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XrdSysFAttrMac.icc
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1/******************************************************************************/
2/* */
3/* X r d S y s F A t t r M a c . i c c */
4/* */
5/* (c) 2010 by the Board of Trustees of the Leland Stanford, Jr., University */
6/* All Rights Reserved */
7/* Produced by Andrew Hanushevsky for Stanford University under contract */
8/* DE-AC02-76-SFO0515 with the Department of Energy */
9/* */
10/* This file is part of the XRootD software suite. */
11/* */
12/* XRootD is free software: you can redistribute it and/or modify it under */
13/* the terms of the GNU Lesser General Public License as published by the */
14/* Free Software Foundation, either version 3 of the License, or (at your */
15/* option) any later version. */
16/* */
17/* XRootD is distributed in the hope that it will be useful, but WITHOUT */
18/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
19/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */
20/* License for more details. */
21/* */
22/* You should have received a copy of the GNU Lesser General Public License */
23/* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */
24/* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */
25/* */
26/* The copyright holder's institutional names and contributor's names may not */
27/* be used to endorse or promote products derived from this software without */
28/* specific prior written permission of the institution or contributor. */
29/******************************************************************************/
30
31#include <cerrno>
32#include <cstdio>
33#include <cstring>
34#include <unistd.h>
35#include <sys/types.h>
36#include <sys/xattr.h>
37
38#include "XrdSys/XrdSysError.hh"
39#include "XrdSys/XrdSysFAttr.hh"
40
41/******************************************************************************/
42/* X r d S y s F A t t r : : D e l */
43/******************************************************************************/
44
45int XrdSysFAttr::Del(const char *Aname, const char *Path, int fd)
46{
47 int ec;
48
49// Remove the attrbiute but ignore errors if it doesn't exist
50//
51 ec = (fd < 0 ? removexattr(Path,Aname,0) : fremovexattr(fd, Aname, 0));
52
53// Diagnose errors.
54//
55 if (ec) ec = Diagnose("remove", Aname, Path, errno);
56 return ec;
57}
58
59/******************************************************************************/
60/* X r d S y s F A t t r : : G e t */
61/******************************************************************************/
62
63int XrdSysFAttr::Get(const char *Aname, void *Aval, int Avsz,
64 const char *Path, int fd)
65{
66 int ec;
67
68// Obtain the attribute.
69//
70 ec = (fd < 0 ? getxattr(Path, Aname, Aval, Avsz, 0, 0)
71 : fgetxattr(fd, Aname, Aval, Avsz, 0, 0));
72
73// Diagnose errors.
74//
75 if (ec < 0) ec = Diagnose("get", Aname, Path, errno);
76 return ec;
77}
78
79/******************************************************************************/
80/* X r d S y s F A t t r : : L i s t */
81/******************************************************************************/
82
83int XrdSysFAttr::List(AList **aPL, const char *Path, int fd, int getSz)
84{
85 AList *aNew;
86 char *Buff, *bP, *bEnd;
87 int ec, Tlen, maxSz = 0, *msP = (getSz ? &maxSz : 0);
88
89// First obtain the amount of storage we will need for the whole list
90//
91 *aPL = 0;
92 Tlen = (fd < 0 ? listxattr(Path, 0, 0, 0) : flistxattr(fd, 0, 0, 0));
93 if (Tlen < 0)
94 {if ((ec = Diagnose("list", "*", Path, errno)) == -ENOATTR) ec = 0;
95 return ec;
96 }
97
98// If we don't have any then just return 0. Otherwise, add 4K to the buffer
99// size just in case some one is adding attributes while we get the list.
100//
101 if (!Tlen) return 0;
102 Tlen += 4096;
103
104// Allocate storage to get the whole list
105//
106 if (!(Buff = (char *)malloc(Tlen))) return -ENOMEM;
107
108// Now get the actual list. We will not recover if someone added an attribute
109// since the time we actual determined the size of the buffer we need.
110//
111 Tlen = (fd < 0 ? listxattr(Path,Buff,Tlen,0) : flistxattr(fd,Buff,Tlen,0));
112 if (Tlen < 0)
113 {if ((ec = Diagnose("list", "*", Path, errno)) == -ENOATTR) ec = 0;
114 free(Buff);
115 return ec;
116 }
117 if (!Tlen) return 0;
118
119// Run through the memory and allocate an AList entry for each.
120//
121 bP = Buff; bEnd = Buff+Tlen;
122 while(bP < bEnd)
123 {if ((aNew = getEnt(Path, fd, bP, *aPL, msP))) *aPL = aNew;
124 bP = bP + strlen(bP) + 1;
125 }
126
127// All done
128//
129 free(Buff);
130 return maxSz;
131}
132
133/******************************************************************************/
134/* X r d S y s F A t t r : : S e t */
135/******************************************************************************/
136
137int XrdSysFAttr::Set(const char *Aname, const void *Aval, int Avsz,
138 const char *Path, int fd, int isNew)
139{
140 int ec, xFlag = (isNew ? XATTR_CREATE : 0);
141
142// Set the attribute
143//
144 ec = (fd < 0 ? setxattr(Path, Aname, Aval, Avsz, 0, xFlag)
145 : fsetxattr(fd, Aname, Aval, Avsz, 0, xFlag));
146
147// Diagnose any errors
148//
149 if (ec < 0) ec = Diagnose("set", Aname, Path, errno);
150 return ec;
151}
#define ENOATTR
XrdOucString Path