ldns(3) Library Functions Manual ldns(3)

# [NAME](#NAME)

ldns\_init\_random - seed the random function

# [SYNOPSIS](#SYNOPSIS)

#include <stdint.h>  
#include <stdbool.h>

#include <ldns/ldns.h>

int ldns\_init\_random(FILE \*fd, unsigned int size);

# [DESCRIPTION](#DESCRIPTION)

*ldns\_init\_random*() Seed the random function. If the file descriptor is specified, the random generator is seeded with data from that file. If not, /dev/urandom is used.

applications should call this if they need entropy data within ldns If openSSL is available, it is automatically seeded from /dev/urandom or /dev/random.

If you need more entropy, or have no openssl available, this function MUST be called at the start of the program

If openssl \*is* available, this function just adds more entropy

**fd**: a file providing entropy data for the seed  
**size**: the number of bytes to use as entropy data. If this is 0, only the minimal amount is taken (usually 4 bytes)  
Returns 0 if seeding succeeds, 1 if it fails

# [AUTHOR](#AUTHOR)

The ldns team at NLnet Labs.

# [REPORTING BUGS](#REPORTING_BUGS)

Please report bugs to dns-team@nlnetlabs.nl or on GitHub at https://github.com/NLnetLabs/ldns/issues

# [COPYRIGHT](#COPYRIGHT)

Copyright (c) 2004 - 2006 NLnet Labs.

Licensed under the BSD License. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

# [SEE ALSO](#SEE_ALSO)

*ldns\_sign\_public*, *ldns\_key*. And **perldoc Net::DNS**, **RFC1034**, **RFC1035**, **RFC4033**, **RFC4034** and **RFC4035**.

# [REMARKS](#REMARKS)

This manpage was automatically generated from the ldns source code.

30 May 2006

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Document: ldns_init_random(3) from ldns 1.9.2-r2 (Chainguard OS)
Source: https://github.com/NLnetLabs/ldns.git