From b72d521340383b6418fa6a75faca3bc45f06b14a Mon Sep 17 00:00:00 2001
From: Sebastian Harl <sh@tokkee.org>
Date: Wed, 11 Feb 2009 10:43:25 +0100
Subject: [PATCH] Document unused parameters.

In all cases where unused parameters have to exist either because some API
requires it or for more consistency, they now have been documented using
__attribute__((unused)) (which is automatically disabled in case GCC is not
used to prevent problems with compilers not supporting attributes). In a few
other cases, the parameters have been removed.

This allows the use of -Wunused-parameter (which is enabled by -Wextra as
well, when using -Wall).
---
 src/apache.c              |  2 +-
 src/ascent.c              |  2 +-
 src/battery.c             |  4 ++--
 src/bind.c                |  2 +-
 src/collectd.c            |  8 ++++----
 src/collectdmon.c         |  8 ++++++--
 src/dns.c                 |  2 +-
 src/email.c               |  2 +-
 src/exec.c                |  2 +-
 src/filter_chain.c        | 18 ++++++++++++------
 src/ipmi.c                | 14 +++++++-------
 src/match_regex.c         |  6 ++++--
 src/match_value.c         |  2 +-
 src/netlink.c             |  6 +++---
 src/network.c             |  7 ++++---
 src/nginx.c               |  3 ++-
 src/notify_email.c        |  7 ++++---
 src/plugin.c              |  2 +-
 src/rrdtool.c             |  4 ++--
 src/snmp.c                |  2 +-
 src/target_notification.c |  2 +-
 src/target_replace.c      |  2 +-
 src/target_set.c          |  2 +-
 src/teamspeak2.c          |  4 ++--
 src/thermal.c             |  8 ++++----
 src/unixsock.c            |  2 +-
 src/utils_dns.c           | 14 +++++---------
 src/utils_match.c         |  2 +-
 src/utils_tail_match.c    |  3 ++-
 src/utils_threshold.c     |  2 +-
 30 files changed, 78 insertions(+), 66 deletions(-)

diff --git a/src/apache.c b/src/apache.c
index 7dc34f5b..091d5947 100644
--- a/src/apache.c
+++ b/src/apache.c
@@ -55,7 +55,7 @@ static const char *config_keys[] =
 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
 
 static size_t apache_curl_callback (void *buf, size_t size, size_t nmemb,
-		void *stream)
+		void __attribute__((unused)) *stream)
 {
 	size_t len = size * nmemb;
 
diff --git a/src/ascent.c b/src/ascent.c
index bf1e9f4a..54341c77 100644
--- a/src/ascent.c
+++ b/src/ascent.c
@@ -143,7 +143,7 @@ static int ascent_submit_gauge (const char *plugin_instance, /* {{{ */
 } /* }}} int ascent_submit_gauge */
 
 static size_t ascent_curl_callback (void *buf, size_t size, size_t nmemb, /* {{{ */
-    void *stream)
+    void __attribute__((unused)) *stream)
 {
   size_t len = size * nmemb;
 
diff --git a/src/battery.c b/src/battery.c
index d142982d..272193ee 100644
--- a/src/battery.c
+++ b/src/battery.c
@@ -314,8 +314,8 @@ static void get_via_generic_iokit (double *ret_charge,
 #endif /* HAVE_IOKIT_IOKITLIB_H */
 
 #if KERNEL_LINUX
-static int battery_read_acpi (const char *dir, const char *name,
-		void *user_data)
+static int battery_read_acpi (const char __attribute__((unused)) *dir,
+		const char *name, void __attribute__((unused)) *user_data)
 {
 	double  current = INVALID_VALUE;
 	double  voltage = INVALID_VALUE;
diff --git a/src/bind.c b/src/bind.c
index f9de8e6a..8cd11165 100644
--- a/src/bind.c
+++ b/src/bind.c
@@ -281,7 +281,7 @@ static void submit_counter(time_t ts, const char *plugin_instance, const char *t
 } /* void submit_counter */
 
 static size_t bind_curl_callback (void *buf, size_t size, size_t nmemb,
-    void *stream)
+    void __attribute__((unused)) *stream)
 {
   size_t len = size * nmemb;
 
diff --git a/src/collectd.c b/src/collectd.c
index 17905c74..576abef4 100644
--- a/src/collectd.c
+++ b/src/collectd.c
@@ -47,7 +47,7 @@ kstat_ctl_t *kc;
 
 static int loop = 0;
 
