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#include <errno.h>
#include <limits.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/resource.h>
static void use_stack (size_t needed);
void (*use_stack_ptr) (size_t) = use_stack;
static void
use_stack (size_t needed)
{
size_t sz = sysconf (_SC_PAGESIZE);
char *buf = alloca (sz);
memset (buf, '\0', sz);
if (needed > sz)
use_stack_ptr (needed - sz);
}
static void
use_up_memory (void)
{
struct rlimit rl;
getrlimit (RLIMIT_AS, &rl);
rl.rlim_cur = 10 * 1024 * 1024;
setrlimit (RLIMIT_AS, &rl);
char *c;
int PAGESIZE = getpagesize ();
while (1)
{
c = mmap (NULL, PAGESIZE, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
if (c == MAP_FAILED)
break;
}
}
static void *
child (void *arg)
{
sleep (1);
return arg;
}
static int
do_test (void)
{
int err;
pthread_t tid;
/* Allocate the memory needed for the stack. */
#ifdef PTHREAD_STACK_MIN
use_stack_ptr (PTHREAD_STACK_MIN);
#else
use_stack_ptr (4 * getpagesize ());
#endif
use_up_memory ();
err = pthread_create (&tid, NULL, child, NULL);
if (err != 0)
{
printf ("pthread_create returns %d: %s\n", err,
err == EAGAIN ? "OK" : "FAIL");
return err != EAGAIN;
}
/* We did not fail to allocate memory despite the preparation. Oh well. */
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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