1 files changed, 63 insertions, 0 deletions
diff --git a/mincore.c b/mincore.c
new file mode 100644
index 0000000..3309bd9
--- /dev/null
+++ b/mincore.c
@@ -0,0 +1,63 @@
+#include "compat-util.h"
+
+static void mincore_stats(const char *path)
+{
+        struct stat sb;
+        char *map;
+        unsigned char *vec;
+        size_t vec_len;
+        size_t map_len;
+        int fd;
+        size_t i;
+
+        if ((fd = open(path, O_RDONLY)) < 0) {
+                fprintf(stderr, "%s: open(): %s\n", path, strerror(errno));
+                return;
+        }
+
+        if (fstat(fd, &sb) < 0) {
+                fprintf(stderr, "%s: fstat(%d): %s\n",
+                        path, fd, strerror(errno));
+                goto err_close;
+        }
+
+        vec_len = (sb.st_size + page_size() - 1) / page_size();
+        if (!(vec = malloc(vec_len))) {
+                fprintf(stderr, "%s: malloc(%lu): %s\n",
+                        path, (unsigned long)vec_len, strerror(errno));
+                goto err_close;
+        }
+
+        map_len = PAGE_ALIGN(sb.st_size);
+        if (!(map = mmap(NULL, map_len, PROT_READ, MAP_SHARED, fd, 0))) {
+                fprintf(stderr, "%s: mmap(%lu): %s\n",
+                        path, (unsigned long)vec_len, strerror(errno));
+                goto err_free;
+        }
+
+        if (mincore(map, map_len, vec) < 0) {
+                fprintf(stderr, "%s: mincore(%lu): %s\n",
+                        path, (unsigned long)vec_len, strerror(errno));
+                goto err_munmap;
+        }
+
+        for (i = 0; i < vec_len; ++i)
+                printf("%s: [%08lu] %x\n",
+                       path, (unsigned long)i,
+                       (vec[i]));
+err_munmap:
+        munmap(map, map_len);
+err_free:
+        free(vec);
+err_close:
+        close(fd);
+}
+
+int main(int argc, char * const argv[])
+{
+        int i;
+
+        for (i = 1; i < argc; ++i)
+                mincore_stats(argv[i]);
+        return 0;
+}