github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/syscalls/linux/sigaltstack_check.cc (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // Checks that there is no alternate signal stack by default.
    16  //
    17  // Used by a test in sigaltstack.cc.
    18  #include <errno.h>
    19  #include <signal.h>
    20  #include <stdio.h>
    21  #include <string.h>
    22  #include <unistd.h>
    23  
    24  #include "test/util/logging.h"
    25  
    26  int main(int /* argc */, char** /* argv */) {
    27    stack_t stack;
    28    TEST_CHECK(sigaltstack(nullptr, &stack) >= 0);
    29    TEST_CHECK(stack.ss_flags == SS_DISABLE);
    30    TEST_CHECK(stack.ss_sp == 0);
    31    TEST_CHECK(stack.ss_size == 0);
    32    return 0;
    33  }