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GETGROUPS
Section: Linux Programmer's Manual (2)Updated: 10 December 1997
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getgroups, setgroups - Êä½õ¥°¥ë¡¼¥× ID ¤Î¥ê¥¹¥È¤òÀßÄê/¼èÆÀ¤¹¤ë½ñ¼°
#include <sys/types.h>#include <unistd.h>
int getgroups(int size, gid_t list[]);
#include <grp.h>
int setgroups(size_t size, const gid_t *list);
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- getgroups
- ºÇÂç size ¤Þ¤Ç¤ÎÊä½õ¥°¥ë¡¼¥× (supplementary group) ID ¤ò list ¤ËÊÖ¤¹¡£ ¤³¤Î´Ø¿ô¤ò¸Æ¤Ó½Ð¤·¤¿¥×¥í¥»¥¹¤Î¼Â¸ú¥°¥ë¡¼¥× ID ¤¬¡¢ ÊÖ¤µ¤ì¤ë¥ê¥¹¥È¤Ë´Þ¤Þ¤ì¤ë¤«¤É¤¦¤«¤Ï»ØÄꤵ¤ì¤Æ¤¤¤Ê¤¤ (¤Ä¤Þ¤ê¡¢¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ï getegid(2) ¤ò¸Æ¤Ó½Ð¤·¡¢¤½¤Î·ë²Ì¤ÎÃͤòÄɲᦺï½ü¤¹¤Ù¤¤Ç¤¢¤ë)¡£ size ¤¬¥¼¥í¤Ê¤é¤Ð¡¢ list ¤Ï½¤Àµ¤µ¤ì¤Ê¤¤¤¬¡¢¤½¤Î¥×¥í¥»¥¹¤ÎÊä½õ¥°¥ë¡¼¥× ID ¤Î¹ç·×¿ô¤¬ÊÖ¤µ¤ì¤ë¡£
- setgroups
- ¤½¤Î¥×¥í¥»¥¹¤ËÊä½õ¥°¥ë¡¼¥× ID ¤òÀßÄꤹ¤ë¡£¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼¤Î¤ß¤¬ ¤³¤Î´Ø¿ô¤ò»ÈÍѤǤ¤ë¡£
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- getgroups
- À®¸ù¤·¤¿¾ì¹ç¤Ï¡¢Êä½õ¥°¥ë¡¼¥× ID ¤Î¿ô¤òÊÖ¤¹¡£ ¥¨¥é¡¼¤Î¾ì¹ç¤Ï -1 ¤òÊÖ¤· errno ¤¬Å¬ÀÚ¤ËÀßÄꤵ¤ì¤ë¡£
- setgroups
- À®¸ù¤·¤¿¾ì¹ç¤Ï¥¼¥í¤¬ÊÖ¤µ¤ì¤ë¡£¥¨¥é¡¼¤Ê¤é¤Ð -1 ¤¬ÊÖ¤µ¤ì¡¢ errno ¤¬Å¬ÀÚ¤ËÀßÄꤵ¤ì¤ë¡£
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- EFAULT
- list ¤¬ÉÔÀµ¤Ê¥¢¥É¥ì¥¹¤Ç¤¢¤ë¡£
- EPERM
- setgroups ¤Ç¡¢¥æ¡¼¥¶¡¼¤¬¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼¤Ç¤Ê¤¤¡£
- EINVAL
- setgroups ¤Ç¡¢ size ¤¬ NGROUPS (Linux 2.0.32 ¤Ç¤Ï 32) ¤è¤êÂ礤¤¡£ getgroups ¤Î¾ì¹ç size ¤¬Êä½õ¥°¥ë¡¼¥× ID ¤Î¿ô¤è¤ê¾®¤µ¤¤¤¬¥¼¥í¤Ç¤Ê¤¤¡£
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¥×¥í¥»¥¹¤Ï¡¢¼Â¸ú¥°¥ë¡¼¥× ID ¤Ë²Ã¤¨¡¢ºÇÂç NGROUPS_MAX ¤Þ¤Ç¤Î Êä½õ¥°¥ë¡¼¥× ID ¤ò»ý¤Ä¤³¤È¤¬¤Ç¤¤ë¡£ Êä½õ¥°¥ë¡¼¥× ID ¤Î¥»¥Ã¥È¤Ï¿Æ¥×¥í¥»¥¹¤«¤é·Ñ¾µ¤µ¤ì¤ë¤¬¡¢ setgroups ¤ò»È¤Ã¤ÆÊѹ¹¤Ç¤¤ë¡£ Êä½õ¥°¥ë¡¼¥× ID ¤ÎºÇÂç¿ô¤Ï sysconf(3) ¤ò»È¤Ã¤Æ°Ê²¼¤Î¤è¤¦¤Ë¤·¤ÆÄ´¤Ù¤ë¤³¤È¤¬¤Ç¤¤ë:
long ngroups_max;
ngroups_max = sysconf(_SC_NGROUPS_MAX);
getgroups
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setgroups ¤Î¥×¥í¥È¥¿¥¤¥×¤Ï _BSD_SOURCE ¤òÄêµÁ¤·¤¿¾ì¹ç¤Ë¤Î¤ß͸ú¤Ë¤Ê¤ë¡£ (ÌÀ¼¨Åª¤Ë¤â¤·¤¯¤Ï°ÅÌÛ¤Ë _POSIX_SOURCE ¤òÄêµÁ¤»¤º¡¢-ansi ¥Õ¥é¥°¤ò »ØÄꤷ¤Æ¥³¥ó¥Ñ¥¤¥ë¤·¤Ê¤±¤ì¤Ð _BSD_SOURCE ¤¬¼«Æ°Åª¤ËÄêµÁ¤µ¤ì¤ë)
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SVr4, SVID (4 ÈǤΤß; SVr3 ¤Ë¤Ï¤³¤ì¤é¤Î¥³¡¼¥ë¤Ï¸ºß¤·¤Ê¤¤), X/OPEN, 4.3BSD¡£ getgroups ´Ø¿ô¤Ï POSIX.1 ¤Ë½àµò¤·¤Æ¤¤¤ë¡£ setgroups ¤ÏÆø¢¤òɬÍפȤ¹¤ë¤¿¤á¡¢POSIX.1 ¤Ë½¾¤Ã¤Æ¤¤¤Ê¤¤¡£´ØÏ¢¹àÌÜ
initgroups(3), getgid(2), setgid(2)