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client.c
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client.c
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#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <time.h>
#define FIB_DEV "/dev/fibonacci"
int main()
{
struct timespec start, finish;
long long k = 1;
char buf[50];
char write_buf[] = "testing writing";
int offset = 110; /* TODO: try test something bigger than the limit */
FILE *fout;
fout = fopen("correct.txt", "w+t");
if (fout == NULL) {
printf("error");
}
int fd = open(FIB_DEV, O_RDWR);
if (fd < 0) {
perror("Failed to open character device");
exit(1);
}
for (int i = 0; i <= 100; i++) {
// sz = write(fd, write_buf, strlen(write_buf));
printf("Writing to " FIB_DEV ", returned the sequence %lld\n", k);
}
for (int i = 0; i <= offset; i++) {
long ker;
lseek(fd, i, SEEK_SET);
clock_gettime(CLOCK_REALTIME, &start);
read(fd, buf, 50);
clock_gettime(CLOCK_REALTIME, &finish);
printf("Reading from " FIB_DEV
" at offset %d, returned the sequence "
"%s.\n",
i, buf);
ker = write(fd, write_buf, strlen(write_buf));
fprintf(fout, "%d %ld %ld %ld\n", i, finish.tv_nsec - start.tv_nsec,
ker, finish.tv_nsec - start.tv_nsec - ker);
}
for (int i = offset; i >= 0; i--) {
lseek(fd, i, SEEK_SET);
read(fd, buf, 50);
printf("Reading from " FIB_DEV
" at offset %d, returned the sequence "
"%s.\n",
i, buf);
}
close(fd);
fclose(fout);
return 0;
}