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author | Carlos O'Donell <carlos@systemhalted.org> | 2015-01-21 01:51:10 -0500 |
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committer | Carlos O'Donell <carlos@systemhalted.org> | 2015-01-21 01:51:10 -0500 |
commit | ccdb048df457d581f6ac7ede8b0c7a593a891dfa (patch) | |
tree | 9f87447c45093fb2ded95c982e68c9e6e886129c /dlfcn/moddummy2.c | |
parent | 042e1521c794a945edc43b5bfa7e69ad70420524 (diff) | |
download | glibc-ccdb048df457d581f6ac7ede8b0c7a593a891dfa.zip glibc-ccdb048df457d581f6ac7ede8b0c7a593a891dfa.tar.gz glibc-ccdb048df457d581f6ac7ede8b0c7a593a891dfa.tar.bz2 |
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.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/dlfcn/moddummy2.c b/dlfcn/moddummy2.c new file mode 100644 index 0000000..cb4edc8 --- /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; +} |