Start implementing a logger

git-svn-id: file:///svn/tokudb@104 c7de825b-a66e-492c-adef-691d508d4ae1

newbrt/log-internal.h

+#define LOGGER_BUF_SIZE (1<<20)
+typedef struct tokulogger *TOKULOGGER;
+struct tokulogger {
+    enum typ_tag tag;
+    char *directory;
+    FILE *f;
+    int next_log_file_number;
+    char buf[LOGGER_BUF_SIZE];
+    int  n_in_buf;
+};

newbrt/log-test.c

+

newbrt/log.c

+#include "log-internal.h"
+#include "yerror.h"
+#include <sys/types.h>
+#include <dirent.h>
+#include <errno.h>
+#include <stdio.h>
+
+int find_next_unused_log_file(const char *directory, long long *result) {
+    DIR *d=opendir(directory);
+    long long max=-1;
+    struct dirent *de;
+    if (d==0) return errno;
+    while ((de=readdir(d))) {
+	if (de==0) return -errno;
+	long long thisl;
+	int r = sscanf(de->d_name, "log%llu.tokulog", &thisl);
+	if (r==1 && thisl>max) max=thisl;
+    }
+    *result=max+1;
+    return 0;
+}
+
+int create_and_open_logger (const char *directory) {
+    TAGMALLOC(TOKULOGGER, result);
+    if (result==0) return -1;
+    int r;
+    long long nexti;
+    r = find_next_unused_log_file(directory, &nexti);
+    if (r!=0) {
+    died0:
+	toku_free(result);
+	return nexti;
+    }
+    result->directory = toku_strdup(directory);
+    if (result->directory!=0) oto died0;
+    result->f = 0;
+    result->next_log_file_number = nexti;
+    result->n_in_buf = 0;
+    return 0;
+}

newbrt/yerror.h

@@ -2,4 +2,5 @@ enum pma_errors { BRT_OK=0, BRT_ALREADY_THERE = -2, BRT_KEYEMPTY=-3 };
 
 enum typ_tag { TYP_BRTNODE = 0xdead0001,
 	       TYP_CACHETABLE, TYP_PAIR, /* for cachetables */
-	       TYP_PMA };
+	       TYP_PMA,
+               TYP_LOGGER };