address, uint16_t port) {
         };
         _cleanup_close_ int s = -1;
         char ifname[IF_NAMESIZE] = "";
-        int r, on = 1, tos = IPTOS_CLASS_CS6;
+        int r, tos = IPTOS_CLASS_CS6;
 
         s = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
         if (s < 0)
@@ -159,7 +159,7 @@ int dhcp_network_bind_udp_socket(int ifindex, be32_t address, uint16_t port) {
         if (r < 0)
                 return -errno;
 
-        r = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+        r = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return -errno;
 
@@ -173,16 +173,16 @@ int dhcp_network_bind_udp_socket(int ifindex, be32_t address, uint16_t port) {
         }
 
         if (address == INADDR_ANY) {
-                r = setsockopt(s, IPPROTO_IP, IP_PKTINFO, &on, sizeof(on));
+                r = setsockopt(s, IPPROTO_IP, IP_PKTINFO, &const_int_one, sizeof(const_int_one));
                 if (r < 0)
                         return -errno;
 
-                r = setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on));
+                r = setsockopt(s, SOL_SOCKET, SO_BROADCAST, &const_int_one, sizeof(const_int_one));
                 if (r < 0)
                         return -errno;
 
         } else {
-                r = setsockopt(s, IPPROTO_IP, IP_FREEBIND, &on, sizeof(on));
+                r = setsockopt(s, IPPROTO_IP, IP_FREEBIND, &const_int_one, sizeof(const_int_one));
                 if (r < 0)
                         return -errno;
         }
diff --git a/src/libsystemd-network/dhcp6-network.c b/src/libsystemd-network/dhcp6-network.c
index 78cd383669..406b1efca4 100644
--- a/src/libsystemd-network/dhcp6-network.c
+++ b/src/libsystemd-network/dhcp6-network.c
@@ -25,7 +25,7 @@ int dhcp6_network_bind_udp_socket(int index, struct in6_addr *local_address) {
                 .in6.sin6_scope_id = index,
         };
         _cleanup_close_ int s = -1;
-        int r, off = 0, on = 1;
+        int r;
 
         assert(index > 0);
         assert(local_address);
@@ -36,15 +36,15 @@ int dhcp6_network_bind_udp_socket(int index, struct in6_addr *local_address) {
         if (s < 0)
                 return -errno;
 
-        r = setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on));
+        r = setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return -errno;
 
-        r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off, sizeof(off));
+        r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &const_int_zero, sizeof(const_int_zero));
         if (r < 0)
                 return -errno;
 
-        r = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+        r = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return -errno;
 
diff --git a/src/libsystemd-network/icmp6-util.c b/src/libsystemd-network/icmp6-util.c
index 8bee24e568..c27a92c6ca 100644
--- a/src/libsystemd-network/icmp6-util.c
+++ b/src/libsystemd-network/icmp6-util.c
@@ -33,7 +33,7 @@ static int icmp6_bind_router_message(const struct icmp6_filter *filter,
         int index = mreq->ipv6mr_interface;
         _cleanup_close_ int s = -1;
         char ifname[IF_NAMESIZE] = "";
-        static const int zero = 0, one = 1, hops = 255;
+        static const int hops = 255;
         int r;
 
         s = socket(AF_INET6, SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK, IPPROTO_ICMPV6);
@@ -56,7 +56,7 @@ static int icmp6_bind_router_message(const struct icmp6_filter *filter,
         if (r < 0)
                 return -errno;
 
-        r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &zero, sizeof(zero));
+        r = setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &const_int_zero, sizeof(const_int_zero));
         if (r < 0)
                 return -errno;
 
@@ -68,11 +68,11 @@ static int icmp6_bind_router_message(const struct icmp6_filter *filter,
         if (r < 0)
                 return -errno;
 
-        r = setsockopt(s, SOL_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one));
+        r = setsockopt(s, SOL_IPV6, IPV6_RECVHOPLIMIT, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return -errno;
 
