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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>
#define FIB_DEV "/dev/fibonacci"
int main()
{
char buf[64];
int offset = 100; /* TODO: try test something bigger than the limit */
int fd = open(FIB_DEV, O_RDWR);
if (fd < 0) {
perror("Failed to open character device");
exit(1);
}
for (int i = 0; i <= offset; i++) {
printf("Writing to " FIB_DEV ", returned the sequence 1\n");
}
for (int i = 0; i <= offset; i++) {
lseek(fd, i, SEEK_SET);
read(fd, buf, 1);
printf("Reading from " FIB_DEV
" at offset %d, returned the sequence "
"%s.\n",
i, buf);
}
for (int i = offset; i >= 0; i--) {
lseek(fd, i, SEEK_SET);
read(fd, buf, 1);
printf("Reading from " FIB_DEV
" at offset %d, returned the sequence "
"%s.\n",
i, buf);
}
close(fd);
return 0;
}