-static void *do_flush (void *arg)
+static void *do_flush (void __attribute__((unused)) *arg)
 {
 	INFO ("Flushing all data.");
 	plugin_flush (NULL, -1, NULL);
@@ -56,17 +56,17 @@ static void *do_flush (void *arg)
 	return NULL;
 }
 
-static void sig_int_handler (int signal)
+static void sig_int_handler (int __attribute__((unused)) signal)
 {
 	loop++;
 }
 
-static void sig_term_handler (int signal)
+static void sig_term_handler (int __attribute__((unused)) signal)
 {
 	loop++;
 }
 
-static void sig_usr1_handler (int signal)
+static void sig_usr1_handler (int __attribute__((unused)) signal)
 {
 	pthread_t      thread;
 	pthread_attr_t attr;
diff --git a/src/collectdmon.c b/src/collectdmon.c
index 015344f9..078b2eb1 100644
--- a/src/collectdmon.c
+++ b/src/collectdmon.c
@@ -19,6 +19,10 @@
  *   Sebastian Harl <sh at tokkee.org>
  **/
 
+#if !defined(__GNUC__) || !__GNUC__
+# define __attribute__(x) /**/
+#endif
+
 #include "config.h"
 
 #include <assert.h>
@@ -197,13 +201,13 @@ static int collectd_stop (void)
 	return 0;
 } /* collectd_stop */
 
-static void sig_int_term_handler (int signo)
+static void sig_int_term_handler (int __attribute__((unused)) signo)
 {
 	++loop;
 	return;
 } /* sig_int_term_handler */
 
-static void sig_hup_handler (int signo)
+static void sig_hup_handler (int __attribute__((unused)) signo)
 {
 	++restart;
 	return;
diff --git a/src/dns.c b/src/dns.c
index d82cbd86..ab38789f 100644
--- a/src/dns.c
+++ b/src/dns.c
@@ -195,7 +195,7 @@ static void dns_child_callback (const rfc1035_header_t *dns)
 	pthread_mutex_unlock (&opcode_mutex);
 }
 
-static void *dns_child_loop (void *dummy)
+static void *dns_child_loop (void __attribute__((unused)) *dummy)
 {
 	pcap_t *pcap_obj;
 	char    pcap_error[PCAP_ERRBUF_SIZE];
diff --git a/src/email.c b/src/email.c
index ff9d4394..f79217cb 100644
--- a/src/email.c
+++ b/src/email.c
@@ -378,7 +378,7 @@ static void *collect (void *arg)
 	pthread_exit ((void *)0);
 } /* static void *collect (void *) */
 
-static void *open_connection (void *arg)
+static void *open_connection (void __attribute__((unused)) *arg)
 {
 	struct sockaddr_un addr;
 
diff --git a/src/exec.c b/src/exec.c
index a78f902f..8add480e 100644
--- a/src/exec.c
+++ b/src/exec.c
@@ -78,7 +78,7 @@ static pthread_mutex_t pl_lock = PTHREAD_MUTEX_INITIALIZER;
 /*
  * Functions
  */
-static void sigchld_handler (int signal) /* {{{ */
+static void sigchld_handler (int __attribute__((unused)) signal) /* {{{ */
 {
   pid_t pid;
   int status;
diff --git a/src/filter_chain.c b/src/filter_chain.c
index 6d0bca7b..4c324a80 100644
--- a/src/filter_chain.c
+++ b/src/filter_chain.c
@@ -609,7 +609,8 @@ static int fc_bit_jump_destroy (void **user_data) /* {{{ */
 } /* }}} int fc_bit_jump_destroy */
 
