Import translated manuals from JM CVS Repository.

[linuxjm/jm.git] / manual / LDP_man-pages / release / man3 / getgrouplist.3

.\" Copyright (C) 2008, Linux Foundation, written by Michael Kerrisk
.\" <mtk.manpages@gmail.com>
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein.  The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" A few pieces remain from an earlier version written in
.\" 2002 by Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\"
.\" Japanese Version Copyright (c) 2004 Yuichi SATO
.\"         all rights reserved.
.\" Translated 2004-08-07, Yuichi SATO <ysato444@yahoo.co.jp>
.\" Updated 2008-08-11, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.05
.\"
.TH GETGROUPLIST 3 2009-07-03 "GNU" "Linux Programmer's Manual"
.SH ̾Á°
getgrouplist \- ¥æ¡¼¥¶¤¬½ê°¤¹¤ë¥°¥ë¡¼¥×¤Î¥ê¥¹¥È¤ò¼èÆÀ¤¹¤ë
.SH ½ñ¼°
.B #include <grp.h>
.sp
.BI "int getgrouplist(const char *" user ", gid_t " group ,
.br
.BI "                 gid_t *" groups ", int *" ngroups );
.sp
.in -4n
glibc ¸þ¤±¤Îµ¡Ç½¸¡ºº¥Þ¥¯¥í¤ÎÍ×·ï
.RB ( feature_test_macros (7)
»²¾È):
.in
.sp
.BR getgrouplist ():
_BSD_SOURCE
.SH ÀâÌÀ
.BR getgrouplist ()
´Ø¿ô¤Ï¡¢¥°¥ë¡¼¥×¥Ç¡¼¥¿¥Ù¡¼¥¹
.RB ( group (5)
»²¾È) ¤òÄ´¤Ù¤Æ¡¢
.I user
¤¬½ê°¤¹¤ë¥°¥ë¡¼¥×¤Î¥ê¥¹¥È¤ò¼èÆÀ¤¹¤ë¡£
¸«¤Ä¤«¤Ã¤¿¥°¥ë¡¼¥×¤Î¤¦¤ÁºÇÂç
.I *ngroups
¸Ä¤Î¥°¥ë¡¼¥×¤¬¡¢ÇÛÎó
.I groups
¤Ë³ÊǼ¤µ¤ì¤ÆÊÖ¤µ¤ì¤ë¡£

°ú¤­¿ô
.I group
¤¬¥°¥ë¡¼¥×¥Ç¡¼¥¿¥Ù¡¼¥¹¤Ë
.I user
¤¬½ê°¤¹¤ë¥°¥ë¡¼¥×¤¬¤Ê¤«¤Ã¤¿¾ì¹ç¡¢
.BR getgrouplist ()
¤¬ÊÖ¤¹¥°¥ë¡¼¥×¤Î¥ê¥¹¥È¤Ë°ú¤­¿ô
.I group
¤âÄɲ䵤ì¤ë¡£
Ä̾ï¤Ï¡¢¤³¤Î°ú¤­¿ô¤Ë¤Ï¥æ¡¼¥¶
.I user
¤Î¥Ñ¥¹¥ï¡¼¥É¥ì¥³¡¼¥É¤Ë½ñ¤«¤ì¤Æ¤¤¤ë¥°¥ë¡¼¥× ID ¤ò»ØÄꤹ¤ë¡£

°ú¤­¿ô
.I ngroups
¤Ï¡¢ÃÍÅϤ·¤È·ë²Ì¤ÎξÊý¤Ë»ÈÍѤµ¤ì¤ë°ú¤­¿ô (value-result argument) ¤Ç¤¢¤ê¡¢
¥ê¥¿¡¼¥ó»þ¤Ë¤Ï¡¢¾ï¤Ë
.I group
¤â´Þ¤á¤¿
.I user
¤¬½ê°¤¹¤ë¥°¥ë¡¼¥×¿ô¤¬³ÊǼ¤µ¤ì¤ë¡£
¤³¤ÎÃͤÏ
.I groups
¤Ë³ÊǼ¤µ¤ì¤¿¥°¥ë¡¼¥×¿ô¤è¤êÂ礭¤¯¤Ê¤ë²ÄǽÀ­¤¬¤¢¤ë¡£
.SH ÊÖ¤êÃÍ
.I user
¤¬½ê°¤·¤Æ¤¤¤ë¥°¥ë¡¼¥×¿ô¤¬
.I *ngroups
°Ê²¼¤Î¾ì¹ç¡¢
.I *ngroups
¤ÎÃͤ¬ÊÖ¤µ¤ì¤ë¡£

