CentOS 7.0 - man page for rand_load_file (centos section 3)
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RAND_load_file(3) OpenSSL RAND_load_file(3)
RAND_load_file, RAND_write_file, RAND_file_name - PRNG seed file
const char *RAND_file_name(char *buf, size_t num);
int RAND_load_file(const char *filename, long max_bytes);
int RAND_write_file(const char *filename);
RAND_file_name() generates a default path for the random seed file. buf points to a buffer
of size num in which to store the filename. The seed file is $RANDFILE if that environment
variable is set, $HOME/.rnd otherwise. If $HOME is not set either, or num is too small for
the path name, an error occurs.
RAND_load_file() reads a number of bytes from file filename and adds them to the PRNG. If
max_bytes is non-negative, up to to max_bytes are read; starting with OpenSSL 0.9.5, if
max_bytes is -1, the complete file is read.
RAND_write_file() writes a number of random bytes (currently 1024) to file filename which
can be used to initialize the PRNG by calling RAND_load_file() in a later session.
RAND_load_file() returns the number of bytes read.
RAND_write_file() returns the number of bytes written, and -1 if the bytes written were
generated without appropriate seed.
RAND_file_name() returns a pointer to buf on success, and NULL on error.
rand(3), RAND_add(3), RAND_cleanup(3)
RAND_load_file(), RAND_write_file() and RAND_file_name() are available in all versions of
SSLeay and OpenSSL.
1.0.1e 2013-02-11 RAND_load_file(3)
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