/* Code to mangle pathnames into those matching a given prefix. eg. open("/lib/foo.so") => open("/usr/gnemul/i386-linux/lib/foo.so"); The assumption is that this area does not change. */ #include "qemu/osdep.h" #include <sys/param.h> #include <dirent.h> #include "qemu/cutils.h" #include "qemu/path.h" #include "qemu/thread.h" static const char *base; static GHashTable *hash; static QemuMutex lock; void init_paths(const char *prefix) { if (prefix[0] == '\0' || !strcmp(prefix, "/")) { return; } if (prefix[0] == '/') { base = g_strdup(prefix); } else { char *cwd = g_get_current_dir(); base = g_build_filename(cwd, prefix, NULL); g_free(cwd); } hash = g_hash_table_new(g_str_hash, g_str_equal); qemu_mutex_init(&lock); } /* Look for path in emulation dir, otherwise return name. */ const char *path(const char *name) { gpointer key, value; const char *ret; /* Only do absolute paths: quick and dirty, but should mostly be OK. */ if (!base || !name || name[0] != '/') { return name; } qemu_mutex_lock(&lock); /* Have we looked up this file before? */ if (g_hash_table_lookup_extended(hash, name, &key, &value)) { ret = value ? value : name; } else { char *save = g_strdup(name); char *full = g_build_filename(base, name, NULL); /* Look for the path; record the result, pass or fail. */ if (access(full, F_OK) == 0) { /* Exists. */ g_hash_table_insert(hash, save, full); ret = full; } else { /* Does not exist. */ g_free(full); g_hash_table_insert(hash, save, NULL); ret = name; } } qemu_mutex_unlock(&lock); return ret; }