extent mstorage API to include optional persistence

2004-02-04 23:13:37 +00:00
parent 0a16128591
commit dcf0e428f5
8 changed files with 79 additions and 19 deletions
--- a/mstorage_init_persistent.c
+++ b/mstorage_init_persistent.c
@@ -0,0 +1,20 @@
+#define _FILE_OFFSET_BITS 64
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include "mstorage.h"
+
+int mstorage_init_persistent(mstorage_t* p,int fd) {
+  off_t o;
+  p->fd=fd;
+  o=lseek(fd,0,SEEK_END);
+  if (o==-1) return -1;
+  p->mapped=p->used=o;
+  if (p->mapped==0) {
+    p->mapped=4096;
+    if (lseek(fd,4095,SEEK_SET)==-1 || write(fd,"",1)!=1) return -1;
+  }
+  p->root=mmap(0,p->mapped,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
+  if (p->root==(char*)-1) return -1;
+  return 0;
+}