我一直在使用Valgrind来查找代码中的内存泄漏问题,尽管没有发现任何内存泄漏,但是一些错误报告都源自于单个函数/类方法:
==17043== ERROR SUMMARY: 10100 errors from 3 contexts (suppressed: 0 from 0)
==17043==
==17043== 100 errors in context 1 of 3:
==17043== Syscall param socketcall.sendto(msg) points to uninitialised byte(s)
==17043== at 0x5441DA2: send (send.c:28)
==17043== by 0x404C2D: unix_socket::sendMsg(char, double) (in /home/joao/CloudPT/Bolsa/Webots/controllers/darwin-pi2/client)
==17043== by 0x404F1C: unix_socket::sendVectorXd(Eigen::Matrix<double, -1, 1, 0, -1, 1> const&) (in /home/joao/CloudPT/Bolsa/Webots/controllers/darwin-pi2/client)
==17043== by 0x401F2A: main (in /home/joao/CloudPT/Bolsa/Webots/controllers/darwin-pi2/client)
==17043== Address 0x7feffff61 is on thread 1's stack
==17043== Uninitialised value was created by a stack allocation
==17043== at 0x404BE6: unix_socket::sendMsg(char, double) (in /home/joao/CloudPT/Bolsa/Webots/controllers/darwin-pi2/client)
==17043==
==17043==
==17043== 100 errors in context 2 of 3:
==17043== Syscall param socketcall.sendto(msg) points to uninitialised byte(s)
==17043== at 0x5441DA2: send (send.c:28)
==17043== by 0x404C2D: unix_socket::sendMsg(char, double) (in /home/joao/CloudPT/Bolsa/Webots/controllers/darwin-pi2/client)
==17043== by 0x404E8A: unix_socket::sendVectorXd(Eigen::Matrix<double, -1, 1, 0, -1, 1> const&) (in /home/joao/CloudPT/Bolsa/Webots/controllers/darwin-pi2/client)
==17043== by 0x401F2A: main (in /home/joao/CloudPT/Bolsa/Webots/controllers/darwin-pi2/client)
==17043== Address 0x7feffff61 is on thread 1's stack
==17043== Uninitialised value was created by a stack allocation
==17043== at 0x404BE6: unix_socket::sendMsg(char, double) (in /home/joao/CloudPT/Bolsa/Webots/controllers/darwin-pi2/client)
==17043==
==17043==
==17043== 9900 errors in context 3 of 3:
==17043== Syscall param socketcall.sendto(msg) points to uninitialised byte(s)
==17043== at 0x5441DA2: send (send.c:28)
==17043== by 0x404C2D: unix_socket::sendMsg(char, double) (in /home/joao/CloudPT/Bolsa/Webots/controllers/darwin-pi2/client)
==17043== by 0x404EE8: unix_socket::sendVectorXd(Eigen::Matrix<double, -1, 1, 0, -1, 1> const&) (in /home/joao/CloudPT/Bolsa/Webots/controllers/darwin-pi2/client)
==17043== by 0x401F2A: main (in /home/joao/CloudPT/Bolsa/Webots/controllers/darwin-pi2/client)
==17043== Address 0x7feffff61 is on thread 1's stack
==17043== Uninitialised value was created by a stack allocation
==17043== at 0x404BE6: unix_socket::sendMsg(char, double) (in /home/joao/CloudPT/Bolsa/Webots/controllers/darwin-pi2/client)
==17043==
==17043== ERROR SUMMARY: 10100 errors from 3 contexts (suppressed: 0 from 0)
sendMsg(const char _type, const double _value)
是被指出错误的部分,属于 unix_socket
类。
//...
typedef struct{
char type;
double value;
} MESSAGE;
//...
int unix_socket::sendMsg(const char _type, const double _value){
MESSAGE msg;
msg.type=_type;
msg.value=_value;
int n = send(client_sock, &msg, sizeof(msg), 0);
if (n < 0) {
perror("send");
return -1;
}
c_sent=msg.type;
v_sent=msg.value;
return 0;
}
我不明白问题出在哪里。未初始化的值具体在哪里?或者我应该忽略Valgrind报告的错误?
value
是否对齐于1字节、2字节、4字节甚至8字节。如果我要编写这个代码,我可能会使用长度明确的协议,并具有打包和解包代码以确保值是正确的,从而消除对齐问题。 - WhozCraig