问题描述
我发现以下代码可使用libboost获取本地IP地址。我正在使用libboost-1.65。
I found the following code to get the local IP addresses using libboost. I am using libboost-1.65.
#include <iostream>
#include <boost/asio.hpp>
std::string getHostIP ()
{
using boost::asio::ip::tcp;
boost::asio::io_service io_service;
tcp::resolver resolver(io_service);
std::cout << boost::asio::ip::host_name() << std::endl;
tcp::resolver::query query(boost::asio::ip::host_name(), "");
tcp::resolver::iterator iter = resolver.resolve(query);
tcp::resolver::iterator end; // End marker.
while (iter != end)
{
tcp::endpoint ep = *iter++;
std::cout << ep << std::endl;
}
}
int main() {
getHostIP();
}
我目前的输出为
daniel-XVirtualBox
127.0.1.1:0
free(): invalid size
Aborted (core dumped)
主机名正确，而本地主机的IP地址。我知道计算机上有多个接口，该查询可以返回任意数量的接口，但是我看不到连接到计算机的其他两个接口。我还将添加 ifconfig 的输出。
The hostname is correct, and the IP address of the localhost. I know that there are multiple interfaces on the computer and that query can return any number of them, but I do not see the two other interfaces connected to the computer. I will add the output of ifconfig also.
但是，我的问题与 free（）：无效大小位有关。
GDB补充说：
However, my question is concerning the "free(): invalid size" bit.GDB says this in addition:
Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
***Backtrace***
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1 0x00007ffff705a801 in __GI_abort () at abort.c:79
#2 0x00007ffff70a3897 in __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7ffff71d0b9a "%s\n")
at ../sysdeps/posix/libc_fatal.c:181
#3 0x00007ffff70aa90a in malloc_printerr (str=str@entry=0x7ffff71ceda0 "free(): invalid size") at malloc.c:5350
#4 0x00007ffff70b1e2c in _int_free (have_lock=0, p=0x7ffff7de5990 <_dl_init+864>, av=0x7ffff7405c40 <main_arena>)
at malloc.c:4161
#5 __GI___libc_free (mem=0x7ffff7de59a0 <_dl_fini>) at malloc.c:3124
#6 0x0000555555559111 in main () at boost_gethostname.cpp:22
我是否缺少用于boost :: asio :: io_service的清理程序？解析器应该停止吗？而且，为什么我看不到计算机上的所有接口？
Is there a clean-up procedure for boost::asio::io_service that I am missing? Should the resolver be stopped? And also, why do I not see all the interfaces on the computer?
谢谢！
ifconfig:
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.2.15 netmask 255.255.255.0 broadcast 10.0.2.255
inet6 fe80::ecd6:f288:3b03:d8cf prefixlen 64 scopeid 0x20<link>
ether 08:00:27:37:63:98 txqueuelen 1000 (Ethernet)
RX packets 114124 bytes 111705475 (111.7 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 42644 bytes 3732986 (3.7 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp0s8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.10.11.221 netmask 255.255.255.0 broadcast 10.10.11.255
inet6 fe80::3aa2:ecbd:5702:2ab4 prefixlen 64 scopeid 0x20<link>
ether 08:00:27:a6:44:ce txqueuelen 1000 (Ethernet)
RX packets 194194 bytes 24826176 (24.8 MB)
RX errors 0 dropped 7354 overruns 0 frame 0
TX packets 1189 bytes 127853 (127.8 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 912 bytes 76283 (76.2 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 912 bytes 76283 (76.2 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
推荐答案
您已触发了令人讨厌的未定义行为（UD），最终导致程序中出现 SIGABRT 。在：
You have triggered a nasty case of undefined behavior (UD), which ultimately lead to a SIGABRT in your program. In 9.6.3 [stmt.return]:
从技术上讲，大约
现在您将看到为什么这可能是非常坏事。如果将返回类型设置为 void 而不是 std :: string ，或者您执行返回一些字符串，程序不再崩溃。
Now here you see why this can be a very bad thing. If you set the return type to void instead of std::string or if you do return some string, the program doesn't crash anymore.
虽然gcc生成的代码似乎会产生或（取决于版本），使用clang生成的代码将发布。如果更改返回类型，两个编译器都可以正常工作。更令人困惑的是，使用gcc 4.9.x;在这里，尽管有UB，您的代码。
While gcc-generated code seems to produce a segfault or an abort (depending on the version), clang-generated code will issue an illegal instruction. Both compilers do fine if you change the return type. For even more confusion, take gcc 4.9.x; here your code just works fine, despite UB.
这段代码是未定义行为的真实表现，它确实会弄乱您的应用程序。
This piece of code is a true sweetie pie of undefined behavior that can really mess up your application.
这篇关于Libboost ::解析器收到了SIGABRT的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！