Merged in dstaesse/ouroboros/be-tim (pull request #464)

lib, irmd: Implement flow allocation timeout

6 files changed, 213 insertions, 112 deletions

diff --git a/src/irmd/api_table.c b/src/irmd/api_table.c
index 5ff0fcf6..268f8231 100644
--- a/src/irmd/api_table.c
+++ b/src/irmd/api_table.c
@@ -31,14 +31,17 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <limits.h>
+#include <assert.h>
 
-struct api_entry * api_entry_create(pid_t api, char * apn)
+#define ENTRY_SLEEP_TIMEOUT 10 /* ms */
+
+struct api_entry * api_entry_create(pid_t  api,
+                                    char * apn)
 {
         struct api_entry * e;
         pthread_condattr_t cattr;
 
-        if (apn == NULL)
-                return NULL;
+        assert(apn);
 
         e = malloc(sizeof(*e));
         if (e == NULL)
@@ -84,8 +87,7 @@ void api_entry_destroy(struct api_entry * e)
         struct list_head * p;
         struct list_head * h;
 
-        if (e == NULL)
-                return;
+        assert(e);
 
         pthread_mutex_lock(&e->state_lock);
 
@@ -121,11 +123,13 @@ void api_entry_destroy(struct api_entry * e)
         free(e);
 }
 
-int api_entry_add_name(struct api_entry * e, char * name)
+int api_entry_add_name(struct api_entry * e,
+                       char *             name)
 {
         struct str_el * s;
-        if (e == NULL || name == NULL)
-                return -EINVAL;
+
+        assert(e);
+        assert(name);
 
         s = malloc(sizeof(*s));
         if (s == NULL)
@@ -137,11 +141,15 @@ int api_entry_add_name(struct api_entry * e, char * name)
         return 0;
 }
 
-void api_entry_del_name(struct api_entry * e, char * name)
+void api_entry_del_name(struct api_entry * e,
+                        char *             name)
 {
         struct list_head * p = NULL;
         struct list_head * h = NULL;
 
+        assert(e);
+        assert(name);
+
         list_for_each_safe(p, h, &e->names) {
                 struct str_el * s = list_entry(p, struct str_el, next);
                 if (!wildcard_match(name, s->str)) {
@@ -153,31 +161,34 @@ void api_entry_del_name(struct api_entry * e, char * name)
         }
 }
 
+void api_entry_cancel(struct api_entry * e)
+{
+        pthread_mutex_lock(&e->state_lock);
+
+        e->state = API_INIT;
+        pthread_cond_broadcast(&e->state_cond);
+
+        pthread_mutex_unlock(&e->state_lock);
+}
+
 int api_entry_sleep(struct api_entry * e)
 {
-        struct timespec timeout = {(IRMD_ACCEPT_TIMEOUT / 1000),
-                                   (IRMD_ACCEPT_TIMEOUT % 1000) * MILLION};
+        struct timespec timeout = {(ENTRY_SLEEP_TIMEOUT / 1000),
+                                   (ENTRY_SLEEP_TIMEOUT % 1000) * MILLION};
         struct timespec now;
         struct timespec dl;
 
         int ret = 0;
 
-        if (e == NULL)
-                return -EINVAL;
-
-        e->re = NULL;
+        assert(e);
 
         clock_gettime(PTHREAD_COND_CLOCK, &now);
-
         ts_add(&now, &timeout, &dl);
 
         pthread_mutex_lock(&e->state_lock);
-        if (e->state != API_INIT) {
-                pthread_mutex_unlock(&e->state_lock);
-                return -EINVAL;
-        }
 
-        e->state = API_SLEEP;
+        if (e->state != API_WAKE && e->state != API_DESTROY)
+                e->state = API_SLEEP;
 
         while (e->state == API_SLEEP && ret != -ETIMEDOUT)
                 ret = -pthread_cond_timedwait(&e->state_cond,
@@ -190,17 +201,20 @@ int api_entry_sleep(struct api_entry * e)
                 ret = -1;
         }
 
