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#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <varargs.h>
#include <signal.h>
#define SERV_TCP_PORT 110
char *pname = NULL;
pid_t pgrpid;
int clean=0;
extern int errno;
extern int sys_nerr;
extern char *sys_errlist[];
void reaper();
void cleanup();
main(argc, argv)
int argc;
char *argv[];
{
int sockfd, newsockfd, clilen, childpid;
struct sockaddr_in cli_addr, serv_addr;
pname = argv[0];
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
err_dump("Server : Can't open stream socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(SERV_TCP_PORT);
if(bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
err_dump("Server : Can't bind local address");
listen(sockfd, 5);
signal(SIGCHLD, reaper);
signal(SIGTERM, cleanup);
pgrpid = setpgrp();
for(;;) {
if(clean)
{
close(sockfd);
exit(0);
}
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
if(newsockfd < 0)
{
if(errno == EINTR)
continue;
err_dump("Server: accept error");
}
if((childpid = fork()) < 0)
err_dump("Server : fork error");
else if(childpid == 0) {
close(sockfd);
dup2(newsockfd,0);
dup2(newsockfd,1);
dup2(newsockfd,2);
close(newsockfd);
printf("Starting the popper server\n");
popper(argc,argv);
exit(0);
}
close(newsockfd);
}
}
err_dump(va_alist)
va_dcl
{
va_list args;
char *fmt;
va_start(args);
if(pname != NULL)
fprintf(stderr, "%s: ", pname);
fmt = va_arg(args, char *);
vfprintf(stderr, fmt, args);
va_end(args);
my_perror();
fflush(stdout);
fflush(stderr);
abort();
exit(1);
}
my_perror()
{
char *sys_err_str();
fprintf(stderr, " %s\n", sys_err_str());
}
char *sys_err_str()
{
static char msgstr[200];
if(errno != 0)
if(errno > 0 && errno < sys_nerr)
sprintf(msgstr,"(%s)", sys_errlist[errno]);
else
sprintf(msgstr,"(errno = %d)", errno);
else
msgstr[0] = '\0';
return(msgstr);
}
void reaper()
{
int stts;
while(wait3(&stts, WNOHANG, (struct rusage *)0) >= 0);
signal(SIGCHLD, reaper);
}
void cleanup()
{
killpg(pgrpid,SIGHUP);
clean = 1;
}
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