/* sysinfo.c 
 * Neal Nelson
 *
 * Display:
 *   CPU type and model,
 *   kernel version,
 *   amount of time since system was last booted in the form dd:hh:mm:ss
 *
 *   COMMENTS: Clean up the time calculations (use %, dummy).
 */

#include <stdio.h>
#include <stdlib.h>

#define MAXLINE 80

main(int argc, char *argv[])
{ char buf[MAXLINE+1];   /* room for the string terminator zero */
  FILE *fp;
  float uptime, idletime;
  int i,dd,hh,mm,ss;

  if (argc != 1)
  { printf("usage: sysinfo\n");
    exit(1);
  }

  /* 1. print the cpu type and model in the 5th line */
  if ( (fp = fopen("/proc/cpuinfo","r")) == NULL)
  { printf( "Unable to open /proc/cpuinfo\n" );
    exit(1);
  }
  for (i = 0; i < 4; i++) fgets(buf, MAXLINE+1,fp);
  printf("%s",fgets(buf,MAXLINE+1,fp));
  

  /* 2. print the system ostype and osrelease */

  /* print the system ostype */
  if ( (fp = fopen("/proc/sys/kernel/ostype","r")) == NULL)
  { printf( "Unable to open /proc/sys/kernel/ostype\n" );
    exit(1);
  }
  printf("ostype           : %s",fgets(buf,MAXLINE+1,fp));

  /* print the osrelease */
  if ( (fp = fopen("/proc/sys/kernel/osrelease","r")) == NULL)
  { printf( "Unable to open /proc/sys/kernel/osrelease\n" );
    exit(1);
  }
  printf("osrelease       : %s",fgets(buf,MAXLINE+1,fp));

  /* 3. print the amout of time in seconds since the last system boot */
  
  if ( (fp = fopen("/proc/uptime","r")) == NULL)
  { printf( "Unable to open /proc/uptime\n" );
    exit(1);
  }
  /* fgets(buf, MAXLINE+1,fp); */
  fscanf(fp, "%f %f", &uptime, &idletime);
  printf("uptime          : %f seconds\n",uptime);
  mm = (int)(uptime/60);
  ss = (int)(uptime - mm*60);
  hh = (int)(mm/60);
  mm = mm - hh*60;
  dd = (int)(uptime/60/60/24);
  printf("uptime          : %d:%d:%d:%d dd:hh:mm:ss\n",dd,hh,mm,ss);

  exit(0);

}