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