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/*
* A process that madly dlopen()s and dlclose()s shared libraries in a number of
* threads: some of them are in secondary namespaces.
*
* It also exec()s itself once.
*/
/*
* Oracle Linux DTrace.
* Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
* Licensed under the Universal Permissive License v 1.0 as shown at
* http://oss.oracle.com/licenses/upl.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <dlfcn.h>
#include <pthread.h>
static int load_count;
static int unload_count;
static long looptime = 10;
static int many_lmids;
static void *churn(void *unused)
{
struct timeval start, now;
Lmid_t lmids[6] = {0};
void *loaded[6] = {0};
void *non_dlm = NULL;
char *error;
gettimeofday(&start, NULL);
/*
* Populate the dlmopen set.
*
* I'd like to continuously open and close these, but that is
* impossible: this causes a massive TLS space leak and failure to
* dlopen() after only a dozen or so opens. So for now, dlmopen()
* a few times, then switch to a dlopen()/dlclose() alternation.
*
* I'd rather use __atomic_add_fetch() here, but it's not supported in
* GCC 4.4.
*/
while (gettimeofday(&now, NULL),
now.tv_sec < start.tv_sec + looptime) {
int n = rand() % 6;
if (lmids[n] == 0)
lmids[n] = LM_ID_NEWLM;
if (non_dlm != NULL) {
dlerror();
dlclose(non_dlm);
if ((error = dlerror()) != NULL)
fprintf(stderr, "Error closing library: %s\n",
error);
__sync_add_and_fetch(&unload_count, 1);
}
dlerror();
if (many_lmids && loaded[n] == NULL) {
loaded[n] = dlmopen(lmids[n], "test/triggers/libproc-dlmlib.so.0", RTLD_NOW);
fprintf(stderr, "opened in lmid %i: %p\n", n, loaded[n]);
}
else
non_dlm = dlopen("test/triggers/libproc-dlmlib.so.0", RTLD_NOW);
if ((error = dlerror()) != NULL)
fprintf(stderr, "Error opening library: %s\n",
error);
__sync_add_and_fetch(&load_count, 1);
}
return NULL;
}
int main (int argc, char *argv[])
{
int num_threads = (getenv("NUM_THREADS") != NULL) ?
strtol(getenv("NUM_THREADS"), NULL, 10) : 1;
pthread_t children[num_threads];
many_lmids = (getenv("MANY_LMIDS") != NULL);
if (argc == 2)
looptime = strtol(argv[1], NULL, 10);
srand(time(NULL));
if (num_threads > 1) {
size_t i;
for (i = 0; i < num_threads; i++)
if (pthread_create(&children[i], NULL, churn,
NULL) < 0) {
perror("creating thread");
exit(1);
}
for (i = 0; i < num_threads; i++)
pthread_join(children[i], NULL);
} else
churn(NULL);
printf("%i loads, %i unloads\n", load_count, unload_count);
if (argc == 1) {
char buf[32];
fprintf(stderr, "Execing...\n");
snprintf(buf, sizeof(buf), "%li", looptime);
execl(argv[0], argv[0], buf, NULL);
}
return 0;
}
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