Homework 14 & 15

1100012749

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Homework 14

9.11

A. 0 0 0 0 1 0 0 1 1 1 1 1 0 0

B.

Parameter	Value
VPN	0X09
TLB index	0x1
TLB tag	0x02
TLB hit?	N
Page fault?	N
PPN	0x17

C.
0 1 0 1 1 1 1 1 1 1 0 0

D.

Parameter	Value
Byte offset	0x0
Cache index	0xf
Cache tag	0x17
Cache hit?	N
Cache byte returned	-

9.12

A. 0 0 0 0 1 1 1 0 1 0 1 0 0 1

B.

Parameter	Value
VPN	0x0e
TLB index	0x2
TLB tag	0x03
TLB hit?	N
Page fault?	N
PPN	0x11

C. 0 1 0 0 0 1 1 0 1 0 0 1

D.

Parameter	Value
Byte offset	0x1
Cache index	0xa
Cache tag	0x11
Cache hit?	N
Cache byte returned	-

9.13

A. 0 0 0 0 0 0 0 1 0 0 0 0 0 0

B.

Parameter	Value
VPN	0x01
TLB index	0x1
TLB tag	0x00
TLB hit?	N
Page fault?	Y
PPN	-

C. -

D. -

9.14

#include <fcntl.h> 
#include <sys/mman.h>
#include <unistd.h>
int main()
{
    int fd;
    char *map_addr;
    fd = open("hello.txt", O_RDWR, NULL);
    map_addr = (char *) mmap(NULL, 1, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
    close(fd);
    if (map_addr == MAP_FAILED) return -1;
    *map_addr = 'J';
    munmap(map_addr, 1);
    return 0;
}

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Homework 15

10.6

fd2 = 4

10.7

int main(int argc, char **argv) {
    int n;
    rio_t rio;
    char buf[MAXBUF];
    Rio_readinitb(&rio, STDIN_FILENO);
    while ((n = Rio_readnb(rio, buf, MAXBUF)) != 0) {
        Rio_write(STDOUT_FILENO, buf, n);
    }
    return 0;
}

10.9

if (fork() == 0) {
    int fd = open("foo.txt", O_RDONLY, 0);
    dup2(fd, STDIN_FILENO);
    clode(fd);
    execve("fstatcheck", argv, envp);
}