#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/file.h>

int main(int, char **);
int main(int ac, char **av)
{
 int n;
 int lfd;
 char buf[256];

 if (ac != 2)
  { fprintf(stderr,"Usage: %s logfile\n",av[0]);
    exit(1);
  }
 sigblock(~0);
 while (1)
  { n = read(0,&buf[0],sizeof(buf));
    if (n < 1) exit(0);
    lfd = open(av[1],O_WRONLY|O_CREAT|O_APPEND,0666);
    if (lfd >= 0)
     { write(lfd,&buf[0],n);
       close(lfd);
     }
    else
     { write(2,&buf[0],n);
     }
  }
}