Change PrrtSocket_bind return type to int, Add error message to python bindings

prrt/cprrt.pxd

@@ -120,7 +120,7 @@ cdef extern from "proto/socket.h":
     ctypedef prrtSocket PrrtSocket
 
     cdef PrrtSocket* PrrtSocket_create(const uint32_t maximum_payload_size, const uint32_t target_delay)
-    bint PrrtSocket_bind(PrrtSocket *sock_ptr, const_char *ipAddress, const uint16_t port)
+    int PrrtSocket_bind(PrrtSocket *sock_ptr, const_char *ipAddress, const uint16_t port)
     int PrrtSocket_close(const PrrtSocket *sock_ptr)
     int PrrtSocket_connect(PrrtSocket *sock_ptr, const_char *host, const uint16_t port)
     int PrrtSocket_send_sync(PrrtSocket *sock_ptr, const uint8_t *data, const size_t data_len)

prrt/proto/socket.c

@@ -134,7 +134,7 @@ bool PrrtSocket_enable_hardware_timestamping(PrrtSocket *s, const char * interfa
     return false;
 }
 
-bool PrrtSocket_bind(PrrtSocket *s, const char *ipAddress, const uint16_t port) {
+int PrrtSocket_bind(PrrtSocket *s, const char *ipAddress, const uint16_t port) {
     check(port <= 65534, "Port %d cannot be bound to.", port);
 
     size_t size = sizeof(struct sockaddr_in);
@@ -205,10 +205,13 @@ bool PrrtSocket_bind(PrrtSocket *s, const char *ipAddress, const uint16_t port)
 
     s->isBound = true;
 
-    return true;
+    return 0;
     error:
     PrrtSocket_close(s);
-    return false;
+    if (h_errno) {
+        return h_errno;
+    }
+    return -2;
 }
 
 bool PrrtSocket_connect(PrrtSocket *s, const char *host, const uint16_t port) {

prrt/proto/socket.h

@@ -99,7 +99,7 @@ bool PrrtSocket_enable_hardware_timestamping(PrrtSocket *s, const char * interfa
 
 bool PrrtSocket_enable_thread_pinning(PrrtSocket *s);
 
-bool PrrtSocket_bind(PrrtSocket *s, const char *ipAddress, const uint16_t port);
+int PrrtSocket_bind(PrrtSocket *s, const char *ipAddress, const uint16_t port);
 
 bool PrrtSocket_set_sock_opt(PrrtSocket *s, const char *name, const uint32_t value);
 

prrt/prrt.pyx

@@ -150,12 +150,20 @@ cdef class PrrtSocket:
         self._c_socket = cprrt.PrrtSocket_create(maximum_payload_size, target_delay_us)
         if thread_pinning:
             cprrt.PrrtSocket_enable_thread_pinning(self._c_socket)
-        if not cprrt.PrrtSocket_bind(self._c_socket, host.encode("utf8"), port):
+        h_errno = cprrt.PrrtSocket_bind(self._c_socket, host.encode("utf8"), port)
+        if h_errno != 0:
             # PrrtSocket_bind calls PrrtSocket_close on error
             # so we need to set _c_socket to NULL because otherwise __dealloc__
             # will attempt to call PrrtSocket_close again on the closed socket
             self._c_socket = NULL
-            raise ValueError("PrrtSocket_bind failed")
+            # TODO: use hstrerror() instead
+            raise ValueError("PrrtSocket_bind failed: " + ({
+                1: 'host not found.',
+                2: 'try again.',
+                3: 'no recovery.',
+                4: 'no data.',
+                -1: 'netdb internal error.',
+            }).get(h_errno, 'unknown error.'))
 
     # Channel Properties
     property data_rate_btl_fwd:

prrt/receiver.c

@@ -108,7 +108,7 @@ int main(int argc, char **argv) {
         PrrtSocket_enable_thread_pinning(s);
     }
 
-    check(PrrtSocket_bind(s, "0.0.0.0", arguments.port), "bind failed");
+    check(PrrtSocket_bind(s, "0.0.0.0", arguments.port) == 0, "bind failed");
 
     XlapTimestampTable *tstable_data = malloc(sizeof(XlapTimestampTable));
     XlapTimestampTable *tstable_redundancy = malloc(sizeof(XlapTimestampTable));