dtls_writes: Handle write errors

obgm · Jun 21, 2024 · b1d305c · b1d305c
1 parent 5fbbd27
commit b1d305c
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Showing 2 changed files with 16 additions and 2 deletions.
diff --git a/src/coap_gnutls.c b/src/coap_gnutls.c
@@ -1959,9 +1959,16 @@ coap_dgram_write(gnutls_transport_ptr_t context, const void *send_buffer,
  result = c_session->sock.lfunc[COAP_LAYER_TLS].l_write(c_session,
  send_buffer, send_buffer_length);
  if (result != (int)send_buffer_length) {
+ int keep_errno = errno;
+
  coap_log_warn("coap_netif_dgrm_write failed (%zd != %zu)\n",
  result, send_buffer_length);
- result = 0;
+ errno = keep_errno;
+ if (result < 0) {
+ return -1;
+ } else {
+ result = 0;
+ }
  }
  } else {
  result = 0;

diff --git a/src/coap_mbedtls.c b/src/coap_mbedtls.c
@@ -239,9 +239,16 @@ coap_dgram_write(void *ctx, const unsigned char *send_buffer,
  result = (int)c_session->sock.lfunc[COAP_LAYER_TLS].l_write(c_session,
  send_buffer, send_buffer_length);
  if (result != (ssize_t)send_buffer_length) {
+ int keep_errno = errno;
+
  coap_log_warn("coap_netif_dgrm_write failed (%zd != %zu)\n",
  result, send_buffer_length);
- result = 0;
+ errno = keep_errno;
+ if (result < 0) {
+ return -1;
+ } else {
+ result = 0;
+ }
  } else if (m_env) {
  coap_tick_t now;
  coap_ticks(&now);