 static int fc_bit_jump_invoke (const data_set_t *ds, /* {{{ */
-    value_list_t *vl, notification_meta_t **meta, void **user_data)
+    value_list_t *vl, notification_meta_t __attribute__((unused)) **meta,
+    void **user_data)
 {
   char *chain_name;
   fc_chain_t *chain;
@@ -637,14 +638,18 @@ static int fc_bit_jump_invoke (const data_set_t *ds, /* {{{ */
     return (FC_TARGET_CONTINUE);
 } /* }}} int fc_bit_jump_invoke */
 
-static int fc_bit_stop_invoke (const data_set_t *ds, /* {{{ */
-    value_list_t *vl, notification_meta_t **meta, void **user_data)
+static int fc_bit_stop_invoke (const data_set_t __attribute__((unused)) *ds, /* {{{ */
+    value_list_t __attribute__((unused)) *vl,
+    notification_meta_t __attribute__((unused)) **meta,
+    void __attribute__((unused)) **user_data)
 {
   return (FC_TARGET_STOP);
 } /* }}} int fc_bit_stop_invoke */
 
-static int fc_bit_return_invoke (const data_set_t *ds, /* {{{ */
-    value_list_t *vl, notification_meta_t **meta, void **user_data)
+static int fc_bit_return_invoke (const data_set_t __attribute__((unused)) *ds, /* {{{ */
+    value_list_t __attribute__((unused)) *vl,
+    notification_meta_t __attribute__((unused)) **meta,
+    void __attribute__((unused)) **user_data)
 {
   return (FC_TARGET_RETURN);
 } /* }}} int fc_bit_return_invoke */
@@ -726,7 +731,8 @@ static int fc_bit_write_destroy (void **user_data) /* {{{ */
 } /* }}} int fc_bit_write_destroy */
 
 static int fc_bit_write_invoke (const data_set_t *ds, /* {{{ */
-    value_list_t *vl, notification_meta_t **meta, void **user_data)
+    value_list_t *vl, notification_meta_t __attribute__((unused)) **meta,
+    void **user_data)
 {
   char **plugin_list;
   int status;
diff --git a/src/ipmi.c b/src/ipmi.c
index 10590705..0b79823d 100644
--- a/src/ipmi.c
+++ b/src/ipmi.c
@@ -111,9 +111,9 @@ static int sensor_list_remove (ipmi_sensor_t *sensor);
 static void sensor_read_handler (ipmi_sensor_t *sensor,
     int err,
     enum ipmi_value_present_e value_present,
-    unsigned int raw_value,
+    unsigned int __attribute__((unused)) raw_value,
     double value,
-    ipmi_states_t *states,
+    ipmi_states_t __attribute__((unused)) *states,
     void *user_data)
 {
   value_t values[1];
@@ -459,9 +459,9 @@ static int sensor_list_remove_all (void)
  * Entity handlers
  */
 static void entity_sensor_update_handler (enum ipmi_update_e op,
-    ipmi_entity_t *entity,
+    ipmi_entity_t __attribute__((unused)) *entity,
     ipmi_sensor_t *sensor,
-    void *user_data)
+    void __attribute__((unused)) *user_data)
 {
   /* TODO: Ignore sensors we cannot read */
 
@@ -480,9 +480,9 @@ static void entity_sensor_update_handler (enum ipmi_update_e op,
  * Domain handlers
  */
 static void domain_entity_update_handler (enum ipmi_update_e op,
-    ipmi_domain_t *domain,
+    ipmi_domain_t __attribute__((unused)) *domain,
     ipmi_entity_t *entity,
-    void *user_data)
+    void __attribute__((unused)) *user_data)
 {
   int status;
 
@@ -574,7 +574,7 @@ static int thread_init (os_handler_t **ret_os_handler)
   return (0);
 } /* int thread_init */
 
