1explain_closedir(3) Library Functions Manual explain_closedir(3)
2
6 explain_closedir - explain closedir(3) errors
7
9 #include <libexplain/closedir.h>
10 const char *explain_closedir(DIR *dir);
11 const char *explain_errno_closedir(int errnum, DIR *dir);
12 void explain_message_closedir(char *message, int message_size, DIR
13 *dir);
14 void explain_message_errno_closedir(char *message, int message_size,
15 int errnum, DIR *dir);
16
18 These functions may be used to obtain explanations for errors returned
19 by the closedir(3) system call.
20 explain_closedir
22 const char *explain_closedir(DIR *dir);
23 The explain_closedir function is used to obtain an explanation of an
25 error returned by the closedir(3) system call. The least the message
26 will contain is the value of strerror(errno), but usually it will do
27 much better, and indicate the underlying cause in more detail.
28 The errno global variable will be used to obtain the error value to be
30 decoded.
31 This function is intended to be used in a fashion similar to the fol‐
33 lowing example:
34 if (closedir(dir) < 0)
35 {
36 fprintf(stderr, "%s\n", explain_closedir(dir));
37 exit(EXIT_FAILURE);
38 }
39 dir The original dir, exactly as passed to the closedir(3) system
41 call.
42 Returns:
44 The message explaining the error. This message buffer is
45 shared by all libexplain functions which do not supply a buffer
46 in their argument list. This will be overwritten by the next
47 call to any libexplain function which shares this buffer,
48 including other threads.
49 Note: This function is not thread safe, because it shares a return buf‐
51 fer across all threads, and many other functions in this library.
52 explain_errno_closedir
54 const char *explain_errno_closedir(int errnum, DIR *dir);
55 The explain_errno_closedir function is used to obtain an explanation of
57 an error returned by the closedir(3) system call. The least the mes‐
58 sage will contain is the value of strerror(errnum), but usually it will
59 do much better, and indicate the underlying cause in more detail.
60 This function is intended to be used in a fashion similar to the fol‐
62 lowing example:
63 if (closedir(dir) < 0)
64 {
65 int err = errno;
66 fprintf(stderr, "%s\n", explain_errno_closedir(err, dir));
67 exit(EXIT_FAILURE);
68 }
69 errnum The error value to be decoded, usually obtained from the errno
71 global variable just before this function is called. This is
72 necessary if you need to call any code between the system call
73 to be explained and this function, because many libc functions
74 will alter the value of errno.
75 dir The original dir, exactly as passed to the closedir(3) system
77 call.
78 Returns:
80 The message explaining the error. This message buffer is
81 shared by all libexplain functions which do not supply a buffer
82 in their argument list. This will be overwritten by the next
83 call to any libexplain function which shares this buffer,
84 including other threads.
85 Note: This function is not thread safe, because it shares a return buf‐
87 fer across all threads, and many other functions in this library.
88 explain_message_closedir
90 void explain_message_closedir(char *message, int message_size, DIR
91 *dir);
92 The explain_message_closedir function may be used to obtain an expla‐
94 nation of an error returned by the closedir(3) system call. The least
95 the message will contain is the value of strerror(errno), but usually
96 it will do much better, and indicate the underlying cause in more
97 detail.
98 The errno global variable will be used to obtain the error value to be
100 decoded.
101 This function is intended to be used in a fashion similar to the fol‐
103 lowing example:
104 if (closedir(dir) < 0)
105 {
106 char message[3000];
107 explain_message_closedir(message, sizeof(message), dir);
108 fprintf(stderr, "%s\n", message);
109 exit(EXIT_FAILURE);
110 }
111 message The location in which to store the returned message. If a
113 suitable message return buffer is supplied, this function is
114 thread safe.
115 message_size
117 The size in bytes of the location in which to store the
118 returned message.
119 dir The original dir, exactly as passed to the closedir(3) system
121 call.
122 explain_message_errno_closedir
124 void explain_message_errno_closedir(char *message, int message_size,
125 int errnum, DIR *dir);
126 The explain_message_errno_closedir function may be used to obtain an
128 explanation of an error returned by the closedir(3) system call. The
129 least the message will contain is the value of strerror(errnum), but
130 usually it will do much better, and indicate the underlying cause in
131 more detail.
132 This function is intended to be used in a fashion similar to the fol‐
134 lowing example:
135 if (closedir(dir) < 0)
136 {
137 int err = errno;
138 char message[3000];
139 explain_message_errno_closedir(message, sizeof(message), err, dir);
140 fprintf(stderr, "%s\n", message);
141 exit(EXIT_FAILURE);
142 }
143 message The location in which to store the returned message. If a
145 suitable message return buffer is supplied, this function is
146 thread safe.
147 message_size
149 The size in bytes of the location in which to store the
150 returned message.
151 errnum The error value to be decoded, usually obtained from the errno
153 global variable just before this function is called. This is
154 necessary if you need to call any code between the system call
155 to be explained and this function, because many libc functions
156 will alter the value of errno.
157 dir The original dir, exactly as passed to the closedir(3) system
159 call.
160
162 closedir(3)
163 close a directory
164 explain_closedir_or_die(3)
166 close a directory and report errors
167
169 libexplain version 0.40
170 Copyright (C) 2008 Peter Miller
171 explain_closedir(3)