-        e->state = API_INIT;
+        if (ret != -ETIMEDOUT)
+                e->state = API_INIT;
+
         pthread_cond_broadcast(&e->state_cond);
         pthread_mutex_unlock(&e->state_lock);
 
         return ret;
 }
 
-void api_entry_wake(struct api_entry * e, struct reg_entry * re)
+void api_entry_wake(struct api_entry * e,
+                    struct reg_entry * re)
 {
-        if (e == NULL)
-                return;
+        assert(e);
+        assert(re);
 
         pthread_mutex_lock(&e->state_lock);
 
@@ -217,24 +231,32 @@ void api_entry_wake(struct api_entry * e, struct reg_entry * re)
         while (e->state == API_WAKE)
                 pthread_cond_wait(&e->state_cond, &e->state_lock);
 
+        if (e->state == API_DESTROY)
+                e->state = API_INIT;
+
         pthread_mutex_unlock(&e->state_lock);
 }
 
-int api_table_add(struct list_head * api_table, struct api_entry * e)
+int api_table_add(struct list_head * api_table,
+                  struct api_entry * e)
 {
-        if (api_table == NULL || e == NULL)
-                return -EINVAL;
+
+        assert(api_table);
+        assert(e);
 
         list_add(&e->next, api_table);
 
         return 0;
 }
 
-void api_table_del(struct list_head * api_table, pid_t api)
+void api_table_del(struct list_head * api_table,
+                   pid_t              api)
 {
         struct list_head * p;
         struct list_head * h;
 
+        assert(api_table);
+
         list_for_each_safe(p, h, api_table) {
                 struct api_entry * e = list_entry(p, struct api_entry, next);
                 if (api == e->api) {
@@ -244,10 +266,13 @@ void api_table_del(struct list_head * api_table, pid_t api)
         }
 }
 
-struct api_entry * api_table_get(struct list_head * api_table, pid_t api)
+struct api_entry * api_table_get(struct list_head * api_table,
+                                 pid_t              api)
 {
         struct list_head * h;
 
+        assert(api_table);
+
         list_for_each(h, api_table) {
                 struct api_entry * e = list_entry(h, struct api_entry, next);
                 if (api == e->api)
diff --git a/src/irmd/api_table.h b/src/irmd/api_table.h
index c7998c7f..f9c4d0aa 100644
--- a/src/irmd/api_table.h
+++ b/src/irmd/api_table.h
@@ -61,6 +61,8 @@ int                api_entry_sleep(struct api_entry * e);
 void               api_entry_wake(struct api_entry * e,
                                   struct reg_entry * re);
 
+void               api_entry_cancel(struct api_entry * e);
+
 int                api_entry_add_name(struct api_entry * e,
                                       char *             name);
 
diff --git a/src/irmd/ipcp.c b/src/irmd/ipcp.c
index a8263580..eb0c2de0 100644
--- a/src/irmd/ipcp.c
+++ b/src/irmd/ipcp.c
@@ -53,10 +53,12 @@ ipcp_msg_t * send_recv_ipcp_msg(pid_t        api,
        char * sock_path = NULL;
        ssize_t count = 0;
        ipcp_msg_t * recv_msg = NULL;
-
        struct timeval tv = {(SOCKET_TIMEOUT / 1000),
                             (SOCKET_TIMEOUT % 1000) * 1000};
 
+       if (kill(api, 0) < 0)
+               return NULL;
+
        sock_path = ipcp_sock_path(api);
        if (sock_path == NULL)
                return NULL;
@@ -67,10 +69,6 @@ ipcp_msg_t * send_recv_ipcp_msg(pid_t        api,
                return NULL;
        }
 
