XRootD
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XrdSysE2T.cc
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1/******************************************************************************/
2/* */
3/* X r d S y s E 2 T . c c */
4/* */
5/*(c) 2019 by the Board of Trustees of the Leland Stanford, Jr., University */
6/*Produced by Andrew Hanushevsky for Stanford University under contract */
7/* DE-AC02-76-SFO0515 with the Deprtment of Energy */
8/* */
9/* This file is part of the XRootD software suite. */
10/* */
11/* XRootD is free software: you can redistribute it and/or modify it under */
12/* the terms of the GNU Lesser General Public License as published by the */
13/* Free Software Foundation, either version 3 of the License, or (at your */
14/* option) any later version. */
15/* */
16/* XRootD is distributed in the hope that it will be useful, but WITHOUT */
17/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
18/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */
19/* License for more details. */
20/* */
21/* You should have received a copy of the GNU Lesser General Public License */
22/* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */
23/* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */
24/* */
25/* The copyright holder's institutional names and contributor's names may not */
26/* be used to endorse or promote products derived from this software without */
27/* specific prior written permission of the institution or contributor. */
28/******************************************************************************/
29
30#include <cstdio>
31#include <cstring>
32#include <map>
33#include <string>
34
36
37#ifdef __GNU__
38#define ERRNOBASE 0x40000000
39#else
40#define ERRNOBASE 0
41#endif
42
43namespace
44{
45static const int errSlots = 144;
46XrdSysMutex e2sMutex;
47std::map<int, std::string> e2sMap;
48 const char* Errno2String[errSlots] = {0};
49
50int initErrTable()
51{
52 char *eTxt, eBuff[80];
53 int lastGood = 0;
54
55// Premap all known error codes.
56//
57 for(int i = 1; i < errSlots; i++)
58 {eTxt = strerror(ERRNOBASE + i);
59 if (eTxt)
60 { eTxt = strdup(eTxt);
61 *eTxt = tolower(*eTxt);
62 Errno2String[i] = eTxt;
63 lastGood = i;
64 }
65 }
66 // NOTE: On systems without EAUTH (authentication error; currently all Glibc systems but GNU Hurd),
67 // EAUTH is remapped to EBADE ('invalid exchange'). Given there's no current XRootD use of a
68 // syscall that can return EBADE, we assume EBADE really means authentication denied.
69#if defined(EBADE)
70 if (EBADE - ERRNOBASE > 0 && EBADE - ERRNOBASE < errSlots) {
71 if (Errno2String[EBADE - ERRNOBASE])
72 free((char*)Errno2String[EBADE - ERRNOBASE]);
73 Errno2String[EBADE - ERRNOBASE] = "authentication failed - possible invalid exchange";
74 if (EBADE - ERRNOBASE > lastGood)
75 lastGood = EBADE - ERRNOBASE;
76 }
77 else {
78 e2sMap[EBADE] = "authentication failed - possible invalid exchange";
79 }
80#endif
81
82 // Supply generic message for missing ones
83 //
84 for (int i = 1; i < lastGood; i++)
85 {if (!Errno2String[i])
86 {snprintf(eBuff, sizeof(eBuff), "unknown error %d", ERRNOBASE + i);
87 Errno2String[i] = strdup(eBuff);
88 }
89 }
90
91// Return the highest valid one
92//
93 Errno2String[0] = "no error";
94 return lastGood;
95}
96
97int maxErrno = initErrTable();
98}
99
100/******************************************************************************/
101/* X r d S y s E 2 T */
102/******************************************************************************/
103
104const char *XrdSysE2T(int errcode)
105{
106 char eBuff[80];
107
108// Check if we can return this immediately
109//
110 if (errcode == 0) return Errno2String[0];
111 if (errcode > ERRNOBASE && errcode <= ERRNOBASE + maxErrno)
112 return Errno2String[errcode - ERRNOBASE];
113
114// If this is a negative value, then return a generic message
115//
116 if (errcode < 0) return "negative error";
117
118// Our errno registration wasn't sufficient, so check if it's already
119// registered and if not, register it.
120//
121 e2sMutex.Lock();
122 std::string &eTxt = e2sMap[errcode];
123 if (!eTxt.size())
124 {snprintf(eBuff, sizeof(eBuff), "unknown error %d", errcode);
125 eTxt = std::string(eBuff);
126 e2sMap[errcode] = eTxt;
127 }
128
129// Return the result
130//
131 e2sMutex.UnLock();
132 return eTxt.c_str();
133}
#define ERRNOBASE
Definition XrdSysE2T.cc:40
const char * XrdSysE2T(int errcode)
Definition XrdSysE2T.cc:104