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chmod, fchmod, lchmod — ?ե??????Υ⡼?ɤ??ѹ?????

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Standard C Library (libc, -lc)

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<sys/stat.h> int chmod(const char *path, mode_t mode) int fchmod(int fd, mode_t mode) int lchmod(const char *path, mode_t mode)

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path ?ǻ??ꤵ???뤫???ޤ??ϥե????뵭?һ? fd ?ǻ??Ȥ??????ե??????? ?ե????????ĥӥåȤ? mode ???ѹ????ޤ??? chmod() ?????ƥॳ?????ϡ??ץ???????ͭ?? (?桼??) ?? path (?ޤ??? fd) ?ǻ??ꤵ?줿?ե?????????ͭ???뤫???ޤ??ϥ????ѥ桼???? ???뤫?Τɤ??餫?Ǥ??뤳?Ȥ???ǧ???ޤ??? chmod() ?????ƥॳ?????ϡ??????ܥ??å????󥯤򤿤ɤꡢ ???󥯼??ΤǤϤʤ????󥯤Υ??????åȤ˺??Ѥ??ޤ???

lchmod() ?????ƥॳ?????? chmod() ?????????Ƥ??ޤ??????????ܥ??å????󥯤򤿤ɤ??ޤ?????

?⡼?ɤ? <sys/stat.h> ?????????줿???ĥӥåȥޥ??????????? (or) ?????????????ޤ?:

#define S_IRWXU 0000700    /* ??ͭ???Ѥ? RWX ?ޥ??? */
#define S_IRUSR 0000400    /* ??ͭ???Ѥ? R */
#define S_IWUSR 0000200    /* ??ͭ???Ѥ? W */
#define S_IXUSR 0000100    /* ??ͭ???Ѥ? X */

#define S_IRWXG 0000070    /* ???롼???Ѥ? RWX ?ޥ??? */
#define S_IRGRP 0000040    /* ???롼???Ѥ? R */
#define S_IWGRP 0000020    /* ???롼???Ѥ? W */
#define S_IXGRP 0000010    /* ???롼???Ѥ? X */

#define S_IRWXO 0000007    /* ????¾?Ѥ? RWX ?ޥ??? */
#define S_IROTH 0000004    /* ????¾?Ѥ? R */
#define S_IWOTH 0000002    /* ????¾?Ѥ? W */
#define S_IXOTH 0000001    /* ????¾?Ѥ? X */

#define S_ISUID 0004000    /* ?¹Ի??˥桼?? ID ?????? */
#define S_ISGID 0002000    /* ?¹Ի??˥??롼?? ID ?????? */
#define S_ISVTX 0001000    /* ???ƥ??å??ӥå? */
#ifndef __BSD_VISIBLE
#define S_ISTXT 0001000    /* ???ƥ??å??ӥå? */
#endif

FreeBSD VM ?????ƥ??ϡ??¹Բ?ǽ?⥸?塼???ˤĤ??ƥ??ƥ??å??ӥå? (ISTXT) ????????̵?뤷?ޤ??? UFS ???١????Ȥ????ե????륷???ƥ? (FFS, LFS) ?Ǥϡ? ???ƥ??å??ӥåȤϥǥ??쥯?ȥ??ˤ????????Ǥ??ޤ???

ISTXT (`???ƥ??å??ӥå?') ?????ꤵ???Ƥ????ǥ??쥯?ȥ??Ǥϡ? ?ø??Τʤ??桼???ϡ????Υǥ??쥯?ȥ????ˤ???¾?桼???Υե??????κ????? ̾?????ѹ????Ǥ??ޤ????? ?ɤΥ桼???Ǥ⡢???Υ桼??????ͭ???뤫Ŭ?ڤʵ??ĤΤ????ǥ??쥯?ȥ??ˤĤ??? ???ƥ??å??ӥåȤ??????Ǥ??ޤ??? ???ƥ??å??ӥåȤ??????ξܺ٤ˤĤ??Ƥϡ? sticky(8) ?򻲾Ȥ??Ƥ?????????

?????ǥ??쥯?ȥ??? ISUID (?桼?? ID ?????ӥå?) ?????ꤵ???Ƥ??ꡢ ???ĥե????륷???ƥ????ޥ????Ȥ????ݤ? MNT_SUIDDIR ???ץ??????? ???ꤵ???Ƥ??????硢 ???Υǥ??쥯?ȥ????˺????????뿷?????ե??????ȥ??֥ǥ??쥯?ȥ??ν?ͭ?Ԥϡ? ?ǥ??쥯?ȥ??ν?ͭ?Ԥ????ꤵ???ޤ??? ???ε?ǽ??ͭ???Ǥ????Ȥ??????????ǥ??쥯?ȥ??ϿƤ??? ISUID ?ӥåȤ??Ѿ????ޤ??? ?¹ԥӥåȤϥե????뤫???????????졢?ե??????? root ?ν?ͭ?ȤϤʤ??ޤ????? ???ε?ǽ?ϡ??ե??????ؤν????ߤ??桼???˵??Ĥ????????????ѹ????ޤ????? ?ե????뤬???????줿???κǽ?Ū?ʽ?ͭ?Ԥη????˱ƶ??????ΤߤǤ??? ???롼?פϷѾ??????ޤ?????