-       if (setsockopt(sockfd, SOL_SOCKET, SO_RCVTIMEO,
-                      (void *) &tv, sizeof(tv)))
-               log_warn("Failed to set timeout on socket.");
-
        free(sock_path);
 
        buf.len = ipcp_msg__get_packed_size(msg);
@@ -85,6 +83,10 @@ ipcp_msg_t * send_recv_ipcp_msg(pid_t        api,
                return NULL;
        }
 
+       if (setsockopt(sockfd, SOL_SOCKET, SO_RCVTIMEO,
+                      (void *) &tv, sizeof(tv)))
+               log_warn("Failed to set timeout on socket.");
+
        pthread_cleanup_push(close_ptr, (void *) &sockfd);
        pthread_cleanup_push((void (*)(void *)) free, (void *) buf.data);
 
@@ -184,7 +186,7 @@ int ipcp_destroy(pid_t api)
         return 0;
 }
 
-int ipcp_bootstrap(pid_t api,
+int ipcp_bootstrap(pid_t              api,
                    dif_config_msg_t * conf)
 {
         ipcp_msg_t msg = IPCP_MSG__INIT;
diff --git a/src/irmd/irm_flow.c b/src/irmd/irm_flow.c
index 7a02b01a..8b85f36f 100644
--- a/src/irmd/irm_flow.c
+++ b/src/irmd/irm_flow.c
@@ -23,7 +23,9 @@
 #define OUROBOROS_PREFIX "irm_flow"
 
 #include <ouroboros/config.h>
+#include <ouroboros/errno.h>
 #include <ouroboros/logs.h>
+#include <ouroboros/time_utils.h>
 
 #include "irm_flow.h"
 
@@ -142,31 +144,52 @@ void irm_flow_set_state(struct irm_flow * f,
         pthread_mutex_unlock(&f->state_lock);
 }
 
-enum flow_state irm_flow_wait_state(struct irm_flow * f,
-                                    enum flow_state   state)
+int irm_flow_wait_state(struct irm_flow * f,
+                        enum flow_state   state,
+                        struct timespec * timeo)
 {
+        int ret = 0;
+        int s;
+
+        struct timespec dl;
+
         assert(f);
         assert(state != FLOW_NULL);
         assert(state != FLOW_DESTROY);
         assert(state != FLOW_DEALLOC_PENDING);
 
+        if (timeo != NULL) {
+                clock_gettime(PTHREAD_COND_CLOCK, &dl);
+                ts_add(&dl, timeo, &dl);
+        }
+
         pthread_mutex_lock(&f->state_lock);
 
         assert(f->state != FLOW_NULL);
 
         while (!(f->state == state ||
                  f->state == FLOW_DESTROY ||
-                 f->state == FLOW_DEALLOC_PENDING))
-                pthread_cond_wait(&f->state_cond, &f->state_lock);
+                 f->state == FLOW_DEALLOC_PENDING) &&
+               ret != -ETIMEDOUT) {
+                if (timeo == NULL)
+                        ret = -pthread_cond_wait(&f->state_cond,
+                                                 &f->state_lock);
+                else
+                        ret = -pthread_cond_timedwait(&f->state_cond,
+                                                      &f->state_lock,
+                                                      &dl);
+        }
 
-        if (f->state == FLOW_DESTROY || f->state == FLOW_DEALLOC_PENDING) {
+        if (f->state == FLOW_DESTROY ||
+            f->state == FLOW_DEALLOC_PENDING ||
+            ret == -ETIMEDOUT) {
                 f->state = FLOW_NULL;
                 pthread_cond_broadcast(&f->state_cond);
         }
 
-        state = f->state;
+        s = f->state;
 
         pthread_mutex_unlock(&f->state_lock);
 
