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glibc/stdlib/tst-makecontext.c
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/* Copyright (C) 2006-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
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 <stdlib.h> | |
#include <stdio.h> | |
#include <ucontext.h> | |
#include <assert.h> | |
#include <unwind.h> | |
#include <dlfcn.h> | |
#include <gnu/lib-names.h> | |
ucontext_t ucp; | |
char st1[16384]; | |
__thread int thr; | |
int somevar = -76; | |
long othervar = -78L; | |
struct trace_arg | |
{ | |
int cnt, size; | |
}; | |
static _Unwind_Reason_Code | |
backtrace_helper (struct _Unwind_Context *ctx, void *a) | |
{ | |
struct trace_arg *arg = a; | |
if (++arg->cnt == arg->size) | |
return _URC_END_OF_STACK; | |
return _URC_NO_REASON; | |
} | |
void | |
cf (int i) | |
{ | |
struct trace_arg arg = { .size = 100, .cnt = -1 }; | |
void *handle; | |
_Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *); | |
if (i != othervar || thr != 94) | |
{ | |
printf ("i %d thr %d\n", i, thr); | |
exit (1); | |
} | |
/* Test if callback function of _Unwind_Backtrace is not called infinitely | |
times. See Bug 18508 or gcc bug "Bug 66303 - runtime.Caller() returns | |
infinitely deep stack frames on s390x.". | |
The go runtime calls backtrace_full() in | |
<gcc-src>/libbacktrace/backtrace.c, which uses _Unwind_Backtrace(). */ | |
handle = dlopen (LIBGCC_S_SO, RTLD_LAZY); | |
if (handle != NULL) | |
{ | |
unwind_backtrace = dlsym (handle, "_Unwind_Backtrace"); | |
if (unwind_backtrace != NULL) | |
{ | |
unwind_backtrace (backtrace_helper, &arg); | |
assert (arg.cnt != -1 && arg.cnt < 100); | |
} | |
dlclose (handle); | |
} | |
/* Since uc_link below has been set to NULL, setcontext is supposed to | |
terminate the process normally after this function returns. */ | |
} | |
int | |
do_test (void) | |
{ | |
if (getcontext (&ucp) != 0) | |
{ | |
if (errno == ENOSYS) | |
{ | |
puts ("context handling not supported"); | |
return 0; | |
} | |
puts ("getcontext failed"); | |
return 1; | |
} | |
thr = 94; | |
ucp.uc_link = NULL; | |
ucp.uc_stack.ss_sp = st1; | |
ucp.uc_stack.ss_size = sizeof st1; | |
makecontext (&ucp, (void (*) (void)) cf, 1, somevar - 2); | |
if (setcontext (&ucp) != 0) | |
{ | |
puts ("setcontext failed"); | |
return 1; | |
} | |
return 2; | |
} | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" |