diff --git a/lib/multi.c b/lib/multi.c
index b847f81a7a..99d1adcb51 100644
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -1327,7 +1327,7 @@ static void reset_socket_fdwrite(curl_socket_t s)
   int t;
   int l = (int)sizeof(t);
   if(!getsockopt(s, SOL_SOCKET, SO_TYPE, (char *)&t, &l) && t == SOCK_STREAM)
-    send(s, NULL, 0, 0);
+    swrite(s, NULL, 0);
 }
 #endif
 
diff --git a/lib/vquic/vquic.c b/lib/vquic/vquic.c
index 5cf4b0f90c..1b7dc1d3aa 100644
--- a/lib/vquic/vquic.c
+++ b/lib/vquic/vquic.c
@@ -196,8 +196,7 @@ static CURLcode do_sendmsg(struct Curl_cfilter *cf,
 
   *psent = 0;
 
-  while((rv = send(qctx->sockfd, (const char *)pkt,
-                   (SEND_TYPE_ARG3)pktlen, 0)) == -1 &&
+  while((rv = swrite(qctx->sockfd, pkt, pktlen)) == -1 &&
         SOCKERRNO == SOCKEINTR)
     ;
 
diff --git a/scripts/checksrc.pl b/scripts/checksrc.pl
index 4bc868730b..7dab44353b 100755
--- a/scripts/checksrc.pl
+++ b/scripts/checksrc.pl
@@ -101,7 +101,9 @@ my %banfunc = (
     "open" => 1,
     "printf" => 1,
     "realloc" => 1,
+    "recv" => 1,
     "rename" => 1,
+    "send" => 1,
     "snprintf" => 1,
     "socket" => 1,
     "socketpair" => 1,
diff --git a/src/tool_cb_rea.c b/src/tool_cb_rea.c
index 39d0b4ed14..2343d04a13 100644
--- a/src/tool_cb_rea.c
+++ b/src/tool_cb_rea.c
@@ -114,7 +114,7 @@ size_t tool_read_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
    execute */
   if(per->uploadfile && !strcmp(per->uploadfile, ".") && per->infd > 0) {
 #ifndef CURL_WINDOWS_UWP
-    rc = recv(per->infd, buffer, curlx_uztosi(sz * nmemb), 0);
+    rc = sread(per->infd, buffer, curlx_uztosi(sz * nmemb));
     if(rc < 0) {
       if(SOCKERRNO == SOCKEWOULDBLOCK) {
         errno = 0;
diff --git a/src/tool_doswin.c b/src/tool_doswin.c
index 27593c6636..eb73f23a41 100644
--- a/src/tool_doswin.c
+++ b/src/tool_doswin.c
@@ -737,7 +737,7 @@ static DWORD WINAPI win_stdin_thread_func(void *thread_data)
       break;
     if(n == 0)
       break;
-    nwritten = send(socket_w, buffer, n, 0);
+    nwritten = swrite(socket_w, buffer, n);
     if(nwritten == -1)
       break;
     if((DWORD)nwritten != n)
diff --git a/tests/server/sockfilt.c b/tests/server/sockfilt.c
index fb1282df03..2153498929 100644
--- a/tests/server/sockfilt.c
+++ b/tests/server/sockfilt.c
@@ -703,7 +703,7 @@ static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
         wsaevent = WSACreateEvent();
         if(wsaevent != WSA_INVALID_EVENT) {
           if(wsaevents.lNetworkEvents & FD_WRITE) {
-            send(wsasock, NULL, 0, 0); /* reset FD_WRITE */
+            swrite(wsasock, NULL, 0); /* reset FD_WRITE */
           }
           error = WSAEventSelect(wsasock, wsaevent, wsaevents.lNetworkEvents);
           if(error != SOCKET_ERROR) {
diff --git a/tests/server/socksd.c b/tests/server/socksd.c
index b9ab49436e..2fa11530c6 100644
--- a/tests/server/socksd.c
+++ b/tests/server/socksd.c
@@ -306,7 +306,7 @@ static curl_socket_t sockit(curl_socket_t fd)
 
   socksd_getconfig();
 
-  rc = recv(fd, (char *)buffer, sizeof(buffer), 0);
+  rc = sread(fd, buffer, sizeof(buffer));
   if(rc <= 0) {
     logmsg("SOCKS identifier message missing, recv returned %zd", rc);
     return CURL_SOCKET_BAD;
@@ -353,7 +353,7 @@ static curl_socket_t sockit(curl_socket_t fd)
   loghex(response, rc);
 
   /* expect the request or auth */
-  rc = recv(fd, (char *)buffer, sizeof(buffer), 0);
+  rc = sread(fd, buffer, sizeof(buffer));
   if(rc <= 0) {
     logmsg("SOCKS5 request or auth message missing, recv returned %zd", rc);
     return CURL_SOCKET_BAD;
@@ -412,7 +412,7 @@ static curl_socket_t sockit(curl_socket_t fd)
       return CURL_SOCKET_BAD;
 
     /* expect the request */
-    rc = recv(fd, (char *)buffer, sizeof(buffer), 0);
+    rc = sread(fd, buffer, sizeof(buffer));
     if(rc <= 0) {
       logmsg("SOCKS5 request message missing, recv returned %zd", rc);
       return CURL_SOCKET_BAD;
@@ -581,9 +581,9 @@ static int tunnel(struct perclient *cp, fd_set *fds)
   char buffer[512];
   if(FD_ISSET(cp->clientfd, fds)) {
     /* read from client, send to remote */
-    nread = recv(cp->clientfd, buffer, sizeof(buffer), 0);
+    nread = sread(cp->clientfd, buffer, sizeof(buffer));
     if(nread > 0) {
-      nwrite = send(cp->remotefd, (char *)buffer, (SEND_TYPE_ARG3)nread, 0);
+      nwrite = swrite(cp->remotefd, buffer, nread);
       if(nwrite != nread)
         return 1;
       cp->fromclient += nwrite;
@@ -593,9 +593,9 @@ static int tunnel(struct perclient *cp, fd_set *fds)
   }
   if(FD_ISSET(cp->remotefd, fds)) {
     /* read from remote, send to client */
-    nread = recv(cp->remotefd, buffer, sizeof(buffer), 0);
+    nread = sread(cp->remotefd, buffer, sizeof(buffer));
     if(nread > 0) {
-      nwrite = send(cp->clientfd, (char *)buffer, (SEND_TYPE_ARG3)nread, 0);
+      nwrite = swrite(cp->clientfd, buffer, nread);
       if(nwrite != nread)
         return 1;
       cp->fromremote += nwrite;