Spring 2020 version

install-dependencies.sh

@@ -4,6 +4,11 @@
 # Run this script to install the required Jansson and JWT packages.
 #
 BASE=`pwd`
+#
+# Running this script multiple times will wipe the existing build
+# and reclone both repositories
+/bin/rm -rf ${BASE}/deps jansson libjwt
+#
 test -d ${BASE}/deps || mkdir ${BASE}/deps
 git clone https://github.com/akheron/jansson.git
 (cd jansson;

src/Makefile

@@ -22,4 +22,4 @@ server: $(OBJ)
 	$(CC) $(LDFLAGS) -o $@ $(OBJ) $(LDLIBS) 
 
 clean:
-	/bin/rm $(OBJ) $(OTHERS)
+	/bin/rm -f $(OBJ) $(OTHERS) server

src/bufio.h

@@ -3,7 +3,8 @@
 
 #include "buffer.h"
 
-struct bufio;
+struct bufio;   // opaque type
+                // users should interact only via the public functions below
 struct bufio * bufio_create(int socket);
 void bufio_close(struct bufio * self);
 void bufio_truncate(struct bufio * self);

src/main.c

@@ -74,6 +74,7 @@ main(int ac, char *av[])
 
             case 'e':
                 token_expiration_time = atoi(optarg);
+                fprintf(stderr, "token expiration time is %d\n", token_expiration_time);
                 break;
 
             case 's':

src/socket.c

@@ -13,6 +13,7 @@
 #include <sys/sendfile.h>
 #include <netdb.h>
 #include <netinet/in.h>
+#include <netinet/tcp.h>
 #include <errno.h>
 #include <unistd.h>
 #include <stdio.h>
@@ -127,6 +128,15 @@ socket_accept_client(int accepting_socket)
         return -1;
     }
 
+    /* Performance tuning.  Turn off Nagle's algorithm.
+     * Otherwise, when the servers sends a reply to the client, and the reply
+     * is small relative to the MSS size, there would be a delay of 40ms
+     * during which the OS would hope in vain for more data to be sent.
+     * See tcp(7)
+     */
+    int i = 1;
+    setsockopt(client, IPPROTO_TCP, TCP_NODELAY, (void *)&i, sizeof(i));
+
     /* The following will help with debugging your server.
      * Adjust and/or remove as you see fit.
      */