Remove unwanted malloc changes, again.
[glibc.git] / nptl / tst-basic7.c
blobff6b36be42b7eb4dd6e436b5736ed81e09730dbe
1 #include <errno.h>
2 #include <pthread.h>
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include <string.h>
6 #include <unistd.h>
7 #include <sys/mman.h>
8 #include <sys/resource.h>
10 static void use_stack (size_t needed);
12 void (*use_stack_ptr) (size_t) = use_stack;
14 static void
15 use_stack (size_t needed)
17 size_t sz = sysconf (_SC_PAGESIZE);
18 char *buf = alloca (sz);
19 memset (buf, '\0', sz);
21 if (needed > sz)
22 use_stack_ptr (needed - sz);
25 static void
26 use_up_memory (void)
28 struct rlimit rl;
29 getrlimit (RLIMIT_AS, &rl);
30 rl.rlim_cur = 10 * 1024 * 1024;
31 setrlimit (RLIMIT_AS, &rl);
33 char *c;
34 int PAGESIZE = getpagesize ();
35 while (1)
37 c = mmap (NULL, PAGESIZE, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
38 if (c == MAP_FAILED)
39 break;
43 static void *
44 child (void *arg)
46 sleep (1);
47 return arg;
50 static int
51 do_test (void)
53 int err;
54 pthread_t tid;
56 /* Allocate the memory needed for the stack. */
57 use_stack_ptr (PTHREAD_STACK_MIN);
59 use_up_memory ();
61 err = pthread_create (&tid, NULL, child, NULL);
62 if (err != 0)
64 printf ("pthread_create returns %d: %s\n", err,
65 err == EAGAIN ? "OK" : "FAIL");
66 return err != EAGAIN;
69 /* We did not fail to allocate memory despite the preparation. Oh well. */
70 return 0;
73 #define TEST_FUNCTION do_test ()
74 #include "../test-skeleton.c"