C エラー - 版の履歴

2020年2月16日 (日) 04:22にPirotoによる

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2020年2月15日 (土) 08:01にPirotoによる

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Piroto: ページの作成:「==C エラー== [Programming C] system callが失敗すると、外部変数 errno に設定する。 errnoの値は該当する関数を呼び出した直後に調…」

2020-02-15T07:30:44Z

ページの作成:「==C エラー== [Programming C] *system callが失敗すると、外部変数 errno に設定する。 *errnoの値は該当する関数を呼び出した直後に調…」

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==C エラー==
[Programming C]
*system callが失敗すると、外部変数 errno に設定する。
*errnoの値は該当する関数を呼び出した直後に調べる必要がある。
*値と意味は、error.hに記述されている。

{|class="wikitable"
!値
!意味
|-
|EPERM
|操作は許可されない
|-
|ENOENT
|該当するfileまたはdirectoryが存在しない
|-
|EINTR
|system callが割り込まれた
|-
|EIO
|I/O error
|-
|EBUSY
|deviceまたはresourceが使用中
|-
|EEXIST
|fileが存在する
|-
|EINVAL
|引数が無効
|-
|EMFILE
|openされているfileが多すぎる
|-
|ENODEV
|該当するdeviceが存在しない
|-
|EISDIR
|directoryである
|-
|ENOTDIR
|direcotryではない
|-
|}

===strerror===
#include <string.h>
char *strerror(int errnum);
*指定されたerror番号のerrorの種類を説明する文字列を返す。

===perror===
#include <stdio.h>
void perror(const char *s);
*errnoが示す現在のerrorの種類を説明する文字列を標準error出力に出力する。
*文字列sがNULLでなければ、sで指定された文字列に続いて、: と空白を出力してから、error種類をあらわす文字列を出力する。
----
#include <string.h>
#include <error.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
char *buf;
buf = (char *)malloc(sizeof(char) * 256);
for (i=0; i<256; i++) {
buf = strerror(i);
printf("%d : %s\n", i,buf);
}
free(buf);
}

0 : Success
1 : Operation not permitted
2 : No such file or directory
3 : No such process
4 : Interrupted system call
5 : Input/output error
6 : No such device or address
7 : Argument list too long
8 : Exec format error
9 : Bad file descriptor
10 : No child processes
11 : Resource temporarily unavailable
12 : Cannot allocate memory
13 : Permission denied
14 : Bad address
15 : Block device required
16 : Device or resource busy
17 : File exists
18 : Invalid cross-device link
19 : No such device
20 : Not a directory
21 : Is a directory
22 : Invalid argument
23 : Too many open files in system
24 : Too many open files
25 : Inappropriate ioctl for device
26 : Text file busy
27 : File too large
28 : No space left on device
29 : Illegal seek
30 : Read-only file system
31 : Too many links
32 : Broken pipe
33 : Numerical argument out of domain
34 : Numerical result out of range
35 : Resource deadlock avoided
36 : File name too long
37 : No locks available
38 : Function not implemented
39 : Directory not empty
40 : Too many levels of symbolic links
41 : Unknown error 41
42 : No message of desired type
43 : Identifier removed
44 : Channel number out of range
45 : Level 2 not synchronized
46 : Level 3 halted
47 : Level 3 reset
48 : Link number out of range
49 : Protocol driver not attached
50 : No CSI structure available
51 : Level 2 halted
52 : Invalid exchange
53 : Invalid request descriptor
54 : Exchange full
55 : No anode
56 : Invalid request code
57 : Invalid slot
58 : Unknown error 58
59 : Bad font file format
60 : Device not a stream
61 : No data available
62 : Timer expired
63 : Out of streams resources
64 : Machine is not on the network
65 : Package not installed
66 : Object is remote
67 : Link has been severed
68 : Advertise error
69 : Srmount error
70 : Communication error on send
71 : Protocol error
72 : Multihop attempted
73 : RFS specific error
74 : Bad message
75 : Value too large for defined data type
76 : Name not unique on network
77 : File descriptor in bad state
78 : Remote address changed
79 : Can not access a needed shared library
80 : Accessing a corrupted shared library
81 : .lib section in a.out corrupted
82 : Attempting to link in too many shared libraries
83 : Cannot exec a shared library directly
84 : Invalid or incomplete multibyte or wide character
85 : Interrupted system call should be restarted
86 : Streams pipe error
87 : Too many users
88 : Socket operation on non-socket
89 : Destination address required
90 : Message too long
91 : Protocol wrong type for socket
92 : Protocol not available
93 : Protocol not supported
94 : Socket type not supported
95 : Operation not supported
96 : Protocol family not supported
97 : Address family not supported by protocol
98 : Address already in use
99 : Cannot assign requested address
100 : Network is down
101 : Network is unreachable
102 : Network dropped connection on reset
103 : Software caused connection abort
104 : Connection reset by peer
105 : No buffer space available
106 : Transport endpoint is already connected
107 : Transport endpoint is not connected
108 : Cannot send after transport endpoint shutdown
109 : Too many references: cannot splice
110 : Connection timed out
111 : Connection refused
112 : Host is down
113 : No route to host
114 : Operation already in progress
115 : Operation now in progress
116 : Stale NFS file handle
117 : Structure needs cleaning
118 : Not a XENIX named type file
119 : No XENIX semaphores available
120 : Is a named type file
121 : Remote I/O error
122 : Disk quota exceeded
123 : No medium found
124 : Wrong medium type
125 : Operation canceled
126 : Required key not available
127 : Key has expired
128 : Key has been revoked
129 : Key was rejected by service
130 : Owner died
131 : State not recoverable

