initial web server skeleton

concurrency-webserver/src/spin.c

@@ -0,0 +1,52 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+#include <unistd.h>
+
+#define MAXBUF (8192)
+
+//
+// This program is intended to help you test your web server.
+// You can use it to test that you are correctly having multiple threads
+// handling http requests.
+// 
+
+double get_seconds() {
+    struct timeval t;
+    int rc = gettimeofday(&t, NULL);
+    assert(rc == 0);
+    return (double) ((double)t.tv_sec + (double)t.tv_usec / 1e6);
+}
+
+
+int main(int argc, char *argv[]) {
+    // Extract arguments
+    double spin_for = 0.0;
+    char *buf;
+    if ((buf = getenv("QUERY_STRING")) != NULL) {
+	// just expecting a single number
+	spin_for = (double) atoi(buf);
+    }
+
+    double t1 = get_seconds();
+    while ((get_seconds() - t1) < spin_for)
+	sleep(1);
+    double t2 = get_seconds();
+    
+    /* Make the response body */
+    char content[MAXBUF];
+    sprintf(content, "<p>Welcome to the CGI program (%s)</p>\r\n", buf);
+    sprintf(content, "%s<p>My only purpose is to waste time on the server!</p>\r\n", content);
+    sprintf(content, "%s<p>I spun for %.2f seconds</p>\r\n", content, t2 - t1);
+    
+    /* Generate the HTTP response */
+    printf("Content-length: %lu\r\n", strlen(content));
+    printf("Content-type: text/html\r\n\r\n");
+    printf("%s", content);
+    fflush(stdout);
+    
+    exit(0);
+}
+