index: mmap: open and close file
diff --git a/libkmod/libkmod-index.c b/libkmod/libkmod-index.c
index a0f9e0b..c078524 100644
--- a/libkmod/libkmod-index.c
+++ b/libkmod/libkmod-index.c
@@ -506,3 +506,91 @@
buf_destroy(buf);
return out;
}
+
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+/**************************************************************************/
+/*
+ * Alternative implementation, using mmap to map all the file to memory when
+ * starting
+ */
+struct index_mm {
+ struct kmod_ctx *ctx;
+ void *mm;
+ uint32_t root_offset;
+ size_t size;
+};
+
+struct index_mm *index_mm_open(struct kmod_ctx *ctx, const char *filename)
+{
+ int fd;
+ struct stat st;
+ struct index_mm *idx;
+ struct {
+ uint32_t magic;
+ uint32_t version;
+ uint32_t root_offset;
+ } hdr;
+ void *p;
+
+ DBG(ctx, "file=%s\n", filename);
+
+ if ((fd = open(filename, O_RDONLY)) < 0) {
+ ERR(ctx, "%m\n");
+ return NULL;
+ }
+
+ fstat(fd, &st);
+
+ idx = malloc(sizeof(*idx));
+ if (idx == NULL) {
+ ERR(ctx, "%m\n");
+ goto fail;
+ }
+
+ if ((idx->mm = mmap(0, st.st_size, PROT_READ,
+ MAP_PRIVATE | MAP_POPULATE,
+ fd, 0)) == MAP_FAILED) {
+ ERR(ctx, "%m\n");
+ goto fail;
+ }
+
+ p = idx->mm;
+ hdr.magic = read_long_mm(&p);
+ hdr.version = read_long_mm(&p);
+ hdr.root_offset = read_long_mm(&p);
+
+ if (hdr.magic != INDEX_MAGIC) {
+ ERR(ctx, "magic check fail: %x instead of %x\n", hdr.magic,
+ INDEX_MAGIC);
+ goto fail;
+ }
+
+ if (hdr.version >> 16 != INDEX_VERSION_MAJOR) {
+ ERR(ctx, "major version check fail: %u instead of %u\n",
+ hdr.version, INDEX_MAGIC);
+ goto fail;
+ }
+
+ idx->root_offset = hdr.root_offset;
+ idx->size = st.st_size;
+ idx->ctx = ctx;
+ close(fd);
+
+ return idx;
+
+fail:
+ close(fd);
+ if (idx->mm)
+ munmap(idx->mm, st.st_size);
+ free(idx);
+ return NULL;
+}
+
+void index_mm_close(struct index_mm *idx)
+{
+ munmap(idx->mm, idx->size);
+ free(idx);
+}