diff options
Diffstat (limited to 'REORG.TODO/stdlib/tst-makecontext.c')
| -rw-r--r-- | REORG.TODO/stdlib/tst-makecontext.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/REORG.TODO/stdlib/tst-makecontext.c b/REORG.TODO/stdlib/tst-makecontext.c new file mode 100644 index 0000000000..d7ffad5f64 --- /dev/null +++ b/REORG.TODO/stdlib/tst-makecontext.c @@ -0,0 +1,110 @@ +/* Copyright (C) 2006-2017 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" |