???ε?ǽ?ϡ?ftp??SAMBA ?ޤ??? netatalk ??ͳ?? PC ?桼???ؤ? ?ե????륵???ӥ??ǻ??Ѥ??????褦?߷פ????Ƥ??ޤ??? ?????ϥ??????桼???˥????????ƥ??ۡ??????󶡤????Τǡ? ?äˡ??ۡ????ǥ??쥯?ȥ??Ǥϻ??Ѥ??ƤϤʤ??ޤ????? ???Υ??ץ????󤬵?ǽ???뤿???ˤϡ? ?????ͥ????? SUIDDIR ???ץ???????ɬ?פǤ??? UFS ?ե????륷???ƥ??????????Υ??ץ??????򥵥ݡ??Ȥ??ޤ??? suiddir ?ޥ????ȥ??ץ??????ξܺ٤ˤĤ??Ƥϡ? mount(8) ?򻲾Ȥ??Ƥ?????????

?????ѥ桼???ʳ??Υ桼???ˤ??롢 ?ե??????ν????ߤޤ??ϥե??????ν?ͭ?Ԥ??ѹ??ˤ??äƥ桼?? ID ?????ӥåȤ? ???롼?? ID ?????ӥåȤϥ??դ??ڤ??ؤ??????ޤ??? ?ߴ????ϵ????ˤʤ??ޤ????? ?桼?? ID ???? (???롼?? ID ????) ?ӥåȤ??Ĥ????ޤ? ?ե????뤬?ѹ????????Τ??ɤ????Ȥǡ? ?????ƥ??Ϥ????餫?????ˤʤ??ޤ???

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Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

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chmod() ?????ƥॳ?????ϡ????ξ????˽????˼??Ԥ??ե??????⡼?ɤ??ѹ??????ޤ???:

[ENOTDIR]

?ѥ??ι??????????˥ǥ??쥯?ȥ??ʳ??Τ??Τ??ޤޤ??Ƥ??ޤ???

[ENAMETOOLONG]

?ѥ?̾?ι??????Ǥ? 255 ʸ?????ۤ??Ƥ??뤫?? ?ޤ??ϥѥ?̾???Τ? 1023 ʸ?????ۤ??Ƥ??ޤ???

[ENOENT]

???ꤵ?줿?ե????뤬¸?ߤ??ޤ?????

[EACCES]

???ꤵ?줿?ѥ??ˤϡ??????????Ĥ????Ƥ??ʤ??ǥ??쥯?ȥ꤬?ޤޤ??Ƥ??ޤ???

[ELOOP]

?ѥ?̾???Ѵ??????Ȥ??˸??Ф??줿?????ܥ??å????󥯤?¿?????ޤ???

[EPERM]

?¸??桼?? ID ???ե??????ν?ͭ?ԤȰ??פ????? ?¸??桼?? ID ???????ѥ桼???ǤϤ????ޤ?????

[EROFS]

???ꤵ?줿?ե????????ɼ??????ѥե????륷???ƥ????ˤ????ޤ???

[EFAULT]

path ?????????ץ??????˳??????Ƥ??줿???ɥ쥹???֤??ϰϳ????ؤ??Ƥ??ޤ???

[EIO]

?ե????륷???ƥ????ɤ߽񤭤??Ƥ????֤??????ϥ??顼??ȯ?????ޤ?????

[EFTYPE]

?¹Բ?ǽ?⥸?塼?????ǥ??ƥ??å??ӥåȤ????ꤷ?褦?Ȥ??ޤ?????

fchmod() ?????ƥॳ?????ϡ????ξ????˽????????Ԥ??ޤ?:

[EBADF]

???һҤ?ͭ???ǤϤ????ޤ?????

[EINVAL]

fd ???????ե??????ǤϤʤ??????åȤ򻲾Ȥ??Ƥ??ޤ???

[EROFS]

?ե????뤬?ɼ??????ѤΥե????륷???ƥ??????֤????Ƥ??ޤ???

[EIO]

?ե????륷???ƥ????ɤ߽񤭤??Ƥ????֤??????ϥ??顼??ȯ?????ޤ?????

??Ϣ????

chmod(1), chown(2), open(2), stat(2), sticky(8)

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chmod() ?????ƥॳ?????? EFTYPE ???֤????뤳?Ȥ? S_ISTXT ?λ???ˡ???????? IEEE Std 1003.1-1990 (“POSIX.1”) ??Ŭ?礷?Ƥ??ޤ???

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chmod() ?????ƥॳ?????? Version 7 AT&T UNIX ???о줷?ޤ????? fchmod() ?????ƥॳ?????? 4.2BSD ???о줷?ޤ????? lchmod() ?????ƥॳ?????? FreeBSD 3.0 ???о줷?ޤ?????