1explain_rmdir(3) Library Functions Manual explain_rmdir(3)
2
6 explain_rmdir - explain rmdir(2) errors
7
9 #include <libexplain/rmdir.h>
10 const char *explain_rmdir(const char *pathname);
11 const char *explain_errno_rmdir(int errnum, const char pathname);
12 void explain_message_rmdir(char *message, int message_size, const char
13 *pathname);
14 void explain_message_errno_rmdir(char *message, int message_size, int
15 errnum, const char *pathname);
16
18 These functions may be used to obtain explanations for errors returned
19 by the rmdir(2) system call.
20 explain_rmdir
22 const char *explain_rmdir(const char *pathname);
23 The explain_rmdir function may be used to describe errors returned by
25 the rmdir() system call. The least the message will contain is the
26 value of strerror(errno), but usually it will do much better, and indi‐
27 cate 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 (rmdir(pathname) < 0)
35 {
36 fprintf(stderr, "%s\n", explain_rmdir(pathname));
37 exit(EXIT_FAILURE);
38 }
39 pathname
41 The original pathname, exactly as passed to the rmdir(2) system
42 call.
43 Returns:
45 The message explaining the error. This message buffer is
46 shared by all libexplain functions which do not supply a buffer
47 in their argument list. This will be overwritten by the next
48 call to any libexplain function which shares this buffer,
49 including other threads.
50 Note: This function is not thread safe, because it shares a return buf‐
52 fer across all threads, and many other functions in this library.
53 explain_errno_rmdir
55 const char *explain_errno_rmdir(int errnum, const char *pathname);
56 The explain_errno_rmdir function may be used to describe errors
58 returned by the rmdir() system call. The least the message will con‐
59 tain is the value of strerror(errnum), but usually it will do much bet‐
60 ter, and indicate the underlying cause in more detail.
61 This function is intended to be used in a fashion similar to the fol‐
63 lowing example:
64 if (rmdir(pathname) < 0)
65 {
66 int err = errno;
67 fprintf(stderr, "%s\n", explain_rmdir(err, pathname));
68 exit(EXIT_FAILURE);
69 }
70 errnum The error value to be decoded, usually obtained from the errno
72 global variable just before this function is called. This is
73 necessary if you need to call any code between the system call
74 to be explained and this function, because many libc functions
75 will alter the value of errno.
76 pathname
78 The original pathname, exactly as passed to the rmdir(2) system
79 call.
80 Returns:
82 The message explaining the error. This message buffer is
83 shared by all libexplain functions which do not supply a buffer
84 in their argument list. This will be overwritten by the next
85 call to any libexplain function which shares this buffer,
86 including other threads.
87 Note: This function is not thread safe, because it shares a return buf‐
89 fer across all threads, and many other functions in this library.
90 explain_message_rmdir
92 void explain_message_rmdir(char *message, int message_size, const char
93 *pathname);
94 The explain_message_rmdir function may be used to describe errors
96 returned by the rmdir() system call. The least the message will con‐
97 tain is the value of strerror(errno), but usually it will do much bet‐
98 ter, and indicate the underlying cause in more detail.
99 The errno global variable will be used to obtain the error value to be
101 decoded.
102 This function is intended to be used in a fashion similar to the fol‐
104 lowing example:
105 if (rmdir(pathname) < 0)
106 {
107 char message[3000];
108 explain_message_rmdir(message, sizeof(message), pathname);
109 fprintf(stderr, "%s\n", message);
110 exit(EXIT_FAILURE);
111 }
112 message The location in which to store the returned message. If a
114 suitable message return buffer is supplied, this function is
115 thread safe.
116 message_size
118 The size in bytes of the location in which to store the
119 returned message.
120 pathname
122 The original pathname, exactly as passed to the rmdir(2) system
123 call.
124 explain_message_errno_rmdir
126 void explain_message_errno_rmdir(char *message, int message_size, int
127 errnum, const char *pathname);
128 The explain_message_errno_rmdir function may be used to describe errors
130 returned by the rmdir() system call. The least the message will con‐
131 tain is the value of strerror(errnum), but usually it will do much bet‐
132 ter, and indicate the underlying cause in more detail.
133 This function is intended to be used in a fashion similar to the fol‐
135 lowing example:
136 if (rmdir(pathname) < 0)
137 {
138 int err = errno;
139 char message[3000];
140 explain_message_errno_rmdir(message, sizeof(message), err, pathname);
141 fprintf(stderr, "%s\n", message);
142 exit(EXIT_FAILURE);
143 }
144 message The location in which to store the returned message. If a
146 suitable message return buffer is supplied, this function is
147 thread safe.
148 message_size
150 The size in bytes of the location in which to store the
151 returned message.
152 errnum The error value to be decoded, usually obtained from the errno
154 global variable just before this function is called. This is
155 necessary if you need to call any code between the system call
156 to be explained and this function, because many libc functions
157 will alter the value of errno.
158 pathname
160 The original pathname, exactly as passed to the rmdir(2) system
161 call.
162
164 rmdir delete a directory
165 explain_rmdir_or_die
167 delete a directory and report errors
168
170 libexplain version 0.40
171 Copyright (C) 2008 Peter Miller
172 explain_rmdir(3)