-        return state;
+        return ret ? ret : s;
 }
diff --git a/src/irmd/irm_flow.h b/src/irmd/irm_flow.h
index 97770117..8902a6ab 100644
--- a/src/irmd/irm_flow.h
+++ b/src/irmd/irm_flow.h
@@ -71,7 +71,8 @@ enum flow_state   irm_flow_get_state(struct irm_flow * f);
 void              irm_flow_set_state(struct irm_flow * f,
                                      enum flow_state   state);
 
-enum flow_state   irm_flow_wait_state(struct irm_flow * f,
-                                      enum flow_state   state);
+int               irm_flow_wait_state(struct irm_flow * f,
+                                      enum flow_state   state,
+                                      struct timespec * timeo);
 
 #endif /* OUROBOROS_IRMD_IRM_FLOW_H */
diff --git a/src/irmd/main.c b/src/irmd/main.c
index 673e39ea..41beb049 100644
--- a/src/irmd/main.c
+++ b/src/irmd/main.c
@@ -983,23 +983,33 @@ static int api_announce(pid_t  api,
         return 0;
 }
 
-static struct irm_flow * flow_accept(pid_t api)
+static int flow_accept(pid_t              api,
+                       struct timespec *  timeo,
+                       struct irm_flow ** fl)
 {
-        struct irm_flow *  f  = NULL;
+        struct irm_flow  * f  = NULL;
         struct api_entry * e  = NULL;
         struct reg_entry * re = NULL;
         struct list_head * p  = NULL;
 
+        struct timespec dl;
+        struct timespec now;
+
         pid_t api_n1;
         pid_t api_n;
         int   port_id;
         int   ret;
 
+        if (timeo != NULL) {
+                clock_gettime(PTHREAD_COND_CLOCK, &now);
+                ts_add(&now, timeo, &dl);
+        }
+
         pthread_rwlock_rdlock(&irmd.state_lock);
 
         if (irmd.state != IRMD_RUNNING) {
                 pthread_rwlock_unlock(&irmd.state_lock);
-                return NULL;
+                return -EIRMD;
         }
 
         pthread_rwlock_wrlock(&irmd.reg_lock);
@@ -1010,7 +1020,7 @@ static struct irm_flow * flow_accept(pid_t api)
                 pthread_rwlock_unlock(&irmd.reg_lock);
                 pthread_rwlock_unlock(&irmd.state_lock);
                 log_err("Unknown instance %d calling accept.", api);
-                return NULL;
+                return -EINVAL;
         }
 
         log_dbg("New instance (%d) of %s added.", api, e->apn);
@@ -1027,18 +1037,33 @@ static struct irm_flow * flow_accept(pid_t api)
         pthread_rwlock_unlock(&irmd.reg_lock);
         pthread_rwlock_unlock(&irmd.state_lock);
 
-        while ((ret = api_entry_sleep(e)) == -ETIMEDOUT) {
+        while (true) {
+                if (timeo != NULL && ts_diff_ns(&now, &dl) < 0) {
+                        log_dbg("Accept timed out.");
+                        return -ETIMEDOUT;
+                }
+
                 pthread_rwlock_rdlock(&irmd.state_lock);
+
                 if (irmd.state != IRMD_RUNNING) {
                         pthread_rwlock_unlock(&irmd.state_lock);
-                        return NULL;
+                        return -EIRMD;
                 }
+
                 pthread_rwlock_unlock(&irmd.state_lock);
-        }
 
-        if (ret == -1) {
-                /* The process died, we can exit here. */
-                return NULL;
+                ret = api_entry_sleep(e);
+                if (ret == -ETIMEDOUT) {
+                        clock_gettime(PTHREAD_COND_CLOCK, &now);
+                        api_entry_cancel(e);
+                        continue;
+                }
+
+                if (ret == -1)
+                        return -EPIPE;
+
+                if (ret == 0)
+                        break;
         }
 