-        r = setsockopt(s, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
+        r = setsockopt(s, SOL_SOCKET, SO_TIMESTAMP, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return -errno;
 
diff --git a/src/libsystemd/sd-netlink/netlink-socket.c b/src/libsystemd/sd-netlink/netlink-socket.c
index f103cbedea..c18fd5890e 100644
--- a/src/libsystemd/sd-netlink/netlink-socket.c
+++ b/src/libsystemd/sd-netlink/netlink-socket.c
@@ -88,9 +88,9 @@ static int broadcast_groups_get(sd_netlink *nl) {
 
 int socket_bind(sd_netlink *nl) {
         socklen_t addrlen;
-        int r, one = 1;
+        int r;
 
-        r = setsockopt(nl->fd, SOL_NETLINK, NETLINK_PKTINFO, &one, sizeof(one));
+        r = setsockopt(nl->fd, SOL_NETLINK, NETLINK_PKTINFO, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return -errno;
 
diff --git a/src/libudev/libudev-monitor.c b/src/libudev/libudev-monitor.c
index ea44308351..50c3925058 100644
--- a/src/libudev/libudev-monitor.c
+++ b/src/libudev/libudev-monitor.c
@@ -337,7 +337,6 @@ int udev_monitor_allow_unicast_sender(struct udev_monitor *udev_monitor, struct
  * Returns: 0 on success, otherwise a negative error value.
  */
 _public_ int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor) {
-        const int on = 1;
         int r;
 
         assert_return(udev_monitor, -EINVAL);
@@ -358,7 +357,7 @@ _public_ int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor) {
                 return log_debug_errno(r, "Failed to set address: %m");
 
         /* enable receiving of sender credentials */
-        if (setsockopt(udev_monitor->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0)
+        if (setsockopt(udev_monitor->sock, SOL_SOCKET, SO_PASSCRED, &const_int_one, sizeof(const_int_one)) < 0)
                 return log_debug_errno(errno, "Failed to set socket option SO_PASSCRED: %m");
 
         return 0;
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index d756d0aed0..49b8ba466a 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -2812,7 +2812,6 @@ static int inner_child(
 }
 
 static int setup_sd_notify_child(void) {
-        static const int one = 1;
         int fd = -1;
         union sockaddr_union sa = {
                 .un.sun_family = AF_UNIX,
@@ -2839,7 +2838,7 @@ static int setup_sd_notify_child(void) {
                 return log_error_errno(r, "Failed to chown " NSPAWN_NOTIFY_SOCKET_PATH ": %m");
         }
 
-        r = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
+        r = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 safe_close(fd);
                 return log_error_errno(errno, "SO_PASSCRED failed: %m");
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
index 5ceb954410..57af95c41f 100644
--- a/src/resolve/resolved-dns-scope.c
+++ b/src/resolve/resolved-dns-scope.c
@@ -313,7 +313,6 @@ static int dns_scope_socket(
         _cleanup_close_ int fd = -1;
         union sockaddr_union sa;
         socklen_t salen;
-        static const int one = 1;
         int r, ifindex;
 
         assert(s);
@@ -379,7 +378,7 @@ static int dns_scope_socket(
                 return -errno;
 
         if (type == SOCK_STREAM) {
-                r = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
+                r = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &const_int_one, sizeof(const_int_one));
                 if (r < 0)
                         return -errno;
         }
@@ -402,11 +401,11 @@ static int dns_scope_socket(
                 /* RFC 4795, section 2.5 requires the TTL to be set to 1 */
 
                 if (sa.sa.sa_family == AF_INET) {
-                        r = setsockopt(fd, IPPROTO_IP, IP_TTL, &one, sizeof(one));
+                        r = setsockopt(fd, IPPROTO_IP, IP_TTL, &const_int_one, sizeof(const_int_one));
                         if (r < 0)
                                 return -errno;
                 } else if (sa.sa.sa_family == AF_INET6) {
-                        r = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &one, sizeof(one));
+                        r = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &const_int_one, sizeof(const_int_one));
                         if (r < 0)
                                 return -errno;
                 }
diff --git a/src/resolve/resolved-dns-stub.c b/src/resolve/resolved-dns-stub.c
index 5ddf13081e..5f87a790c6 100644
--- a/src/resolve/resolved-dns-stub.c
+++ b/src/resolve/resolved-dns-stub.c
@@ -392,7 +392,6 @@ static int on_dns_stub_packet(sd_event_source *s, int fd, uint32_t revents, void
 }
 
 static int manager_dns_stub_udp_fd(Manager *m) {
-        static const int one = 1;
         union sockaddr_union sa = {
                 .in.sin_family = AF_INET,
                 .in.sin_port = htobe16(53),
@@ -408,13 +407,13 @@ static int manager_dns_stub_udp_fd(Manager *m) {
         if (fd < 0)
                 return -errno;
 
