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DRAND48_R(3) Linux Programmer’s Manual DRAND48_R(3) 名前 drand48_r, erand48_r, lrand48_r, nrand48_r, mrand48_r, jrand48_r, srand48_r, seed48_r, lcong48_r - 一様分布する疑似乱数をリエントラント (reentrant) に生成する書式 #include int drand48_r(struct drand48_data *buffer, double *result); int erand48_r(unsigned short xsubi[3], struct drand48_data *buffer, double *result); int lrand48_r(struct drand48_data *buffer, long int *result); int nrand48_r(unsigned short int xsubi[3], struct drand48_data *buffer, long int *result); int mrand48_r(struct drand48_data *buffer,long int *result); int jrand48_r(unsigned short int xsubi[3], struct drand48_data *buffer, long int *result); int srand48_r(long int seedval, struct drand48_data *buffer); int seed48_r(unsigned short int seed16v[3], struct drand48_data *buffer); int lcong48_r(unsigned short int param[7], struct drand48_data *buffer); glibc 向けの機能検査マクロの要件 (feature_test_macros(7) 参照): 上記の全ての関数: _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE 説明これらの関数は drand48(3) で説明されている関数に類似するリエントラントな関数である。大域的な乱数生成の状態を変更する代わりに、これらの関数は指定されたデータ buffer を使う。最初に使う前に、この構造体は初期化されていなければならない。初期化は、たとえば 0 で埋めたり、関数 srand48_r(), seed48_r(), lcong48_r() のいずれかを呼び出すことによって行われる。返り値返り値は 0 である。準拠これらの関数は GNU による拡張であり、移植性はない。関連項目 drand48(3), rand(3), random(3) GNU 2007-07-26 DRAND48_R(3)

DRAND48_R(3) Linux Programmer’s Manual DRAND48_R(3) NAME drand48_r, erand48_r, lrand48_r, nrand48_r, mrand48_r, jrand48_r, srand48_r, seed48_r, lcong48_r - generate uniformly distributed pseudo- random numbers reentrantly SYNOPSIS #include int drand48_r(struct drand48_data *buffer, double *result); int erand48_r(unsigned short xsubi[3], struct drand48_data *buffer, double *result); int lrand48_r(struct drand48_data *buffer, long int *result); int nrand48_r(unsigned short int xsubi[3], struct drand48_data *buffer, long int *result); int mrand48_r(struct drand48_data *buffer,long int *result); int jrand48_r(unsigned short int xsubi[3], struct drand48_data *buffer, long int *result); int srand48_r(long int seedval, struct drand48_data *buffer); int seed48_r(unsigned short int seed16v[3], struct drand48_data *buffer); int lcong48_r(unsigned short int param[7], struct drand48_data *buffer); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): All functions shown above: _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE DESCRIPTION These functions are the reentrant analogs of the functions described in drand48(3). Instead of modifying the global random generator state, they use the supplied data buffer. Before the first use, this struct must be initialized, for example, by filling it with zeros, or by calling one of the functions srand48_r(), seed48_r(), or lcong48_r(). RETURN VALUE The return value is 0. CONFORMING TO These functions are GNU extensions and are not portable. SEE ALSO drand48(3), rand(3), random(3) COLOPHON This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU 2007-07-26 DRAND48_R(3)

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