-static void *thread_main (void *user_data)
+static void *thread_main (void __attribute__((unused)) *user_data)
 {
   int status;
   os_handler_t *os_handler = NULL;
diff --git a/src/match_regex.c b/src/match_regex.c
index 9233d803..1fca8898 100644
--- a/src/match_regex.c
+++ b/src/match_regex.c
@@ -257,8 +257,10 @@ static int mr_destroy (void **user_data) /* {{{ */
 	return (0);
 } /* }}} int mr_destroy */
 
-static int mr_match (const data_set_t *ds, const value_list_t *vl, /* {{{ */
-		notification_meta_t **meta, void **user_data)
+static int mr_match (const data_set_t __attribute__((unused)) *ds, /* {{{ */
+		const value_list_t *vl,
+		notification_meta_t __attribute__((unused)) **meta,
+		void **user_data)
 {
 	mr_match_t *m;
 
diff --git a/src/match_value.c b/src/match_value.c
index a3eeffd4..9f02226b 100644
--- a/src/match_value.c
+++ b/src/match_value.c
@@ -258,7 +258,7 @@ static int mv_destroy (void **user_data) /* {{{ */
 } /* }}} int mv_destroy */
 
 static int mv_match (const data_set_t *ds, const value_list_t *vl, /* {{{ */
-    notification_meta_t **meta, void **user_data)
+    notification_meta_t __attribute__((unused)) **meta, void **user_data)
 {
   mv_match_t *m;
   gauge_t *values;
diff --git a/src/netlink.c b/src/netlink.c
index d7d1a269..8f45ea2e 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -204,8 +204,8 @@ static void submit_two (const char *dev, const char *type,
   plugin_dispatch_values (&vl);
 } /* void submit_two */
 
-static int link_filter (const struct sockaddr_nl *sa,
-    struct nlmsghdr *nmh, void *args)
+static int link_filter (const struct sockaddr_nl __attribute__((unused)) *sa,
+    struct nlmsghdr *nmh, void __attribute__((unused)) *args)
 {
   struct ifinfomsg *msg;
   int msg_len;
@@ -314,7 +314,7 @@ static int link_filter (const struct sockaddr_nl *sa,
   return (0);
 } /* int link_filter */
 
-static int qos_filter (const struct sockaddr_nl *sa,
+static int qos_filter (const struct sockaddr_nl __attribute__((unused)) *sa,
     struct nlmsghdr *nmh, void *args)
 {
   struct tcmsg *msg;
diff --git a/src/network.c b/src/network.c
index 34f89d96..e0800004 100644
--- a/src/network.c
+++ b/src/network.c
@@ -1240,7 +1240,7 @@ static int network_add_sending_socket (const char *node, const char *service)
 	return (0);
 } /* int network_get_listen_socket */
 
-static void *dispatch_thread (void *arg)
+static void *dispatch_thread (void __attribute__((unused)) *arg)
 {
   while (42)
   {
@@ -1391,7 +1391,7 @@ static int network_receive (void)
 	return (0);
 }
 
-static void *receive_thread (void *arg)
+static void *receive_thread (void __attribute__((unused)) *arg)
 {
 	return (network_receive () ? (void *) 1 : (void *) 0);
 } /* void *receive_thread */
@@ -1808,7 +1808,8 @@ static int network_init (void)
  * just send the buffer if `flush'  is called - if the requested value was in
  * there, good. If not, well, then there is nothing to flush.. -octo
  */
-static int network_flush (int timeout, const char *identifier)
+static int network_flush (int timeout,
+		const char __attribute__((unused)) *identifier)
 {
 	pthread_mutex_lock (&send_buffer_lock);
 
diff --git a/src/nginx.c b/src/nginx.c
index 8cb76285..dfa4f983 100644
--- a/src/nginx.c
+++ b/src/nginx.c
@@ -52,7 +52,8 @@ static const char *config_keys[] =
 };
 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
 
