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test.txt

​x
 
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
​
void readFromBinary(int fd, void* readInfo, int offset, int numBytes)
{
    if(pread(fd,readInfo,numBytes,offset) == -1)
    {
        readInfo = 0;
    }
}
​
int testFAT(int fd)
{
    unsigned char BPB_NumFATs;
    readFromBinary(fd, &BPB_NumFATs, 16, 1);
    return BPB_NumFATs;
}
​
int main(void) {
    int fd = open("test.txt", O_RDONLY);
    printf("fd = %d\n", fd);
    printf("testFAT(fd) = %d\n", testFAT(fd));
    close(fd);
    return 0;
}
​

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fd = 4
testFAT(fd) = 71

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