»ØÄꤵ¤ì¤¿¥æ¡¼¥¶¤¬
.I *ngroups
¤è¤ê¿¤¯¤Î¥°¥ë¡¼¥×¤Ë½ê°¤·¤Æ¤¤¤ë¾ì¹ç¡¢
.BR getgrouplist ()
¤Ï \-1 ¤òÊÖ¤¹¡£
¤³¤Î¾ì¹ç¡¢
.I *ngroups
¤ÇÊÖ¤µ¤ì¤ëÃͤò»È¤Ã¤Æ¡¢¥Ð¥Ã¥Õ¥¡¤Î¥µ¥¤¥º¤òÊѹ¹¤·¤Æ¤«¤é¡¢
.BR getgrouplist ()
¤ò¤â¤¦°ìÅٸƤӽФ¹¤³¤È¤¬¤Ç¤­¤ë¡£
.SH ¥Ð¡¼¥¸¥ç¥ó
¤³¤Î´Ø¿ô¤Ï glibc 2.2.4 ¤«¤é¸ºß¤¹¤ë¡£
.SH ½àµò
¤³¤Î´Ø¿ô¤ÏÈóɸ½à¤Ç¤¢¤ë¡£¤Û¤È¤ó¤É¤Î BSD ¤Ë¸ºß¤¹¤ë¡£
.SH ¥Ð¥°
¥Ð¡¼¥¸¥ç¥ó 2.3.3 ¤è¤êÁ°¤Î glibc ¤Ç¤Ï¡¢
¤³¤Î´Ø¿ô¤Î¼ÂÁõ¤Ë¤Ï¥Ð¥Ã¥Õ¥¡¥ª¡¼¥Ð¡¼¥Õ¥í¡¼¤Î¥Ð¥°¤¬¤¢¤ê¡¢
.I user
¤¬½ê°¤¹¤ë¥°¥ë¡¼¥×¿ô¤¬
.I *ngroups
¤è¤ê¿¤¤¾ì¹ç¤Ç¤¢¤Ã¤Æ¤â¡¢
.I user
¤¬½ê°¤¹¤ë¥°¥ë¡¼¥×¤ÎÁ´¥ê¥¹¥È¤òÇÛÎó
.I groups
¤Ë³ÊǼ¤·¤Æ¤·¤Þ¤¦¡£
.SH Îã
.PP
°Ê²¼¤Î¥×¥í¥°¥é¥à¤Ï¡¢°ì¤ÄÌܤΥ³¥Þ¥ó¥É¥é¥¤¥ó°ú¤­¿ô¤Ç»ØÄꤵ¤ì¤¿Ì¾Á°¤Î¥æ¡¼¥¶
¤¬½ê°¤¹¤ë¥°¥ë¡¼¥×¤Î¥ê¥¹¥È¤òɽ¼¨¤¹¤ë¡£
ÆóÈÖÌܤΥ³¥Þ¥ó¥É¥é¥¤¥ó°ú¤­¿ô¤Ë¤Ï¡¢
.BR getgrouplist ()
¤ËÅϤ¹
.I ngroups
¤ÎÃͤò»ØÄꤹ¤ë¡£
°Ê²¼¤Î¥·¥§¥ë¤Î¥»¥Ã¥·¥ç¥ó¤Ï¤³¤Î¥×¥í¥°¥é¥à¤Î»ÈÍÑÎã¤ò¼¨¤·¤¿¤â¤Î¤Ç¤¢¤ë¡£
.in +4n
.nf

.RB "$" " ./a.out cecilia 0"
getgrouplist() returned -1; ngroups = 3
.RB "$" " ./a.out cecilia 3"
ngroups = 3
16 (dialout)
33 (video)
100 (users)
.fi
.in
.SS ¥×¥í¥°¥é¥à¤Î¥½¡¼¥¹
\&
.nf
#include <stdio.h>
#include <stdlib.h>
#include <grp.h>
#include <pwd.h>

int
main(int argc, char *argv[])
{
    int j, ngroups;
    gid_t *groups;
    struct passwd *pw;
    struct group *gr;

    if (argc != 3) {
        fprintf(stderr, "Usage: %s <user> <ngroups>\\n", argv[0]);
        exit(EXIT_FAILURE);
    }

    ngroups = atoi(argv[2]);

    groups = malloc(ngroups * sizeof (gid_t));
    if (groups == NULL) {
        perror("malloc");
        exit(EXIT_FAILURE);
    }

    /* Fetch passwd structure (contains first group ID for user) */

    pw = getpwnam(argv[1]);
    if (pw == NULL) {
        perror("getpwnam");
        exit(EXIT_SUCCESS);
    }

    /* Retrieve group list */

    if (getgrouplist(argv[1], pw\->pw_gid, groups, &ngroups) == \-1) {
        fprintf(stderr, "getgrouplist() returned \-1; ngroups = %d\\n",
                ngroups);
        exit(EXIT_FAILURE);
    }

    /* Display list of retrieved groups, along with group names */

    fprintf(stderr, "ngroups = %d\\n", ngroups);
    for (j = 0; j < ngroups; j++) {
        printf("%d", groups[j]);
        gr = getgrgid(groups[j]);
        if (gr != NULL)
            printf(" (%s)", gr\->gr_name);
        printf("\\n");
    }

    exit(EXIT_SUCCESS);
}
.fi
.SH ´ØÏ¢¹àÌÜ
.BR getgroups (2),
.BR setgroups (2),
.BR getgrent (3),
.BR group (5),
.BR passwd (5)