         pthread_rwlock_rdlock(&irmd.state_lock);
@@ -1046,7 +1071,7 @@ static struct irm_flow * flow_accept(pid_t api)
         if (irmd.state != IRMD_RUNNING) {
                 reg_entry_set_state(re, REG_NAME_NULL);
                 pthread_rwlock_unlock(&irmd.state_lock);
-                return NULL;
+                return -EIRMD;
         }
 
         pthread_rwlock_rdlock(&irmd.flows_lock);
@@ -1056,7 +1081,7 @@ static struct irm_flow * flow_accept(pid_t api)
                 pthread_rwlock_unlock(&irmd.flows_lock);
                 pthread_rwlock_unlock(&irmd.state_lock);
                 log_warn("Port_id was not created yet.");
-                return NULL;
+                return -EPERM;
         }
 
         api_n   = f->n_api;
@@ -1079,7 +1104,7 @@ static struct irm_flow * flow_accept(pid_t api)
                 irm_flow_set_state(f, FLOW_NULL);
                 irm_flow_destroy(f);
                 log_dbg("Process gone while accepting flow.");
-                return NULL;
+                return -EPERM;
         }
 
         pthread_mutex_lock(&e->state_lock);
@@ -1100,7 +1125,7 @@ static struct irm_flow * flow_accept(pid_t api)
                 irm_flow_set_state(f, FLOW_NULL);
                 irm_flow_destroy(f);
                 log_err("Entry in wrong state.");
-                return NULL;
+                return -EPERM;
         }
 
         registry_del_api(&irmd.registry, api);
@@ -1118,29 +1143,34 @@ static struct irm_flow * flow_accept(pid_t api)
                 clear_irm_flow(f);
                 irm_flow_set_state(f, FLOW_NULL);
                 irm_flow_destroy(f);
-                return NULL;
+                return -EPERM;
         }
 
         irm_flow_set_state(f, FLOW_ALLOCATED);
 
         log_info("Flow on port_id %d allocated.", f->port_id);
 
-        return f;
+        *fl = f;
+
+        return 0;
 }
 
-static struct irm_flow * flow_alloc(pid_t     api,
-                                    char *    dst_name,
-                                    qoscube_t cube)
+static int flow_alloc(pid_t              api,
+                      char *             dst_name,
+                      qoscube_t          cube,
+                      struct timespec *  timeo,
+                      struct irm_flow ** e)
 {
         struct irm_flow * f;
-        pid_t ipcp;
-        int port_id;
+        pid_t             ipcp;
+        int               port_id;
+        int               state;
 
         pthread_rwlock_rdlock(&irmd.state_lock);
 
         if (irmd.state != IRMD_RUNNING) {
                 pthread_rwlock_unlock(&irmd.state_lock);
-                return NULL;
+                return -1;
         }
 
         pthread_rwlock_rdlock(&irmd.reg_lock);
@@ -1150,7 +1180,7 @@ static struct irm_flow * flow_alloc(pid_t     api,
                 pthread_rwlock_unlock(&irmd.reg_lock);
                 pthread_rwlock_unlock(&irmd.state_lock);
                 log_info("Destination unreachable.");
-                return NULL;
+                return -1;
         }
 
         pthread_rwlock_unlock(&irmd.reg_lock);
@@ -1160,7 +1190,7 @@ static struct irm_flow * flow_alloc(pid_t     api,
                 pthread_rwlock_unlock(&irmd.flows_lock);
                 pthread_rwlock_unlock(&irmd.state_lock);
                 log_err("Could not allocate port_id.");
-                return NULL;
+                return -EBADF;
         }
 
         f = irm_flow_create(api, ipcp, port_id, cube);
@@ -1169,7 +1199,7 @@ static struct irm_flow * flow_alloc(pid_t     api,
                 pthread_rwlock_unlock(&irmd.flows_lock);
                 pthread_rwlock_unlock(&irmd.state_lock);
                 log_err("Could not allocate port_id.");
-                return NULL;
+                return -ENOMEM;
         }
 
         list_add(&f->next, &irmd.irm_flows);
@@ -1179,22 +1209,30 @@ static struct irm_flow * flow_alloc(pid_t     api,
 
         assert(irm_flow_get_state(f) == FLOW_ALLOC_PENDING);
 
