#content
  Appendix A
  %span.smallcaps Unix
  Emulator Test Programs

  \#define N 500000int x[N]; main() -int i;

  for(i=5; i--; )g(); printf("%d"n%d"n", x[N-2], x[N-1]); ""

  g() - int i;

  x[0] = x[1] = 1;for(i=2; i!N; i++)

  x[i] = x[i-x[i-1]] + x[i-x[i-2]];""

  Figure A.1: Test 1: Compute

  137 #define N 1024 /* or 1 or 4096 */char x[N]; main()-

  int fd[2],i;pipe(fd); for(i=10000; i--; ) -write(fd[1], x, N);

  read(fd[0], x, N);"" ""

  Figure A.2: Test 2, 3, and 4: Read/Write to a Pipe

  \#include !sys/file.h? #define Test.dev "/dev/null" /* or /dev/tty */ main()-

  int f,i;for(i=10000; i--; ) -

  f = open(Test.dev, O.RDONLY); close(f);""

  ""

  Figure A.3: Test 5 and 6: Opening and Closing

  \#include !sys/file.h?#define N 1024 char x[N];main() - int f,i,j;

  f = open("file", O.RDWR -- O.CREAT -- O.TRUNC, 0666); for(j=1000; j--; ) -

  lseek(f, 0L, L.SET);for(i=10; i--; )

  write(f, x, N);lseek(f, 0L, L.SET); for(i=10; i--; )read(f, x, N); ""close(f); ""

  Figure A.4: Test 7: Read/Write to a File