我正在用 libuv 为 C++ 中的流编写一个包装器,但它有段错误,我不知道为什么。流类:
class Stream{
public:
Stream(int fd);
void Write(const std::string& data, const std::function<void(void)>& callback);
const static int STDIN = 0;
const static int STDOUT = 1;
private:
static void OnWrite(uv_write_t *req, int status);
uv_pipe_t pipe;
};
以及实施
Stream::Stream(int fd){
uv_pipe_init(uv_default_loop(), &pipe, 0);
uv_pipe_open(&pipe, fd);
}
void Stream::Write(const std::string& data, const std::function<void(void)>& callback){
uv_write_t request;
uv_buf_t buffer = uv_buf_init((char*)malloc(data.length()*sizeof(char)), data.length());
strcpy(buffer.base, data.c_str());
buffer.len = data.length();
uv_write(&request, (uv_stream_t*)&pipe, &buffer, 1, OnWrite);
}
void Stream::OnWrite(uv_write_t *req, int status){
}
在主文件中,我这样做:
Stream* out = new Stream(Stream::STDOUT);
out->Write("Hello, World!", []() {
});
uv_run(uv_default_loop(), RUN_DEFAULT);
但是,一旦我运行它,它就会在uv_run
语句中出现段错误。回溯:
#0 0x00007ffff7bcac94 in uv__write_callbacks (stream=stream@entry=0x603010) at src/unix/stream.c:907
#1 0x00007ffff7bcb0a1 in uv__stream_io (loop=<optimized out>, w=0x603098, events=<optimized out>) at src/unix/stream.c:1243
#2 0x00007ffff7bc31eb in uv__run_pending (loop=0x7ffff7dd98c0 <default_loop_struct>) at src/unix/core.c:710
#3 uv_run (loop=0x7ffff7dd98c0 <default_loop_struct>, mode=UV_RUN_DEFAULT) at src/unix/core.c:316
#4 0x0000000000400fcd in main ()
但是,如果我将 uv_run 放入Stream::Write
方法中,它就可以正常工作。我怎样才能解决这个问题?
编辑
我现在在堆上而不是在堆栈上分配管道,但它仍然给我一个段错误。我uv_pipe_t
将标题更改为uv_pipe_t*
,现在实现更改为:
Stream::Stream(int fd){
pipe = new uv_pipe_t;
uv_pipe_init(uv_default_loop(), pipe, 0);
uv_pipe_open(pipe, fd);
}
void Stream::Write(const std::string& data, const std::function<void(void)>& callback){
uv_write_t request;
uv_buf_t buffer = uv_buf_init((char*)data.c_str(), data.length());
uv_write(&request, (uv_stream_t*)pipe, &buffer, 1, OnWrite);
}
void Stream::OnWrite(uv_write_t *req, int status){
delete req;
}
来自 GDB 的回溯:
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7bcac94 in uv__write_callbacks (stream=stream@entry=0x603030) at src/unix/stream.c:907
907 uv__req_unregister(stream->loop, req);
(gdb) backtrace
#0 0x00007ffff7bcac94 in uv__write_callbacks (stream=stream@entry=0x603030) at src/unix/stream.c:907
#1 0x00007ffff7bcb0a1 in uv__stream_io (loop=<optimized out>, w=0x6030b8, events=<optimized out>) at src/unix/stream.c:1243
#2 0x00007ffff7bc31eb in uv__run_pending (loop=0x7ffff7dd98c0 <default_loop_struct>) at src/unix/core.c:710
#3 uv_run (loop=0x7ffff7dd98c0 <default_loop_struct>, mode=UV_RUN_DEFAULT) at src/unix/core.c:316
#4 0x0000000000400f4d in main ()