개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

rand(3c)

rand(3C)                 Standard C Library Functions                 rand(3C)

NAME
       rand, srand, rand_r - simple random-number generator

SYNOPSIS
       #include <stdlib.h>

       int rand(void);


       void srand(unsigned int seed);


       int rand_r(unsigned int *seed);

DESCRIPTION
       The  rand()  function  uses a multiplicative congruential random-number
       generator with period 2^32 that returns successive  pseudo-random  num‐
       bers in the range of 0 to RAND_MAX (defined in <stdlib.h>).


       The  srand()  function  uses  the argument seed as a seed for a new se‐
       quence of pseudo-random numbers to be returned by subsequent  calls  to
       rand().  If  srand()  is  then called with the same seed value, the se‐
       quence of pseudo-random numbers will be repeated. If rand()  is  called
       before  any  calls to srand() have been made, the same sequence will be
       generated as when srand() is first called with a seed value of 1.


       The rand_r() function has the same functionality as rand() except  that
       a pointer to a seed seed must be supplied by the caller. If rand_r() is
       called  with  the  same initial value for the object pointed to by seed
       and that object is not modified between successive calls  to  rand_r(),
       the  same  sequence  as that produced by calls to rand() will be gener‐
       ated.


       The rand() and  srand()  functions  provide  per-process  pseudo-random
       streams  shared  by all threads. The same effect can be achieved if all
       threads call rand_r() with a pointer  to  the  same  seed  object.  The
       rand_r()  function  allows a thread to generate a private pseudo-random
       stream by having the seed object be private to the thread.

USAGE
       The spectral properties of rand() are limited. The drand48(3C) function
       provides a better, more elaborate random-number generator.


       Programmers should use /dev/urandom or /dev/random for most random-num‐
       ber generation, especially for cryptographic purposes. See random(4D).

ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE  TYPEAT‐
       TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelSafe _ Standard‐
       See standards(7).


SEE ALSO
       drand48(3C), random(4D), attributes(7), standards(7)

Oracle Solaris 11.4               16 May 2014                         rand(3C)