lab5 materials

Author: yqh

ece252_manual.pdf

@@ -0,0 +1,30 @@
+# Makefile, ECE252  
+# Yiqing Huang
+
+CC = gcc 
+CFLAGS_LIBS = $(shell pkg-config --cflags libxml-2.0 libcurl)
+CFLAGS = -Wall $(CFLAGS_LIBS) -std=gnu99 -g
+LD = gcc
+LDFLAGS = -std=gnu99 -g 
+LDLIBS = $(shell pkg-config --libs libxml-2.0 libcurl)
+
+SRCS   = curl_multi_test.c
+OBJS1  = curl_multi_test.o
+TARGETS= curl_multi_test.out 
+
+all: ${TARGETS}
+
+curl_multi_test.out: $(OBJS1) 
+	$(LD) -o $@ $^ $(LDLIBS) $(LDFLAGS) 
+
+%.o: %.c 
+	$(CC) $(CFLAGS) -c $< 
+
+%.d: %.c
+	gcc -MM -MF $@ $<
+
+-include $(SRCS:.c=.d)
+
+.PHONY: clean
+clean:
+	rm -f *~ *.d *.o $(TARGETS) 

lab5/starter/curl_multi/Makefile

@@ -0,0 +1,120 @@
+/* curl_multi_test.c
+
+   Clemens Gruber, 2013
+   <clemens.gruber@pqgruber.com>
+
+   Code description:
+    Requests 4 Web pages via the CURL multi interface
+    and checks if the HTTP status code is 200.
+
+   Update: Fixed! The check for !numfds was the problem.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#ifndef WIN32
+#include <unistd.h>
+#endif
+#include <curl/multi.h>
+
+#define MAX_WAIT_MSECS 30*1000 /* Wait max. 30 seconds */
+
+static const char *urls[] = {
+  "http://www.microsoft.com",
+  "http://www.yahoo.com",
+  "http://www.wikipedia.org",
+  "http://slashdot.org"
+};
+#define CNT 4
+
+static size_t cb(char *d, size_t n, size_t l, void *p)
+{
+  /* take care of the data here, ignored in this example */
+  (void)d;
+  (void)p;
+  return n*l;
+}
+
+static void init(CURLM *cm, int i)
+{
+  CURL *eh = curl_easy_init();
+  curl_easy_setopt(eh, CURLOPT_WRITEFUNCTION, cb);
+  curl_easy_setopt(eh, CURLOPT_HEADER, 0L);
+  curl_easy_setopt(eh, CURLOPT_URL, urls[i]);
+  curl_easy_setopt(eh, CURLOPT_PRIVATE, urls[i]);
+  curl_easy_setopt(eh, CURLOPT_VERBOSE, 0L);
+  curl_multi_add_handle(cm, eh);
+}
+
+int main(void)
+{
+    CURLM *cm=NULL;
+    CURL *eh=NULL;
+    CURLMsg *msg=NULL;
+    CURLcode return_code=0;
+    int still_running=0, i=0, msgs_left=0;
+    int http_status_code;
+    const char *szUrl;
+
+    curl_global_init(CURL_GLOBAL_ALL);
+
+    cm = curl_multi_init();
+
+    for (i = 0; i < CNT; ++i) {
+        init(cm, i);
+    }
+
+    curl_multi_perform(cm, &still_running);
+
+    do {
+        int numfds=0;
+        int res = curl_multi_wait(cm, NULL, 0, MAX_WAIT_MSECS, &numfds);
+        if(res != CURLM_OK) {
+            fprintf(stderr, "error: curl_multi_wait() returned %d\n", res);
+            return EXIT_FAILURE;
+        }
+        /*
+         if(!numfds) {
+            fprintf(stderr, "error: curl_multi_wait() numfds=%d\n", numfds);
+            return EXIT_FAILURE;
+         }
+        */
+        curl_multi_perform(cm, &still_running);
+
+    } while(still_running);
+
+    while ((msg = curl_multi_info_read(cm, &msgs_left))) {
+        if (msg->msg == CURLMSG_DONE) {
+            eh = msg->easy_handle;
+
+            return_code = msg->data.result;
+            if(return_code!=CURLE_OK) {
+                fprintf(stderr, "CURL error code: %d\n", msg->data.result);
+                continue;
+            }
+
+            // Get HTTP status code
+            http_status_code=0;
+            szUrl = NULL;
+
+            curl_easy_getinfo(eh, CURLINFO_RESPONSE_CODE, &http_status_code);
+            curl_easy_getinfo(eh, CURLINFO_PRIVATE, &szUrl);
+
+            if(http_status_code==200) {
+                printf("200 OK for %s\n", szUrl);
+            } else {
+                fprintf(stderr, "GET of %s returned http status code %d\n", szUrl, http_status_code);
+            }
+
+            curl_multi_remove_handle(cm, eh);
+            curl_easy_cleanup(eh);
+        }
+        else {
+            fprintf(stderr, "error: after curl_multi_info_read(), CURLMsg=%d\n", msg->msg);
+        }
+    }
+
+    curl_multi_cleanup(cm);
+
+    return EXIT_SUCCESS;
+}