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examples/sotest: Check that a library can be opened twice #3691

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Merged
xiaoxiang781216 merged 1 commit into from
Aug 4, 2026
+37 −0
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examples/sotest: Check that a library can be opened twice #3691

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37 changes: 37 additions & 0 deletions examples/sotest/main/sotest_main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -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.
Expand Down
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