count requests

server.c

@@ -2,14 +2,67 @@
 #include <netinet/in.h>
 #include <stdbool.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <strings.h>
 #include <sys/socket.h>
 #include <unistd.h>
+#include <time.h>
 
 #define PORT 6008
 #define BACKLOG 16
 #define RECV_BUF 256
+#define DATE_BUF 11
+
+static char current_day[DATE_BUF];
+static unsigned long daily_requests;
+static bool stats_initialized;
+static const char *stats_file = "request_counts.txt";
+
+static void write_day_count(const char *day, unsigned long count)
+{
+    FILE *f = fopen(stats_file, "a");
+    if (!f)
+        return;
+    fprintf(f, "%s %lu\n", day, count);
+    fclose(f);
+}
+
+static void flush_request_stats(void)
+{
+    if (!stats_initialized || daily_requests == 0)
+        return;
+    write_day_count(current_day, daily_requests);
+}
+
+static void record_request(void)
+{
+    time_t now = time(NULL);
+    struct tm tm_now;
+    if (localtime_r(&now, &tm_now) == NULL)
+        return;
+
+    char today[DATE_BUF];
+    if (strftime(today, sizeof(today), "%Y-%m-%d", &tm_now) == 0)
+        return;
+
+    if (!stats_initialized)
+    {
+        strncpy(current_day, today, sizeof(current_day));
+        current_day[DATE_BUF - 1] = '\0';
+        daily_requests = 0;
+        stats_initialized = true;
+    }
+    if (strcmp(today, current_day) != 0)
+    {
+        flush_request_stats();
+        strncpy(current_day, today, sizeof(current_day));
+        current_day[DATE_BUF - 1] = '\0';
+        daily_requests = 0;
+    }
+
+    daily_requests++;
+}
 
 int main()
 {
@@ -27,6 +80,8 @@ int main()
 
     printf("listening port %d\nbacklog %d\nrecv buffer %d\n", PORT, BACKLOG, RECV_BUF);
 
+    atexit(flush_request_stats);
+
     char buf[RECV_BUF];
     const char *hdr = "X-Forwarded-For:";
     const size_t hdrlen = strlen(hdr);
@@ -43,6 +98,7 @@ int main()
             continue;
         }
         buf[r] = 0;
+    record_request();
         // detect optional JSON response request on the first line
         bool wants_json = false;
         const char *line_end = strstr(buf, "\r\n");