This is an automated email from the ASF dual-hosted git repository.
xiaoxiang781216 pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/nuttx-apps.git
The following commit(s) were added to refs/heads/master by this push:
new d3de432a2 examples/sotest: Check that a library can be opened twice.
d3de432a2 is described below
commit d3de432a2c269a581c9c71d81760417c8401da67
Author: Marco Casaroli <[email protected]>
AuthorDate: Mon Aug 3 12:26:13 2026 +0200
examples/sotest: Check that a library can be opened twice.
dlopen() of an already loaded library used to fail, so nothing exercised
what happens when two callers hold the same object.
Open the library a second time, check the same handle comes back, close
one of the two and check the library is still usable through the other.
Needs the counterpart change in nuttx; without it the second dlopen()
returns NULL and this reports it.
Assisted-by: Claude Opus 5 (1M context) <[email protected]>
Signed-off-by: Marco Casaroli <[email protected]>
---
examples/sotest/main/sotest_main.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/examples/sotest/main/sotest_main.c
b/examples/sotest/main/sotest_main.c
index 6b2417ddb..94b7eab81 100644
--- a/examples/sotest/main/sotest_main.c
+++ b/examples/sotest/main/sotest_main.c
@@ -130,6 +130,7 @@ int main(int argc, FAR char *argv[])
FAR void *handle1;
#endif
FAR void *handle2;
+ FAR void *handle3;
CODE void (*testfunc)(FAR const char *msg);
FAR const char *msg;
int ret;
@@ -326,6 +327,42 @@ int main(int argc, FAR char *argv[])
testfunc(msg);
+ /* Open the same library again. dlopen() must return the object that is
+ * already loaded, and closing one of the two handles must leave the
+ * other usable.
+ */
+
+ handle3 = dlopen(sotest_path, RTLD_NOW | RTLD_LOCAL);
+ if (handle3 == NULL)
+ {
+ fprintf(stderr, "ERROR: dlopen(%s) failed on an already loaded "
+ "library\n", sotest_path);
+ exit(EXIT_FAILURE);
+ }
+
+ if (handle3 != handle2)
+ {
+ fprintf(stderr, "ERROR: dlopen() returned %p for a library already "
+ "loaded at %p\n", handle3, handle2);
+ exit(EXIT_FAILURE);
+ }
+
+ ret = dlclose(handle3);
+ if (ret != 0)
+ {
+ fprintf(stderr, "ERROR: dlclose(handle3) failed: %d\n", ret);
+ exit(EXIT_FAILURE);
+ }
+
+ testfunc = (CODE void (*)(FAR const char *))dlsym(handle2, "testfunc1");
+ if (testfunc == NULL)
+ {
+ fprintf(stderr, "ERROR: closing one handle unloaded the library\n");
+ exit(EXIT_FAILURE);
+ }
+
+ testfunc(msg);
+
#if CONFIG_LIBC_ELF_MAXDEPEND > 0
/* This should fail because the second shared library depends on
* the first.