-        if (ipcp_flow_alloc(ipcp, port_id, api, dst_name, cube) < 0) {
+        if (ipcp_flow_alloc(ipcp, port_id, api, dst_name, cube)) {
                 /* sanitizer cleans this */
-                log_info("Failed to respond to alloc.");
-                return NULL;
+                log_info("Flow_allocation failed.");
+                return -EAGAIN;
         }
 
-        if (irm_flow_wait_state(f, FLOW_ALLOCATED) != FLOW_ALLOCATED) {
-                log_info("Pending flow on port_id %d torn down.", port_id);
-                return NULL;
+        state = irm_flow_wait_state(f, FLOW_ALLOCATED, timeo);
+        if (state != FLOW_ALLOCATED) {
+                if (state == -ETIMEDOUT) {
+                        log_dbg("Flow allocation timed out");
+                        return -ETIMEDOUT;
+                }
+
+                log_info("Pending flow to %s torn down.", dst_name);
+                return -EPIPE;
         }
 
         assert(irm_flow_get_state(f) == FLOW_ALLOCATED);
 
+        *e = f;
+
         log_info("Flow on port_id %d allocated.", port_id);
 
-        return f;
+        return 0;
 }
 
 static int flow_dealloc(pid_t api,
@@ -1382,7 +1420,6 @@ static struct irm_flow * flow_req_arr(pid_t     api,
                 return NULL;
         }
 
-
         pthread_rwlock_unlock(&irmd.reg_lock);
         pthread_rwlock_wrlock(&irmd.flows_lock);
         port_id = bmp_allocate(irmd.port_ids);
@@ -1798,15 +1835,17 @@ void * mainloop(void * o)
                 struct timeval timeout = {(IRMD_ACCEPT_TIMEOUT / 1000),
                                           (IRMD_ACCEPT_TIMEOUT % 1000) * 1000};
 #endif
-                int cli_sockfd;
-                irm_msg_t * msg;
-                ssize_t count;
-                buffer_t buffer;
-                irm_msg_t ret_msg = IRM_MSG__INIT;
-                struct irm_flow * e = NULL;
-                pid_t * apis = NULL;
-                struct timeval tv = {(SOCKET_TIMEOUT / 1000),
-                                     (SOCKET_TIMEOUT % 1000) * 1000};
+                int               cli_sockfd;
+                irm_msg_t *       msg;
+                ssize_t           count;
+                buffer_t          buffer;
+                irm_msg_t         ret_msg = IRM_MSG__INIT;
+                struct irm_flow * e       = NULL;
+                pid_t *           apis    = NULL;
+                struct timespec * timeo   = NULL;
+                struct timespec   ts      = {0, 0};
+                struct timeval    tv      = {(SOCKET_TIMEOUT / 1000),
+                                             (SOCKET_TIMEOUT % 1000) * 1000};
 
                 pthread_rwlock_rdlock(&irmd.state_lock);
 
@@ -1849,6 +1888,14 @@ void * mainloop(void * o)
 
                 thread_dec();
 
