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authorCarlos O'Donell <carlos@systemhalted.org>2015-01-21 01:51:10 -0500
committerCarlos O'Donell <carlos@systemhalted.org>2015-01-21 01:51:10 -0500
commitccdb048df457d581f6ac7ede8b0c7a593a891dfa (patch)
tree9f87447c45093fb2ded95c982e68c9e6e886129c /dlfcn/moddummy2.c
parent042e1521c794a945edc43b5bfa7e69ad70420524 (diff)
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Fix recursive dlopen.
The ability to recursively call dlopen is useful for malloc implementations that wish to load other dynamic modules that implement reentrant/AS-safe functions to use in their own implementation. Given that a user malloc implementation may be called by an ongoing dlopen to allocate memory the user malloc implementation interrupts dlopen and if it calls dlopen again that's a reentrant call. This patch fixes the issues with the ld.so.cache mapping and the _r_debug assertion which prevent this from working as expected. See: https://sourceware.org/ml/libc-alpha/2014-12/msg00446.html
Diffstat (limited to 'dlfcn/moddummy2.c')
-rw-r--r--dlfcn/moddummy2.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/dlfcn/moddummy2.c b/dlfcn/moddummy2.c
new file mode 100644
index 0000000000..cb4edc8da7
--- /dev/null
+++ b/dlfcn/moddummy2.c
@@ -0,0 +1,13 @@
+/* Provide a dummy DSO for tst-rec-dlopen to use. */
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+dummy2 (void)
+{
+ printf ("Called dummy2()\n");
+ /* If the outer dlopen is not dummy1 (becuase of some error)
+ then tst-rec-dlopen will see a value of -1 as the returned
+ result and fail. */
+ return -1;
+}