Segmentation fault on TCP server.
I have developed a server in C ++ and a client that connects to it.
I run it on a PC with linux.
When we run the server and a client is connected to it, a
Segmentation fault on the server, specifically, on the line:
sClient = ((struct ThreadArgs *) threadArgs) -> sClient;
Attached is the source code of the server:
ServerTCP.h
ifndef SERVER_TCP
define SERVER_TCP
include <stdio.h>
include <sys/socket.h>
include <arpa/inet.h>
include <stdlib.h>
include <string.h>
include <unistd.h>
include <pthread.h>
struct ThreadArgs
{
int sClient;
};
typedef void* (*THREAD_FUNC_PTR)(void *);
class ServerTCP
{
private:
int sPort;
public:
ServerTCP(unsigned int port);
void *ThreadMain(void *threadArgs);
void waitConnections();
};
endif
ServerTCP.cpp
include "ServerTCP.h"
define MAX_DATA_LENGTH 65000
ServerTCP::ServerTCP (unsigned int port)
{
sPort = port;
}
void* ServerTCP::ThreadMain(void *threadArgs)
{
int sClient;
int ret;
char data_in[MAX_DATA_LENGTH];
pthread_detach(pthread_self() ) ;
//>>> SIGSEGV, Segmentation fault
sClient = ((struct ThreadArgs *) threadArgs) -> sClient;
free(threadArgs);
ret = 1;
while (ret != 0)
{
ret = recv(sClient, data_in, MAX_DATA_LENGTH, 0);
if (ret < 0)
{
printf("Error: Call to recv(sClient, frame_in, sizeof(frame_in), 0); has failed.\n");
exit(1);
}
}
close(sClient);
return NULL;
}
void ServerTCP::waitConnections()
{
int ret;
unsigned int iPort, iAddrLen;
int sListen, sClient;
struct sockaddr_in addr, remote_addr;
pthread_t threadID;
struct ThreadArgs *threadArgs;
sListen = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
if (sListen < 0)
{
printf("Error: Call to socket(AF_INET, SOCK_STREAM, IPPROTO_IP); has failed.\n");
exit(1);
}
iPort = sPort;
addr.sin_family = AF_INET;
addr.sin_port = htons(iPort);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
sListen = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
if (sListen < 0)
{
printf("Error: Call to socket(AF_INET, SOCK_STREAM, IPPROTO_IP); has failed.\n");
exit(1);
}
addr.sin_family = AF_INET;
addr.sin_port = htons(iPort);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
ret = bind(sListen, (struct sockaddr *) &addr, sizeof(addr));
if(ret < 0)
{
printf("Error: Call to bind(sListen, (struct sockaddr *) &addr, sizeof(addr)); has failed.\n");
exit(1);
}
ret = listen(sListen, 10);
if(ret < 0)
{
printf("Error: Call to listen(sListen, 10); has failed.\n");
exit(1);
}
for(;;)
{
printf("Waiting for connection from a client...\n");
iAddrLen = sizeof(remote_addr); sClient = accept(sListen, (struct sockaddr *) &remote_addr, &iAddrLen); if(sClient < 0) { printf("Error: Call to accept(sListen, (struct sockaddr *) remote_addr, sizeof(remote_addr)); has failed.\n"); exit(1); } printf("%s has connected.\n\n", inet_ntoa(remote_addr.sin_addr)); if ((threadArgs = (struct ThreadArgs *) malloc(sizeof(struct ThreadArgs))) == NULL) { printf("Error: malloc() for threadArgs has failed.\n"); exit(1); } threadArgs -> sClient = sClient; printf ("sClient = %d, threadArgs -> sClient = %d\n", sClient, threadArgs -> sClient); if (pthread_create(&threadID, NULL, (THREAD_FUNC_PTR)&ServerTCP::ThreadMain, (void *)threadArgs) != 0) { printf("Error: pthread_create() has failed.\n"); exit(1); }
}
}
int main(int argc, const char* argv[])
{
ServerTCP serverTCP(5772);
serverTCP.waitConnections();
return 0;
}
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