+                if (msg->has_timeo_sec) {
+                        assert(msg->has_timeo_nsec);
+
+                        ts.tv_sec  = msg->timeo_sec;
+                        ts.tv_nsec = msg->timeo_nsec;
+                        timeo = &ts;
+                }
+
                 switch (msg->code) {
                 case IRM_MSG_CODE__IRM_CREATE_IPCP:
                         ret_msg.has_result = true;
@@ -1897,9 +1944,9 @@ void * mainloop(void * o)
                         ret_msg.result = unbind_api(msg->api, msg->dst_name);
                         break;
                 case IRM_MSG_CODE__IRM_LIST_IPCPS:
+                        ret_msg.has_result = true;
                         ret_msg.n_apis = list_ipcps(msg->dst_name, &apis);
                         ret_msg.apis = apis;
-                        ret_msg.has_result = true;
                         break;
                 case IRM_MSG_CODE__IRM_REG:
                         ret_msg.has_result = true;
@@ -1914,32 +1961,27 @@ void * mainloop(void * o)
                                                     msg->n_dif_name);
                         break;
                 case IRM_MSG_CODE__IRM_FLOW_ACCEPT:
-                        e = flow_accept(msg->api);
-                        if (e == NULL) {
-                                ret_msg.has_result = true;
-                                ret_msg.result = -EIRMD;
-                                break;
+                        ret_msg.has_result = true;
+                        ret_msg.result = flow_accept(msg->api, timeo, &e);
+                        if (ret_msg.result == 0) {
+                                ret_msg.has_port_id = true;
+                                ret_msg.port_id     = e->port_id;
+                                ret_msg.has_api     = true;
+                                ret_msg.api         = e->n_1_api;
+                                ret_msg.has_qoscube = true;
+                                ret_msg.qoscube     = e->qc;
                         }
-                        ret_msg.has_port_id = true;
-                        ret_msg.port_id     = e->port_id;
-                        ret_msg.has_api     = true;
-                        ret_msg.api         = e->n_1_api;
-                        ret_msg.has_qoscube = true;
-                        ret_msg.qoscube     = e->qc;
                         break;
                 case IRM_MSG_CODE__IRM_FLOW_ALLOC:
-                        e = flow_alloc(msg->api,
-                                       msg->dst_name,
-                                       msg->qoscube);
-                        if (e == NULL) {
-                                ret_msg.has_result = true;
-                                ret_msg.result = -1;
-                                break;
+                        ret_msg.has_result = true;
+                        ret_msg.result = flow_alloc(msg->api, msg->dst_name,
+                                                    msg->qoscube, timeo, &e);
+                        if (ret_msg.result == 0) {
+                                ret_msg.has_port_id = true;
+                                ret_msg.port_id     = e->port_id;
+                                ret_msg.has_api     = true;
+                                ret_msg.api         = e->n_1_api;
                         }
-                        ret_msg.has_port_id = true;
-                        ret_msg.port_id     = e->port_id;
-                        ret_msg.has_api     = true;
-                        ret_msg.api         = e->n_1_api;
                         break;
                 case IRM_MSG_CODE__IRM_FLOW_DEALLOC:
                         ret_msg.has_result = true;
@@ -1949,8 +1991,8 @@ void * mainloop(void * o)
                         e = flow_req_arr(msg->api,
                                          msg->dst_name,
                                          msg->qoscube);
+                        ret_msg.has_result = true;
                         if (e == NULL) {
-                                ret_msg.has_result = true;
                                 ret_msg.result = -1;
                                 break;
                         }
@@ -1971,6 +2013,12 @@ void * mainloop(void * o)
 
                 irm_msg__free_unpacked(msg, NULL);
 
+                if (ret_msg.result == -EPIPE || !ret_msg.has_result) {
+                        close(cli_sockfd);
+                        thread_inc();
+                        continue;
+                }
+
                 buffer.len = irm_msg__get_packed_size(&ret_msg);
                 if (buffer.len == 0) {
                         log_err("Failed to calculate length of reply message.");
@@ -2065,7 +2113,7 @@ void * threadpoolmgr(void * o)
                 if (pthread_cond_timedwait(&irmd.threads_cond,
                                            &irmd.threads_lock,
                                            &dl) == ETIMEDOUT)
-                        if (irmd.threads > IRMD_MIN_AV_THREADS)
+                        if (irmd.threads > IRMD_MIN_AV_THREADS )
                                 --irmd.max_threads;
 
                 pthread_mutex_unlock(&irmd.threads_lock);