-        if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one) < 0)
+        if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof const_int_one) < 0)
                 return -errno;
 
-        if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof one) < 0)
+        if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &const_int_one, sizeof const_int_one) < 0)
                 return -errno;
 
-        if (setsockopt(fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof one) < 0)
+        if (setsockopt(fd, IPPROTO_IP, IP_RECVTTL, &const_int_one, sizeof const_int_one) < 0)
                 return -errno;
 
         /* Make sure no traffic from outside the local host can leak to onto this socket */
@@ -479,7 +478,6 @@ static int on_dns_stub_stream(sd_event_source *s, int fd, uint32_t revents, void
 }
 
 static int manager_dns_stub_tcp_fd(Manager *m) {
-        static const int one = 1;
         union sockaddr_union sa = {
                 .in.sin_family = AF_INET,
                 .in.sin_addr.s_addr = htobe32(INADDR_DNS_STUB),
@@ -495,16 +493,16 @@ static int manager_dns_stub_tcp_fd(Manager *m) {
         if (fd < 0)
                 return -errno;
 
-        if (setsockopt(fd, IPPROTO_IP, IP_TTL, &one, sizeof one) < 0)
+        if (setsockopt(fd, IPPROTO_IP, IP_TTL, &const_int_one, sizeof const_int_one) < 0)
                 return -errno;
 
-        if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one) < 0)
+        if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof const_int_one) < 0)
                 return -errno;
 
-        if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof one) < 0)
+        if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &const_int_one, sizeof const_int_one) < 0)
                 return -errno;
 
-        if (setsockopt(fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof one) < 0)
+        if (setsockopt(fd, IPPROTO_IP, IP_RECVTTL, &const_int_one, sizeof const_int_one) < 0)
                 return -errno;
 
         /* Make sure no traffic from outside the local host can leak to onto this socket */
diff --git a/src/resolve/resolved-llmnr.c b/src/resolve/resolved-llmnr.c
index 2f2a1a15ec..a6100c3b00 100644
--- a/src/resolve/resolved-llmnr.c
+++ b/src/resolve/resolved-llmnr.c
@@ -115,7 +115,7 @@ int manager_llmnr_ipv4_udp_fd(Manager *m) {
                 .in.sin_family = AF_INET,
                 .in.sin_port = htobe16(LLMNR_PORT),
         };
-        static const int one = 1, pmtu = IP_PMTUDISC_DONT, ttl = 255;
+        static const int pmtu = IP_PMTUDISC_DONT, ttl = 255;
         int r;
 
         assert(m);
@@ -140,19 +140,19 @@ int manager_llmnr_ipv4_udp_fd(Manager *m) {
                 goto fail;
         }
 
-        r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv4(UDP): Failed to set IP_MULTICAST_LOOP: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_PKTINFO, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv4(UDP): Failed to set IP_PKTINFO: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv4_udp_fd, IPPROTO_IP, IP_RECVTTL, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv4(UDP): Failed to set IP_RECVTTL: %m");
                 goto fail;
@@ -176,7 +176,7 @@ int manager_llmnr_ipv4_udp_fd(Manager *m) {
                 log_warning("LLMNR-IPv4(UDP): There appears to be another LLMNR responder running, or previously systemd-resolved crashed with some outstanding transfers.");
 
                 /* try again with SO_REUSEADDR */
-                r = setsockopt(m->llmnr_ipv4_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+                r = setsockopt(m->llmnr_ipv4_udp_fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
                 if (r < 0) {
                         r = log_error_errno(errno, "LLMNR-IPv4(UDP): Failed to set SO_REUSEADDR: %m");
                         goto fail;
@@ -189,7 +189,7 @@ int manager_llmnr_ipv4_udp_fd(Manager *m) {
                 }
         } else {
                 /* enable SO_REUSEADDR for the case that the user really wants multiple LLMNR responders */
-                r = setsockopt(m->llmnr_ipv4_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+                r = setsockopt(m->llmnr_ipv4_udp_fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
                 if (r < 0) {
                         r = log_error_errno(errno, "LLMNR-IPv4(UDP): Failed to set SO_REUSEADDR: %m");
                         goto fail;
@@ -214,7 +214,7 @@ int manager_llmnr_ipv6_udp_fd(Manager *m) {
                 .in6.sin6_family = AF_INET6,
                 .in6.sin6_port = htobe16(LLMNR_PORT),
         };
-        static const int one = 1, ttl = 255;
+        static const int ttl = 255;
         int r;
 