-static size_t nginx_curl_callback (void *buf, size_t size, size_t nmemb, void *stream)
+static size_t nginx_curl_callback (void *buf, size_t size, size_t nmemb,
+    void __attribute__((unused)) *stream)
 {
   size_t len = size * nmemb;
 
diff --git a/src/notify_email.c b/src/notify_email.c
index dc4e47f7..32bd9164 100644
--- a/src/notify_email.c
+++ b/src/notify_email.c
@@ -61,7 +61,7 @@ static char *email_subject = NULL;
 
 /* Callback to get username and password */
 static int authinteract (auth_client_request_t request, char **result,
-    int fields, void *arg)
+    int fields, void __attribute__((unused)) *arg)
 {               
   int i;
   for (i = 0; i < fields; i++)
@@ -78,7 +78,7 @@ static int authinteract (auth_client_request_t request, char **result,
 
 /* Callback to print the recipient status */
 static void print_recipient_status (smtp_recipient_t recipient,
-    const char *mailbox, void *arg)
+    const char *mailbox, void __attribute__((unused)) *arg)
 {
   const smtp_status_t *status;
 
@@ -90,7 +90,8 @@ static void print_recipient_status (smtp_recipient_t recipient,
 } /* void print_recipient_status */
 
 /* Callback to monitor SMTP activity */
-static void monitor_cb (const char *buf, int buflen, int writing, void *arg)
+static void monitor_cb (const char *buf, int buflen, int writing,
+    void __attribute__((unused)) *arg)
 {
   char log_str[MAXSTRING];
 
diff --git a/src/plugin.c b/src/plugin.c
index 4aabebe3..9d558cb1 100644
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -171,7 +171,7 @@ static int plugin_load_file (char *file)
 	return (0);
 }
 
-static void *plugin_read_thread (void *args)
+static void *plugin_read_thread (void __attribute__((unused)) *args)
 {
 	llentry_t   *le;
 	read_func_t *rf;
diff --git a/src/rrdtool.c b/src/rrdtool.c
index 95bde694..debb7bd4 100644
--- a/src/rrdtool.c
+++ b/src/rrdtool.c
@@ -223,7 +223,7 @@ static int value_list_to_string (char *buffer, int buffer_len,
 } /* int value_list_to_string */
 
 static int value_list_to_filename (char *buffer, int buffer_len,
-		const data_set_t *ds, const value_list_t *vl)
+		const data_set_t __attribute__((unused)) *ds, const value_list_t *vl)
 {
 	int offset = 0;
 	int status;
@@ -266,7 +266,7 @@ static int value_list_to_filename (char *buffer, int buffer_len,
 	return (0);
 } /* int value_list_to_filename */
 
-static void *rrd_queue_thread (void *data)
+static void *rrd_queue_thread (void __attribute__((unused)) *data)
 {
         struct timeval tv_next_update;
         struct timeval tv_now;
diff --git a/src/snmp.c b/src/snmp.c
index 44fce620..82fd6583 100644
--- a/src/snmp.c
+++ b/src/snmp.c
@@ -1451,7 +1451,7 @@ static int csnmp_read_host (host_definition_t *host)
   return (0);
 } /* int csnmp_read_host */
 
-static void *csnmp_read_thread (void *data)
+static void *csnmp_read_thread (void __attribute__((unused)) *data)
 {
   host_definition_t *host;
 
diff --git a/src/target_notification.c b/src/target_notification.c
index f77d3387..9ee1518a 100644
--- a/src/target_notification.c
+++ b/src/target_notification.c
@@ -223,7 +223,7 @@ static int tn_create (const oconfig_item_t *ci, void **user_data) /* {{{ */
 } /* }}} int tn_create */
 
