Hello @ all,
I hope you can give me some advice 
I will be following code for a tcp server and doStuff () function, the
clients treated. From some point, I have several identical
clients (zombies, I think), the same records in the database
write. Has anyone an explanation? What can I do?
int main(int argc, char *argv[])
{
int srvrSock; /* Socket descriptor for server */
int clntSock; /* Socket descriptor for client */
struct sockaddr_in echoServAddr; /* Local address */
struct sockaddr_in echoClntAddr; /* Client address */
unsigned short echoServPort; /* Server port */
unsigned int cliAddrLen; /* Length of incoming message */
int pid;
struct sigaction sa;
int loop;
char ip[16];
/* Test for correct number of parameters */
if (argc < 2) {
fprintf(stderr,"Verwendung: %s <TCP SERVER PORT>\n", argv[0]);
exit(1);
}
//end if
/* First arg: local port */
echoServPort = atoi(argv[1]);
/* Create socket for sending/receiving */
if ((srvrSock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
DieWithError("socket() failed");
//end if
/* Construct local address structure */
memset(&echoServAddr, 0, sizeof(echoServAddr)); /* Zero out
structure */
echoServAddr.sin_family = AF_INET; /* Internet
address family */
echoServAddr.sin_addr.s_addr = htonl(INADDR_ANY); /* Any incoming
interface */
echoServAddr.sin_port = htons(echoServPort); /* Local port */
/* Bind to the local address */
if (bind(srvrSock, (struct sockaddr *) &echoServAddr,
sizeof(echoServAddr)) < 0)
DieWithError("ERROR on binding");
//end if
/* Listen */
if (listen(srvrSock,5)<0)
DieWithError("listen() failed");
//end if
sa.sa_handler = sigchld_handler; // reap all dead processes
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
if (sigaction(SIGCHLD, &sa, NULL) == -1) {
perror("sigaction");
exit(1);
}
/* Set the size of the in-out parameter */
cliAddrLen = sizeof(echoClntAddr);
while (1) {
printf(" loop %d \n\n", loop);
loop++;
/* Wait for a client to connect */
if ((clntSock = accept(srvrSock, (struct sockaddr *)
&echoClntAddr, &cliAddrLen)) < 0)
DieWithError("accept() failed");
//end if
/* clntSock is connected to a client! */
strcpy(ip,inet_ntoa(echoClntAddr.sin_addr));
printf("Handling client %s\n", ip);
pid = fork();
if (pid < 0)
{
DieWithError("ERROR on fork");
}
else if (pid == 0)
{
close(srvrSock);
dostuff(clntSock,ip);
close(clntSock);
exit(0);
}
else close(clntSock);
} /* end of while */
return 0; /* we never get here */
}
--
Best regards
Burak Senel
not: sorry, for my bad english... and thank you PLUDI