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glibc/nptl/tst-context1.c
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/* Copyright (C) 2003-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <error.h> | |
#include <limits.h> | |
#include <pthread.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <ucontext.h> | |
#define N 4 | |
#if __WORDSIZE == 64 | |
#define GUARD_PATTERN 0xdeadbeafdeadbeaf | |
#else | |
#define GUARD_PATTERN 0xdeadbeaf | |
#endif | |
typedef struct { | |
ucontext_t uctx; | |
unsigned long guard[3]; | |
} tst_context_t; | |
static char stacks[N][2 * PTHREAD_STACK_MIN]; | |
static tst_context_t ctx[N][2]; | |
static volatile int failures; | |
static void | |
fct (long int n) | |
{ | |
char on_stack[1]; | |
/* Just to use the thread local descriptor. */ | |
printf ("%ld: in %s now, on_stack = %p\n", n, __FUNCTION__, on_stack); | |
errno = 0; | |
if (ctx[n][1].uctx.uc_link != &ctx[n][0].uctx) | |
{ | |
printf ("context[%ld][1] uc_link damaged, = %p\n", n, | |
ctx[n][1].uctx.uc_link); | |
exit (1); | |
} | |
if ((ctx[n][0].guard[0] != GUARD_PATTERN) | |
|| (ctx[n][0].guard[1] != GUARD_PATTERN) | |
|| (ctx[n][0].guard[2] != GUARD_PATTERN)) | |
{ | |
printf ("%ld: %s context[0] overflow detected!\n", n, __FUNCTION__); | |
++failures; | |
} | |
if ((ctx[n][1].guard[0] != GUARD_PATTERN) | |
|| (ctx[n][1].guard[1] != GUARD_PATTERN) | |
|| (ctx[n][1].guard[2] != GUARD_PATTERN)) | |
{ | |
printf ("%ld: %s context[1] overflow detected!\n", n, __FUNCTION__); | |
++failures; | |
} | |
if (n < 0 || n >= N) | |
{ | |
printf ("%ld out of range\n", n); | |
exit (1); | |
} | |
if (on_stack < stacks[n] || on_stack >= stacks[n] + sizeof (stacks[0])) | |
{ | |
printf ("%ld: on_stack not on appropriate stack\n", n); | |
exit (1); | |
} | |
} | |
static void * | |
tf (void *arg) | |
{ | |
int n = (int) (long int) arg; | |
ctx[n][0].guard[0] = GUARD_PATTERN; | |
ctx[n][0].guard[1] = GUARD_PATTERN; | |
ctx[n][0].guard[2] = GUARD_PATTERN; | |
ctx[n][1].guard[0] = GUARD_PATTERN; | |
ctx[n][1].guard[1] = GUARD_PATTERN; | |
ctx[n][1].guard[2] = GUARD_PATTERN; | |
if (getcontext (&ctx[n][1].uctx) != 0) | |
{ | |
printf ("%d: cannot get context: %m\n", n); | |
exit (1); | |
} | |
printf ("%d: %s: before makecontext\n", n, __FUNCTION__); | |
ctx[n][1].uctx.uc_stack.ss_sp = stacks[n]; | |
ctx[n][1].uctx.uc_stack.ss_size = sizeof (stacks[n]); | |
ctx[n][1].uctx.uc_link = &ctx[n][0].uctx; | |
makecontext (&ctx[n][1].uctx, (void (*) (void)) fct, 1, (long int) n); | |
printf ("%d: %s: before swapcontext\n", n, __FUNCTION__); | |
if (swapcontext (&ctx[n][0].uctx, &ctx[n][1].uctx) != 0) | |
{ | |
++failures; | |
printf ("%d: %s: swapcontext failed\n", n, __FUNCTION__); | |
} | |
else | |
printf ("%d: back in %s\n", n, __FUNCTION__); | |
return NULL; | |
} | |
static volatile int global; | |
static int | |
do_test (void) | |
{ | |
int n; | |
pthread_t th[N]; | |
ucontext_t mctx; | |
puts ("making contexts"); | |
if (getcontext (&mctx) != 0) | |
{ | |
if (errno == ENOSYS) | |
{ | |
puts ("context handling not supported"); | |
exit (0); | |
} | |
printf ("%s: getcontext: %m\n", __FUNCTION__); | |
exit (1); | |
} | |
/* Play some tricks with this context. */ | |
if (++global == 1) | |
if (setcontext (&mctx) != 0) | |
{ | |
puts ("setcontext failed"); | |
exit (1); | |
} | |
if (global != 2) | |
{ | |
puts ("global not incremented twice"); | |
exit (1); | |
} | |
puts ("global OK"); | |
pthread_attr_t at; | |
if (pthread_attr_init (&at) != 0) | |
{ | |
puts ("attr_init failed"); | |
return 1; | |
} | |
if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0) | |
{ | |
puts ("attr_setstacksize failed"); | |
return 1; | |
} | |
for (n = 0; n < N; ++n) | |
if (pthread_create (&th[n], &at, tf, (void *) (long int) n) != 0) | |
{ | |
puts ("create failed"); | |
exit (1); | |
} | |
if (pthread_attr_destroy (&at) != 0) | |
{ | |
puts ("attr_destroy failed"); | |
return 1; | |
} | |
for (n = 0; n < N; ++n) | |
if (pthread_join (th[n], NULL) != 0) | |
{ | |
puts ("join failed"); | |
exit (1); | |
} | |
return failures; | |
} | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" |