start up cleanly

[unix-history] / usr / src / old / implogd / implogd.c

/*      implogd.c       4.2     82/10/10        */

#include <time.h>
#include <sgtty.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/in.h>

#define LOGFILE "/usr/adm/implog"
#define IMPMTU  ((8159 / 8) & ~01)

u_char  request[1024];
int     marktime();
int     options;
extern  int errno;
int     log;

/*
* Socket address, internet style, with
* unused space taken by timestamp and packet
* size.
*/
struct sockstamp {
       short   sin_family;
       u_short sin_port;
       struct  in_addr sin_addr;
       time_t  sin_time;
       int     sin_cc;
};

struct  sockproto improto = { PF_IMPLINK, 0 };
struct  sockstamp from;

main(argc, argv)
       char *argv[];
{
       int s, cc;
       time_t t;

       argc--, argv++;
       if (argc > 0 && !strcmp(argv[0], "-d"))
               options |= SO_DEBUG;
#ifndef DEBUG
       if (fork())
               exit(0);
       for (s = 0; s < 10; s++)
               (void) close(t);
       (void) open("/", 0);
       (void) dup2(0, 1);
       (void) dup2(0, 2);
       { int tt = open("/dev/tty", 2);
         if (tt > 0) {
               ioctl(tt, TIOCNOTTY, 0);
               close(tt);
         }
       }
#endif
       log = open(LOGFILE, 1);
       if (log < 0)
               exit(1);
       lseek(log, 0L, 2);
       from.sin_time = time(0);
       from.sin_cc = sizeof(time_t);
       write(log, (char *)&from, sizeof(from));
again:
       errno = 0;
       if ((s = socket(SOCK_RAW, &improto, 0, options)) < 0) {
               perror("socket");
               sleep(5);
               goto again;
       }
       for (;;) {
               cc = receive(s, &from, request, sizeof(request));
               if (cc <= 0)
                       continue;
               if (cc > IMPMTU)        /* sanity */
                       continue;
               from.sin_cc = cc;
               from.sin_time = time(0);
               write(log, (char *)&from, sizeof(from));
               write(log, request, cc);
       }
       /*NOTREACHED*/
}