Hello,
The fault is generated by the expression
The code may be (in C++):Then, you can compile it with the following command:When the getservbyname() fuction returns NULL, the exception is thrown.
Hope this helps. Please let me know.
--
notes:
1) please, use code tags to include commands and/or their logs in the body of a message.
2) moved to "Programming" sub-forum.
The fault is generated by the expression
serv->s_port in the function call to ntohs(), due to the null pointer.The code may be (in C++):
Code:
#include <iostream>using namespace std;#include <stdio.h>#include <stdlib.h>#include <netdb.h>int main(int argc, char* argv[]) { #define WKPN_VPA 5164 const char * serviceName = "vpa"; const char * protocolName = "tcp"; int iVpaPort = 0; /* if the requested port number is not present in /etc/services, * an exception occurs. It should just return a null pointer. */ try { struct servent *serv = getservbyname(serviceName, protocolName); if( serv == NULL ){ throw(std::runtime_error("getservbyname error!"));} iVpaPort = ntohs(serv->s_port); } catch (const std::exception &e) { cerr << "Requested port not present in /etc/services" << endl; iVpaPort = WKPN_VPA; return(EXIT_FAILURE); } return(EXIT_SUCCESS);}Code:
g++ getservbyname.cpp -g -o getservbynameHope this helps. Please let me know.
--
notes:
1) please, use code tags to include commands and/or their logs in the body of a message.
2) moved to "Programming" sub-forum.
Statistics: Posted by Aki — 2024-07-29 13:48 — Replies 1 — Views 32