 static int tn_invoke (const data_set_t *ds, value_list_t *vl, /* {{{ */
-    notification_meta_t **meta, void **user_data)
+    notification_meta_t __attribute__((unused)) **meta, void **user_data)
 {
   tn_data_t *data;
   notification_t n;
diff --git a/src/target_replace.c b/src/target_replace.c
index 6e72f31b..3f983c86 100644
--- a/src/target_replace.c
+++ b/src/target_replace.c
@@ -353,7 +353,7 @@ static int tr_create (const oconfig_item_t *ci, void **user_data) /* {{{ */
 } /* }}} int tr_create */
 
 static int tr_invoke (const data_set_t *ds, value_list_t *vl, /* {{{ */
-    notification_meta_t **meta, void **user_data)
+    notification_meta_t __attribute__((unused)) **meta, void **user_data)
 {
   tr_data_t *data;
 
diff --git a/src/target_set.c b/src/target_set.c
index 70b0fdfc..19ff7b92 100644
--- a/src/target_set.c
+++ b/src/target_set.c
@@ -228,7 +228,7 @@ static int ts_create (const oconfig_item_t *ci, void **user_data) /* {{{ */
 } /* }}} int ts_create */
 
 static int ts_invoke (const data_set_t *ds, value_list_t *vl, /* {{{ */
-    notification_meta_t **meta, void **user_data)
+    notification_meta_t __attribute__((unused)) **meta, void **user_data)
 {
   ts_data_t *data;
 
diff --git a/src/teamspeak2.c b/src/teamspeak2.c
index e81dbe30..d4bf2aa4 100644
--- a/src/teamspeak2.c
+++ b/src/teamspeak2.c
@@ -406,7 +406,7 @@ static int tss2_select_vserver (FILE *read_fh, FILE *write_fh, vserver_list_t *v
 } /* int tss2_select_vserver */
 
 static int tss2_vserver_gapl (FILE *read_fh, FILE *write_fh,
-		vserver_list_t *vserver, gauge_t *ret_value)
+		gauge_t *ret_value)
 {
 	/*
 	 * Reads the vserver's average packet loss and submits it to collectd.
@@ -677,7 +677,7 @@ static int tss2_read_vserver (vserver_list_t *vserver)
 	 * with an error. */
 	if ((status == 0) && (vserver != NULL))
 	{
-		status = tss2_vserver_gapl (read_fh, write_fh, vserver, &packet_loss);
+		status = tss2_vserver_gapl (read_fh, write_fh, &packet_loss);
 		if (status == 0)
 		{
 			valid |= 0x20;
diff --git a/src/thermal.c b/src/thermal.c
index 79033b17..2ea6a24f 100644
--- a/src/thermal.c
+++ b/src/thermal.c
@@ -60,8 +60,8 @@ static void thermal_submit (const char *plugin_instance, enum dev_type dt,
 	plugin_dispatch_values (&vl);
 }
 
-static int thermal_sysfs_device_read (const char *dir, const char *name,
-		void *user_data)
+static int thermal_sysfs_device_read (const char __attribute__((unused)) *dir,
+		const char *name, void __attribute__((unused)) *user_data)
 {
 	char filename[256];
 	char data[1024];
@@ -112,8 +112,8 @@ static int thermal_sysfs_device_read (const char *dir, const char *name,
 	return ok ? 0 : -1;
 }
 
-static int thermal_procfs_device_read (const char *dir, const char *name,
-		void *user_data)
+static int thermal_procfs_device_read (const char __attribute__((unused)) *dir,
+		const char *name, void __attribute__((unused)) *user_data)
 {
 	const char str_temp[] = "temperature:";
 	char filename[256];
diff --git a/src/unixsock.c b/src/unixsock.c
index 3bdd8c27..57f34501 100644
--- a/src/unixsock.c
+++ b/src/unixsock.c
@@ -278,7 +278,7 @@ static void *us_handle_client (void *arg)
 	return ((void *) 0);
 } /* void *us_handle_client */
 
