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#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <semaphore.h>
#include <stdio.h>
#include <aes.h>
sem_t *enc_sem, *get_sem;
#define SHM_SIZE 64*1024
void child(pid_t parent, void* mem)
{
char key[16];
char iv[16];
struct crypto_aes_ctx ctx;
uint32_t mem_size;
for (;;) {
memset(key, 0xa3, sizeof(key));
memset(iv, 0x3, sizeof(iv));
sem_wait(enc_sem);
crypto_aes_expand_key(&ctx, (void*)key, sizeof(key));
memcpy(&mem_size, mem, sizeof(mem_size));
crypto_cbc_encrypt(&ctx, mem, mem_size, mem, iv);
sem_post(get_sem);
}
}
static int must_finish = 0;
static void alarm_handler(int signo)
{
must_finish = 1;
}
static double udifftimeval(struct timeval start, struct timeval end)
{
return (double)(end.tv_usec - start.tv_usec) +
(double)(end.tv_sec - start.tv_sec) * 1000 * 1000;
}
static void value2human(double bytes, double time, double* data, double* speed,char* metric)
{
if (bytes > 1000 && bytes < 1000*1000) {
*data = ((double)bytes)/1000;
*speed = *data/time;
strcpy(metric, "Kb");
return;
} else if (bytes >= 1000*1000 && bytes < 1000*1000*1000) {
*data = ((double)bytes)/(1000*1000);
*speed = *data/time;
strcpy(metric, "Mb");
return;
} else if (bytes >= 1000*1000*1000) {
*data = ((double)bytes)/(1000*1000*1000);
*speed = *data/time;
strcpy(metric, "Gb");
return;
} else {
*data = (double)bytes;
*speed = *data/time;
strcpy(metric, "bytes");
return;
}
}
void parent(pid_t child, void* mem)
{
struct timeval start, end;
uint32_t chunksize;
double total = 0;
double secs, ddata, dspeed;
char metric[16];
signal(SIGALRM, alarm_handler);
/* set a default value in shared memory */
for (chunksize = 256; chunksize <= (64 * 1024); chunksize *= 2) {
memset(mem, 0x33, chunksize);
printf("\tEncrypting in chunks of %d bytes: ", chunksize);
fflush(stdout);
total = 0;
must_finish = 0;
alarm(5);
gettimeofday(&start, NULL);
do {
memcpy(mem, &chunksize, sizeof(chunksize));
sem_post(enc_sem);
sem_wait(get_sem);
total+=chunksize;
} while(must_finish == 0);
gettimeofday(&end, NULL);
secs = udifftimeval(start, end)/ 1000000.0;
value2human(total, secs, &ddata, &dspeed, metric);
printf ("done. %.2f %s in %.2f secs: ", ddata, metric, secs);
printf ("%.2f %s/sec\n", dspeed, metric);
}
}
int main()
{
int shmid, shmid2;
char c, *shm, *s, *semmem;
pid_t pid;
signal(SIGUSR1, SIG_IGN);
signal(SIGUSR2, SIG_IGN);
if ((shmid = shmget(IPC_PRIVATE, SHM_SIZE, IPC_CREAT | 0660)) < 0) {
perror("shmget fail");
return 1;
}
if ((shm = (char *) shmat(shmid, 0, 0)) == (char *) -1) {
perror("shmat : parent");
return 2;
}
if ((shmid2 = shmget(IPC_PRIVATE, 2*sizeof(sem_t), IPC_CREAT | 0660)) < 0) {
perror("shmget fail");
return 1;
}
if ((semmem = (char *) shmat(shmid2, 0, 0)) == (char *) -1) {
perror("shmat : parent");
return 2;
}
enc_sem = (void*)semmem;
get_sem = (void*)semmem + sizeof(sem_t);
sem_init(enc_sem, 1, 0);
sem_init(get_sem, 1, 0);
printf("Addresses in parent\n");
printf("shared mem: %p\n", shm);
s = shm; // s now references shared mem
for (c = 'A'; c <= 'Z'; ++c) // put some info there
*s++ = c;
*s = '\0'; // terminate the sequence
switch (pid=fork()) {
case -1:
perror("fork");
return 3;
default:
parent(pid, shm);
kill(pid, SIGTERM);
wait(0); // let the child finish
shmdt(shm);
shmctl(shmid, IPC_RMID, (struct shmid_ds *) 0);
break;
case 0:
child(getppid(), shm);
shmdt(shm);
break;
}
return 0;
}
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