X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fldso%2Fdynlink.c;h=b1a4409dc17c1066e6774d7e045e7b2c5d576b06;hp=4ce1c3e88b8451d0f8adf509cd46420c464e25ce;hb=4d07e5521ea811278f00f434fe2b8345ea1d8832;hpb=cdc5c74c6abdb47453f2f7a170ed88b88698dee7

diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index 4ce1c3e8..b1a4409d 100644
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -99,6 +99,7 @@ static int ssp_used;
 static int runtime;
 static int ldd_mode;
 static int ldso_fail;
+static int noload;
 static jmp_buf rtld_fail;
 static pthread_rwlock_t lock;
 static struct debug debug;
@@ -508,7 +509,7 @@ static struct dso *load_library(const char *name)
 			return p;
 		}
 	}
-	map = map_library(fd, &temp_dso);
+	map = noload ? 0 : map_library(fd, &temp_dso);
 	close(fd);
 	if (!map) return 0;
 
@@ -1027,6 +1028,7 @@ void *dlopen(const char *file, int mode)
 	orig_tls_offset = tls_offset;
 	orig_tls_align = tls_align;
 	orig_tail = tail;
+	noload = mode & RTLD_NOLOAD;
 
 	if (setjmp(rtld_fail)) {
 		/* Clean up anything new that was (partially) loaded */
@@ -1050,8 +1052,10 @@ void *dlopen(const char *file, int mode)
 	} else p = load_library(file);
 
 	if (!p) {
-		snprintf(errbuf, sizeof errbuf,
-			"Error loading shared library %s: %m", file);
+		snprintf(errbuf, sizeof errbuf, noload ?
+			"Library %s is not already loaded" :
+			"Error loading shared library %s: %m",
+			file);
 		errflag = 1;
 		goto end;
 	}
@@ -1091,7 +1095,7 @@ end:
 	return p;
 }
 
-static int invalid_dso_handle(struct dso *h)
+static int invalid_dso_handle(void *h)
 {
 	struct dso *p;
 	for (p=head; p; p=p->next) if (h==p) return 0;
@@ -1119,7 +1123,8 @@ static void *do_dlsym(struct dso *p, const char *s, void *ra)
 			return __tls_get_addr((size_t []){def.dso->tls_id, def.sym->st_value});
 		return def.dso->base + def.sym->st_value;
 	}
-	if (invalid_dso_handle(p)) return 0;
+	if (p != RTLD_DEFAULT && p != RTLD_NEXT && invalid_dso_handle(p))
+		return 0;
 	if (p->ghashtab) {
 		gh = gnu_hash(s);
 		sym = gnu_lookup(s, gh, p);
@@ -1246,7 +1251,7 @@ int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void
 	return ret;
 }
 #else
-static int invalid_dso_handle(struct dso *h)
+static int invalid_dso_handle(void *h)
 {
 	snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h);
 	errflag = 1;