-static void *us_server_thread (void *arg)
+static void *us_server_thread (void __attribute__((unused)) *arg)
 {
 	int  status;
 	int *remote_fd;
diff --git a/src/utils_dns.c b/src/utils_dns.c
index c16b3c12..b7dc7913 100644
--- a/src/utils_dns.c
+++ b/src/utils_dns.c
@@ -337,9 +337,7 @@ rfc1035NameUnpack(const char *buf, size_t sz, off_t * off, char *name, size_t ns
 }
 
 static int
-handle_dns(const char *buf, int len,
-	const struct in6_addr *s_addr,
-	const struct in6_addr *d_addr)
+handle_dns(const char *buf, int len)
 {
     rfc1035_header_t qh;
     uint16_t us;
@@ -412,16 +410,14 @@ handle_dns(const char *buf, int len,
 }
 
 static int
-handle_udp(const struct udphdr *udp, int len,
-	const struct in6_addr *s_addr,
-	const struct in6_addr *d_addr)
+handle_udp(const struct udphdr *udp, int len)
 {
     char buf[PCAP_SNAPLEN];
     if ((ntohs (udp->UDP_DEST) != 53)
 		    && (ntohs (udp->UDP_SRC) != 53))
 	return 0;
     memcpy(buf, udp + 1, len - sizeof(*udp));
-    if (0 == handle_dns(buf, len - sizeof(*udp), s_addr, d_addr))
+    if (0 == handle_dns(buf, len - sizeof(*udp)))
 	return 0;
     return 1;
 }
@@ -492,7 +488,7 @@ handle_ipv6 (struct ip6_hdr *ipv6, int len)
 	return (0);
 
     memcpy (buf, (char *) ipv6 + offset, payload_len);
-    if (handle_udp ((struct udphdr *) buf, payload_len, &s_addr, &d_addr) == 0)
+    if (handle_udp ((struct udphdr *) buf, payload_len) == 0)
 	return (0);
 
     return (1); /* Success */
@@ -516,7 +512,7 @@ handle_ip(const struct ip *ip, int len)
     if (IPPROTO_UDP != ip->ip_p)
 	return 0;
     memcpy(buf, (void *) ip + offset, len - offset);
-    if (0 == handle_udp((struct udphdr *) buf, len - offset, &s_addr, &d_addr))
+    if (0 == handle_udp((struct udphdr *) buf, len - offset))
 	return 0;
     return 1;
 }
diff --git a/src/utils_match.c b/src/utils_match.c
index 9e75e4e2..906d7c70 100644
--- a/src/utils_match.c
+++ b/src/utils_match.c
@@ -68,7 +68,7 @@ static char *match_substr (const char *str, int begin, int end)
   return (ret);
 } /* char *match_substr */
 
-static int default_callback (const char *str,
+static int default_callback (const char __attribute__((unused)) *str,
     char * const *matches, size_t matches_num, void *user_data)
 {
   cu_match_value_t *data = (cu_match_value_t *) user_data;
diff --git a/src/utils_tail_match.c b/src/utils_tail_match.c
index 26e95311..ae1f4f75 100644
--- a/src/utils_tail_match.c
+++ b/src/utils_tail_match.c
@@ -99,7 +99,8 @@ static int simple_submit_match (cu_match_t *match, void *user_data)
   return (0);
 } /* int simple_submit_match */
 
-static int tail_callback (void *data, char *buf, int buflen)
+static int tail_callback (void *data, char *buf,
+    int __attribute__((unused)) buflen)
 {
   cu_tail_match_t *obj = (cu_tail_match_t *) data;
   int i;
diff --git a/src/utils_threshold.c b/src/utils_threshold.c
index fd6257c5..1b211385 100644
--- a/src/utils_threshold.c
+++ b/src/utils_threshold.c
@@ -689,7 +689,7 @@ static int ut_report_state (const data_set_t *ds,
  * Does not fail.
  */
 static int ut_check_one_data_source (const data_set_t *ds,
-    const value_list_t *vl,
+    const value_list_t __attribute__((unused)) *vl,
     const threshold_t *th,
     const gauge_t *values,
     int ds_index)
-- 
2.11.0