         assert(m);
@@ -239,25 +239,25 @@ int manager_llmnr_ipv6_udp_fd(Manager *m) {
                 goto fail;
         }
 
-        r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv6(UDP): Failed to set IPV6_MULTICAST_LOOP: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv6(UDP): Failed to set IPV6_V6ONLY: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv6(UDP): Failed to set IPV6_RECVPKTINFO: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv6_udp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv6(UDP): Failed to set IPV6_RECVHOPLIMIT: %m");
                 goto fail;
@@ -274,7 +274,7 @@ int manager_llmnr_ipv6_udp_fd(Manager *m) {
                 log_warning("LLMNR-IPv6(UDP): There appears to be another LLMNR responder running, or previously systemd-resolved crashed with some outstanding transfers.");
 
                 /* try again with SO_REUSEADDR */
-                r = setsockopt(m->llmnr_ipv6_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+                r = setsockopt(m->llmnr_ipv6_udp_fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
                 if (r < 0) {
                         r = log_error_errno(errno, "LLMNR-IPv6(UDP): Failed to set SO_REUSEADDR: %m");
                         goto fail;
@@ -287,7 +287,7 @@ int manager_llmnr_ipv6_udp_fd(Manager *m) {
                 }
         } else {
                 /* enable SO_REUSEADDR for the case that the user really wants multiple LLMNR responders */
-                r = setsockopt(m->llmnr_ipv6_udp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+                r = setsockopt(m->llmnr_ipv6_udp_fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
                 if (r < 0) {
                         r = log_error_errno(errno, "LLMNR-IPv6(UDP): Failed to set SO_REUSEADDR: %m");
                         goto fail;
@@ -355,7 +355,7 @@ int manager_llmnr_ipv4_tcp_fd(Manager *m) {
                 .in.sin_family = AF_INET,
                 .in.sin_port = htobe16(LLMNR_PORT),
         };
-        static const int one = 1, pmtu = IP_PMTUDISC_DONT;
+        static const int pmtu = IP_PMTUDISC_DONT;
         int r;
 
         assert(m);
@@ -368,19 +368,19 @@ int manager_llmnr_ipv4_tcp_fd(Manager *m) {
                 return log_error_errno(errno, "LLMNR-IPv4(TCP): Failed to create socket: %m");
 
         /* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */
-        r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_TTL, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_TTL, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv4(TCP): Failed to set IP_TTL: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_PKTINFO, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv4(TCP): Failed to set IP_PKTINFO: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv4_tcp_fd, IPPROTO_IP, IP_RECVTTL, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv4(TCP): Failed to set IP_RECVTTL: %m");
                 goto fail;
@@ -404,7 +404,7 @@ int manager_llmnr_ipv4_tcp_fd(Manager *m) {
                 log_warning("LLMNR-IPv4(TCP): There appears to be another LLMNR responder running, or previously systemd-resolved crashed with some outstanding transfers.");
 
                 /* try again with SO_REUSEADDR */
-                r = setsockopt(m->llmnr_ipv4_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+                r = setsockopt(m->llmnr_ipv4_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
                 if (r < 0) {
                         r = log_error_errno(errno, "LLMNR-IPv4(TCP): Failed to set SO_REUSEADDR: %m");
                         goto fail;
@@ -417,7 +417,7 @@ int manager_llmnr_ipv4_tcp_fd(Manager *m) {
                 }
         } else {
                 /* enable SO_REUSEADDR for the case that the user really wants multiple LLMNR responders */
-                r = setsockopt(m->llmnr_ipv4_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+                r = setsockopt(m->llmnr_ipv4_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
                 if (r < 0) {
                         r = log_error_errno(errno, "LLMNR-IPv4(TCP): Failed to set SO_REUSEADDR: %m");
                         goto fail;
@@ -448,7 +448,6 @@ int manager_llmnr_ipv6_tcp_fd(Manager *m) {
                 .in6.sin6_family = AF_INET6,
                 .in6.sin6_port = htobe16(LLMNR_PORT),
         };
-        static const int one = 1;
         int r;
 
         assert(m);
@@ -461,25 +460,25 @@ int manager_llmnr_ipv6_tcp_fd(Manager *m) {
                 return log_error_errno(errno, "LLMNR-IPv6(TCP): Failed to create socket: %m");
 
