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1 | .\" |
2 | .\" Extended attributes system calls manual pages | |
3 | .\" | |
bf5a7247 MK |
4 | .\" Copyright (C) Andreas Gruenbacher, February 2001 |
5 | .\" Copyright (C) Silicon Graphics Inc, September 2001 | |
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6 | .\" |
7 | .\" This is free documentation; you can redistribute it and/or | |
8 | .\" modify it under the terms of the GNU General Public License as | |
9 | .\" published by the Free Software Foundation; either version 2 of | |
10 | .\" the License, or (at your option) any later version. | |
11 | .\" | |
12 | .\" The GNU General Public License's references to "object code" | |
13 | .\" and "executables" are to be interpreted as the output of any | |
14 | .\" document formatting or typesetting system, including | |
15 | .\" intermediate and printed output. | |
16 | .\" | |
17 | .\" This manual is distributed in the hope that it will be useful, | |
18 | .\" but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | .\" GNU General Public License for more details. | |
21 | .\" | |
22 | .\" You should have received a copy of the GNU General Public | |
23 | .\" License along with this manual; if not, write to the Free | |
24 | .\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, | |
25 | .\" USA. | |
26 | .\" | |
2965fbf1 | 27 | .TH SETXATTR 2 2013-01-19 "Linux" "Linux Programmer's Manual" |
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28 | .SH NAME |
29 | setxattr, lsetxattr, fsetxattr \- set an extended attribute value | |
30 | .SH SYNOPSIS | |
31 | .fam C | |
32 | .nf | |
33 | .B #include <sys/types.h> | |
34 | .B #include <attr/xattr.h> | |
35 | .sp | |
c10859eb MK |
36 | .BI "int setxattr(const char\ *" path ", const char\ *" name , |
37 | .BI " const void\ *" value ", size_t " size ", int " flags ); | |
38 | .BI "int lsetxattr(const char\ *" path ", const char\ *" name , | |
39 | .BI " const void\ *" value ", size_t " size ", int " flags ); | |
d3b03141 | 40 | .BI "int fsetxattr(int " fd ", const char\ *" name , |
c10859eb | 41 | .BI " const void\ *" value ", size_t " size ", int " flags ); |
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42 | .fi |
43 | .fam T | |
44 | .SH DESCRIPTION | |
45 | Extended attributes are | |
46 | .IR name :\c | |
47 | .I value | |
0967c11f | 48 | pairs associated with inodes (files, directories, symbolic links, etc.). |
fea681da | 49 | They are extensions to the normal attributes which are associated |
75b94dc3 | 50 | with all inodes in the system (i.e., the |
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51 | .BR stat (2) |
52 | data). | |
53 | A complete overview of extended attributes concepts can be found in | |
54 | .BR attr (5). | |
55 | .PP | |
e511ffb6 | 56 | .BR setxattr () |
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57 | sets the |
58 | .I value | |
59 | of the extended attribute identified by | |
60 | .I name | |
61 | and associated with the given | |
62 | .I path | |
24d01c53 | 63 | in the file system. |
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64 | The |
65 | .I size | |
66 | of the | |
67 | .I value | |
68 | must be specified. | |
69 | .PP | |
e511ffb6 | 70 | .BR lsetxattr () |
c13182ef | 71 | is identical to |
e511ffb6 | 72 | .BR setxattr (), |
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73 | except in the case of a symbolic link, where the extended attribute is |
74 | set on the link itself, not the file that it refers to. | |
75 | .PP | |
e511ffb6 | 76 | .BR fsetxattr () |
fea681da | 77 | is identical to |
e511ffb6 | 78 | .BR setxattr (), |
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79 | only the extended attribute is set on the open file referred to by |
80 | .I fd | |
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81 | (as returned by |
82 | .BR open (2)) | |
83 | in place of | |
84 | .IR path . | |
85 | .PP | |
836f07c1 | 86 | An extended attribute name is a simple null-terminated string. |
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87 | The |
88 | .I name | |
df8a3cac | 89 | includes a namespace prefix; there may be several, disjoint |
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90 | namespaces associated with an individual inode. |
91 | The | |
92 | .I value | |
93 | of an extended attribute is a chunk of arbitrary textual or | |
94 | binary data of specified length. | |
95 | .PP | |
96 | The | |
97 | .I flags | |
c4bb193f | 98 | argument can be used to refine the semantics of the operation. |
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99 | .B XATTR_CREATE |
100 | specifies a pure create, which fails if the named | |
fea681da | 101 | attribute exists already. |
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102 | .B XATTR_REPLACE |
103 | specifies a pure replace operation, which fails if the | |
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104 | named attribute does not already exist. |
105 | By default (no flags), the extended attribute will be created if | |
106 | need be, or will simply replace the value if the attribute exists. | |
107 | .SH RETURN VALUE | |
108 | On success, zero is returned. | |
109 | On failure, \-1 is returned and | |
110 | .I errno | |
111 | is set appropriately. | |
112 | .PP | |
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113 | If |
114 | .B XATTR_CREATE | |
115 | is specified, and the attribute exists already, | |
fea681da | 116 | .I errno |
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117 | is set to |
118 | .BR EEXIST . | |
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119 | If |
120 | .B XATTR_REPLACE | |
121 | is specified, and the attribute does not exist, | |
fea681da | 122 | .I errno |
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123 | is set to |
124 | .BR ENOATTR . | |
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125 | .RB ( ENOATTR |
126 | is defined to be a synonym for | |
127 | .BR ENODATA | |
128 | in | |
129 | .IR <attr/xattr.h> .) | |
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130 | .PP |
131 | If there is insufficient space remaining to store the extended attribute, | |
132 | .I errno | |
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133 | is set to either |
134 | .BR ENOSPC , | |
135 | or | |
0daa9e92 | 136 | .B EDQUOT |
2f0af33b | 137 | if quota enforcement was the cause. |
fea681da | 138 | .PP |
24d01c53 | 139 | If extended attributes are not supported by the file system, or are disabled, |
fea681da | 140 | .I errno |
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141 | is set to |
142 | .BR ENOTSUP . | |
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143 | .PP |
144 | The errors documented for the | |
145 | .BR stat (2) | |
146 | system call are also applicable here. | |
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147 | .SH VERSIONS |
148 | These system calls have been available on Linux since kernel 2.4; | |
149 | glibc support is provided since version 2.3. | |
9d9dc1e8 | 150 | .SH "CONFORMING TO" |
8382f16d | 151 | These system calls are Linux-specific. |
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152 | .\" .SH AUTHORS |
153 | .\" Andreas Gruenbacher, | |
154 | .\" .RI < a.gruenbacher@computer.org > | |
155 | .\" and the SGI XFS development team, | |
156 | .\" .RI < linux-xfs@oss.sgi.com >. | |
157 | .\" Please send any bug reports or comments to these addresses. | |
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158 | .SH SEE ALSO |
159 | .BR getfattr (1), | |
160 | .BR setfattr (1), | |
161 | .BR getxattr (2), | |
162 | .BR listxattr (2), | |
163 | .BR open (2), | |
164 | .BR removexattr (2), | |
165 | .BR stat (2), | |
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166 | .BR attr (5), |
167 | .BR symlink (7) |