Dev Random C
- The random numbers it generates are made available through the /dev/random and /dev/urandom character devices. The difference between /dev/random and /dev/urandom is that the former is a blocking device, which means it stops supplying numbers when it determines that the amount of entropy is insufficient for generating a properly random output.
- If you need a certain number of random bytes, read that number of bytes from /dev/urandom. It is a 'special file' that is made to be like a file to read random numbers from. Using cat to read from /dev/urandom is a bad idea, because it will try to read /dev/urandom to the end - but it does not end. You can use head.
- The C Standard Library
- C Standard Library Resources
/dev/random C
- C Programming Resources
/dev/urandom is just a link to /dev/random and only blocks until properly seeded. This means that after boot, FreeBSD is smart enough to wait until enough seed entropy has been gathered before delivering a never-ending stream of random goodness. You should use /dev/urandom, not /dev/random.The two differences between /dev/random and /dev/urandom are (I am talking about Linux here): /dev/random might be theoretically better in the context of an information-theoretically secure algorithm.This is the kind of algorithm which is secure against today's technology, and also tomorrow's technology, and technology used. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Visit Stack Exchange. The character special files /dev/random and /dev/urandom (present since Linux 1.3.30) provide an interface to the kernel's random number generator. File /dev/random has major device number 1 and minor device number 8. File /dev/urandom has major device number 1 and minor device number 9.
- Selected Reading
Description
The C library function int rand(void) returns a pseudo-random number in the range of 0 to RAND_MAX.
RAND_MAX is a constant whose default value may vary between implementations but it is granted to be at least 32767.
Declaration
Following is the declaration for rand() function.
Parameters
NA
Return Value
This function returns an integer value between 0 and RAND_MAX.
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Example
The following example shows the usage of rand() function.
Let us compile and run the above program that will produce the following result −