         /* RFC 4795, section 2.5. requires setting the TTL of TCP streams to 1 */
-        r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv6(TCP): Failed to set IPV6_UNICAST_HOPS: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_V6ONLY, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv6(TCP): Failed to set IPV6_V6ONLY: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv6(TCP): Failed to set IPV6_RECVPKTINFO: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one));
+        r = setsockopt(m->llmnr_ipv6_tcp_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "LLMNR-IPv6(TCP): Failed to set IPV6_RECVHOPLIMIT: %m");
                 goto fail;
@@ -496,7 +495,7 @@ int manager_llmnr_ipv6_tcp_fd(Manager *m) {
                 log_warning("LLMNR-IPv6(TCP): There appears to be another LLMNR responder running, or previously systemd-resolved crashed with some outstanding transfers.");
 
                 /* try again with SO_REUSEADDR */
-                r = setsockopt(m->llmnr_ipv6_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+                r = setsockopt(m->llmnr_ipv6_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
                 if (r < 0) {
                         r = log_error_errno(errno, "LLMNR-IPv6(TCP): Failed to set SO_REUSEADDR: %m");
                         goto fail;
@@ -509,7 +508,7 @@ int manager_llmnr_ipv6_tcp_fd(Manager *m) {
                 }
         } else {
                 /* enable SO_REUSEADDR for the case that the user really wants multiple LLMNR responders */
-                r = setsockopt(m->llmnr_ipv6_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+                r = setsockopt(m->llmnr_ipv6_tcp_fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
                 if (r < 0) {
                         r = log_error_errno(errno, "LLMNR-IPv6(TCP): Failed to set SO_REUSEADDR: %m");
                         goto fail;
diff --git a/src/resolve/resolved-mdns.c b/src/resolve/resolved-mdns.c
index e70138181a..be258b0e85 100644
--- a/src/resolve/resolved-mdns.c
+++ b/src/resolve/resolved-mdns.c
@@ -344,7 +344,7 @@ int manager_mdns_ipv4_fd(Manager *m) {
                 .in.sin_family = AF_INET,
                 .in.sin_port = htobe16(MDNS_PORT),
         };
-        static const int one = 1, pmtu = IP_PMTUDISC_DONT, ttl = 255;
+        static const int pmtu = IP_PMTUDISC_DONT, ttl = 255;
         int r;
 
         assert(m);
@@ -368,19 +368,19 @@ int manager_mdns_ipv4_fd(Manager *m) {
                 goto fail;
         }
 
-        r = setsockopt(m->mdns_ipv4_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &one, sizeof(one));
+        r = setsockopt(m->mdns_ipv4_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "mDNS-IPv4: Failed to set IP_MULTICAST_LOOP: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->mdns_ipv4_fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one));
+        r = setsockopt(m->mdns_ipv4_fd, IPPROTO_IP, IP_PKTINFO, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "mDNS-IPv4: Failed to set IP_PKTINFO: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->mdns_ipv4_fd, IPPROTO_IP, IP_RECVTTL, &one, sizeof(one));
+        r = setsockopt(m->mdns_ipv4_fd, IPPROTO_IP, IP_RECVTTL, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "mDNS-IPv4: Failed to set IP_RECVTTL: %m");
                 goto fail;
@@ -405,7 +405,7 @@ int manager_mdns_ipv4_fd(Manager *m) {
                 log_warning("mDNS-IPv4: There appears to be another mDNS responder running, or previously systemd-resolved crashed with some outstanding transfers.");
 
