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

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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) <noreply@anthropic.com>
Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>
This commit is contained in:
Marco Casaroli 2026-08-03 12:26:13 +02:00 • committed by Xiang Xiao
parent f1033082f9
commit d3de432a2c
1 changed files with 37 additions and 0 deletions
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37
examples/sotest/main/sotest_main.c
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@ -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.