Random number generation. More...

#include <stddef.h>
#include <stdlib.h>
#include <time.h>

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)

void	srandom (unsigned int seed)
	Seed the pseudo-random number generator. More...

long int	random (void)
	Generate a pseudo-random number between 0 and 2147483647L or 2147483562? More...

Variables
static int32_t	rnd_seed = 0

Detailed Description

Random number generation.

Definition in file random.c.

Function Documentation

◆ FILE_LICENCE()

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )

◆ srandom()

void srandom ( unsigned int seed )

Seed the pseudo-random number generator.

Parameters

seed	Seed value

Definition at line 20 of file random.c.

                                    {
         rnd_seed = seed;
         if ( ! rnd_seed )
                 rnd_seed = 4; /* Chosen by fair dice roll */
 }

References rnd_seed.

Referenced by random(), srand(), and tcpip_random_okx().

◆ random()

long int random ( void )

Generate a pseudo-random number between 0 and 2147483647L or 2147483562?

Return values

rand	Pseudo-random number

Definition at line 31 of file random.c.

                          {
         int32_t q;
 
         /* Initialize linear congruential generator */
         if ( ! rnd_seed )
                 srandom ( time ( NULL ) );
 
         /* simplified version of the LCG given in Bruce Schneier's
            "Applied Cryptography" */
         q = ( rnd_seed / 53668 );
         rnd_seed = ( 40014 * ( rnd_seed - 53668 * q ) - 12211 * q );
         if ( rnd_seed < 0 )
                 rnd_seed += 2147483563L;
         return rnd_seed;
 }

References NULL, rnd_seed, srandom(), and time.

Referenced by arbel_alloc_qpn(), cipher_cost(), digest_cost(), dns_send_packet(), eap_rx_mschapv2_request(), efi_pxe_udp_write(), efi_snp_hii_random_guid(), eth_random_addr(), forcedeth_open(), hermon_alloc_qpn(), http_digest_authenticate(), ib_create_conn(), ib_create_qp(), inject_corruption_nonzero(), inject_fault_nonzero(), iscsi_handle_chap_c_value(), iscsi_open_connection(), loopback_test(), memcpy_test_speed(), ntlm_response(), peerdisc_create(), profile_test_exec(), rand(), start_dhcp(), start_dhcpv6(), tcp_open(), tcpip_bind(), tcpip_random_okx(), tls_client_hello(), tls_new_server_hello(), tls_send_client_key_exchange_pubkey(), vmbus_open(), and wep_encrypt().

Variable Documentation

◆ rnd_seed

int32_t rnd_seed = 0

static

Definition at line 13 of file random.c.

Referenced by random(), and srandom().

Functions