                 /* try again with SO_REUSEADDR */
-                r = setsockopt(m->mdns_ipv4_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+                r = setsockopt(m->mdns_ipv4_fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
                 if (r < 0) {
                         r = log_error_errno(errno, "mDNS-IPv4: Failed to set SO_REUSEADDR: %m");
                         goto fail;
@@ -418,7 +418,7 @@ int manager_mdns_ipv4_fd(Manager *m) {
                 }
         } else {
                 /* enable SO_REUSEADDR for the case that the user really wants multiple mDNS responders */
-                r = setsockopt(m->mdns_ipv4_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+                r = setsockopt(m->mdns_ipv4_fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
                 if (r < 0) {
                         r = log_error_errno(errno, "mDNS-IPv4: Failed to set SO_REUSEADDR: %m");
                         goto fail;
@@ -441,7 +441,7 @@ int manager_mdns_ipv6_fd(Manager *m) {
                 .in6.sin6_family = AF_INET6,
                 .in6.sin6_port = htobe16(MDNS_PORT),
         };
-        static const int one = 1, ttl = 255;
+        static const int ttl = 255;
         int r;
 
         assert(m);
@@ -466,25 +466,25 @@ int manager_mdns_ipv6_fd(Manager *m) {
                 goto fail;
         }
 
-        r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &one, sizeof(one));
+        r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "mDNS-IPv6: Failed to set IPV6_MULTICAST_LOOP: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
+        r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_V6ONLY, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "mDNS-IPv6: Failed to set IPV6_V6ONLY: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
+        r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "mDNS-IPv6: Failed to set IPV6_RECVPKTINFO: %m");
                 goto fail;
         }
 
-        r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &one, sizeof(one));
+        r = setsockopt(m->mdns_ipv6_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &const_int_one, sizeof(const_int_one));
         if (r < 0) {
                 r = log_error_errno(errno, "mDNS-IPv6: Failed to set IPV6_RECVHOPLIMIT: %m");
                 goto fail;
@@ -502,7 +502,7 @@ int manager_mdns_ipv6_fd(Manager *m) {
                 log_warning("mDNS-IPv6: There appears to be another mDNS responder running, or previously systemd-resolved crashed with some outstanding transfers.");
 
                 /* try again with SO_REUSEADDR */
-                r = setsockopt(m->mdns_ipv6_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+                r = setsockopt(m->mdns_ipv6_fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
                 if (r < 0) {
                         r = log_error_errno(errno, "mDNS-IPv6: Failed to set SO_REUSEADDR: %m");
                         goto fail;
@@ -515,7 +515,7 @@ int manager_mdns_ipv6_fd(Manager *m) {
                 }
         } else {
                 /* enable SO_REUSEADDR for the case that the user really wants multiple mDNS responders */
-                r = setsockopt(m->mdns_ipv6_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+                r = setsockopt(m->mdns_ipv6_fd, SOL_SOCKET, SO_REUSEADDR, &const_int_one, sizeof(const_int_one));
                 if (r < 0) {
                         r = log_error_errno(errno, "mDNS-IPv6: Failed to set SO_REUSEADDR: %m");
                         goto fail;
diff --git a/src/shared/ask-password-api.c b/src/shared/ask-password-api.c
index 2581fca013..681fd0d618 100644
--- a/src/shared/ask-password-api.c
+++ b/src/shared/ask-password-api.c
@@ -455,7 +455,6 @@ static int create_socket(char **ret) {
         _cleanup_free_ char *path = NULL;
         union sockaddr_union sa = {};
         _cleanup_close_ int fd = -1;
-        static const int one = 1;
         int salen;
 
         assert(ret);
@@ -476,7 +475,7 @@ static int create_socket(char **ret) {
                         return -errno;
         }
 
-        if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
+        if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &const_int_one, sizeof(const_int_one)) < 0)
                 return -errno;
 
         *ret = TAKE_PTR(path);
diff --git a/src/timesync/timesyncd-manager.c b/src/timesync/timesyncd-manager.c
index 5a3d478d73..f33a32afc0 100644
--- a/src/timesync/timesyncd-manager.c
+++ b/src/timesync/timesyncd-manager.c
@@ -630,7 +630,6 @@ static int manager_receive_response(sd_event_source *source, int fd, uint32_t re
 static int manager_listen_setup(Manager *m) {
         union sockaddr_union addr = {};
         static const int tos = IPTOS_LOWDELAY;
-        static const int on = 1;
         int r;
 
         assert(m);
@@ -651,7 +650,7 @@ static int manager_listen_setup(Manager *m) {
         if (r < 0)
                 return -errno;
 
-        r = setsockopt(m->server_socket, SOL_SOCKET, SO_TIMESTAMPNS, &on, sizeof(on));
+        r = setsockopt(m->server_socket, SOL_SOCKET, SO_TIMESTAMPNS, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return -errno;
 
diff --git a/src/udev/udev-ctrl.c b/src/udev/udev-ctrl.c
index 84909b3e15..312c0b2ae8 100644
--- a/src/udev/udev-ctrl.c
+++ b/src/udev/udev-ctrl.c
@@ -73,7 +73,6 @@ struct udev_ctrl_connection {
 
 struct udev_ctrl *udev_ctrl_new_from_fd(int fd) {
         struct udev_ctrl *uctrl;
-        const int on = 1;
         int r;
 
         uctrl = new0(struct udev_ctrl, 1);
@@ -97,7 +96,7 @@ struct udev_ctrl *udev_ctrl_new_from_fd(int fd) {
          * FIXME: remove it as soon as we can depend on this:
          *   http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=90c6bd34f884cd9cee21f1d152baf6c18bcac949
          */
-        r = setsockopt(uctrl->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
+        r = setsockopt(uctrl->sock, SOL_SOCKET, SO_PASSCRED, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 log_warning_errno(errno, "could not set SO_PASSCRED: %m");
 
@@ -164,7 +163,6 @@ int udev_ctrl_get_fd(struct udev_ctrl *uctrl) {
 struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl) {
         struct udev_ctrl_connection *conn;
         struct ucred ucred = {};
-        const int on = 1;
         int r;
 
         conn = new(struct udev_ctrl_connection, 1);
@@ -192,7 +190,7 @@ struct udev_ctrl_connection *udev_ctrl_get_connection(struct udev_ctrl *uctrl) {
         }
 
         /* enable receiving of the sender credentials in the messages */
-        r = setsockopt(conn->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
+        r = setsockopt(conn->sock, SOL_SOCKET, SO_PASSCRED, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 log_warning_errno(errno, "could not set SO_PASSCRED: %m");
 
diff --git a/src/udev/udev-rules.c b/src/udev/udev-rules.c
index 4d87754042..d3156859fa 100644
--- a/src/udev/udev-rules.c
+++ b/src/udev/udev-rules.c
@@ -1392,17 +1392,12 @@ static void add_rule(struct udev_rules *rules, char *line,
                                 rule_add_key(&rule_tmp, TK_A_DB_PERSIST, op, NULL, NULL);
 
                         pos = strstr(value, "nowatch");
-                        if (pos != NULL) {
-                                const int off = 0;
-
-                                rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &off);
-                        } else {
+                        if (pos)
+                                rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &const_int_zero);
+                        else {
                                 pos = strstr(value, "watch");
-                                if (pos != NULL) {
-                                        const int on = 1;
-
-                                        rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &on);
-                                }
+                                if (pos)
+                                        rule_add_key(&rule_tmp, TK_A_INOTIFY_WATCH, op, NULL, &const_int_one);
                         }
 
                         pos = strstr(value, "static_node=");
diff --git a/src/udev/udevd.c b/src/udev/udevd.c
index ea1476e7dd..7830ba19c1 100644
--- a/src/udev/udevd.c
+++ b/src/udev/udevd.c
@@ -1508,7 +1508,7 @@ static int parse_argv(int argc, char *argv[]) {
 
 static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent, const char *cgroup) {
         _cleanup_(manager_freep) Manager *manager = NULL;
-        int r, fd_worker, one = 1;
+        int r, fd_worker;
 
         assert(ret);
         assert(fd_ctrl >= 0);
@@ -1548,7 +1548,7 @@ static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent, const char *cg
 
         fd_worker = manager->worker_watch[READ_END];
 
-        r = setsockopt(fd_worker, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
+        r = setsockopt(fd_worker, SOL_SOCKET, SO_PASSCRED, &const_int_one, sizeof(const_int_one));
         if (r < 0)
                 return log_error_errno(errno, "could not enable SO_PASSCRED: %m");