----
この本からの覚書。
{{amazon|4797327014}}

@@ 1行目: / 1行目: @@
-==C エラー==
+==[[C エラー]]==
 [[Programming C]] |
 *system callが失敗すると、外部変数 errno に設定する。
@@ 9行目: / 9行目: @@
 !意味
 |-
-|EPERM
+|EPE[[R]]M
 |操作は許可されない
 |-
@@ 15行目: / 15行目: @@
 |該当するfileまたはdirectoryが存在しない
 |-
-|EINTR
+|EINT[[R]]
 |system callが割り込まれた
 |-
@@ 22行目: / 22行目: @@
 |-
 |EBUSY
-|deviceまたはresourceが使用中
+|de[[vi]]ceまたはresourceが使用中
 |-
 |EEXIST
@@ 34行目: / 34行目: @@
 |-
 |ENODEV
-|該当するdeviceが存在しない
+|該当するde[[vi]]ceが存在しない
 |-
-|EISDIR
+|EISDI[[R]]
 |directoryである
 |-
-|ENOTDIR
+|ENOTDI[[R]]
 |direcotryではない
 |-
@@ 77行目: / 77行目: @@
 : Interrupted system call
 : Input/output error
-: No such device or address
+: No such de[[vi]]ce or address
 : Argument list too long
 : Exec format error
 : Bad file descriptor
 : No child processes
-: Resource temporarily unavailable
+: [[R]]esource temporarily unavailable
 : Cannot allocate memory
 : Permission denied
 : Bad address
-: Block device required
+: Block de[[vi]]ce required
-: Device or resource busy
+: De[[vi]]ce or resource busy
 : File exists
-: Invalid cross-device link
+: Invalid cross-de[[vi]]ce link
-: No such device
+: No such de[[vi]]ce
 : Not a directory
 : Is a directory
@@ 96行目: / 96行目: @@
 : Too many open files in system
 : Too many open files
-: Inappropriate ioctl for device
+: Inappropriate ioctl for de[[vi]]ce
 : Text file busy
 : File too large
-: No space left on device
+: No space left on de[[vi]]ce
 : Illegal seek
-: Read-only file system
+: [[R]]ead-only file system
 : Too many links
 : Broken pipe
 : Numerical argument out of domain
 : Numerical result out of range
-: Resource deadlock avoided
+: [[R]]esource deadlock avoided
 : File name too long
 : No locks available
@@ 131行目: / 131行目: @@
 : Unknown error 58
 : Bad font file format
-: Device not a stream
+: De[[vi]]ce not a stream
 : No data available
 : Timer expired
 : Out of streams resources
-: Machine is not on the network
+: [[Mac]]hine is not on the network
 : Package not installed
 : Object is remote
@@ 144行目: / 144行目: @@
 : Protocol error
 : Multihop attempted
-: RFS specific error
+: [[R]]FS specific error
 : Bad message
 : Value too large for defined data type
 : Name not unique on network
 : File descriptor in bad state
-: Remote address changed
+: [[R]]emote address changed
 : Can not access a needed shared library
-: Accessing a corrupted shared library
+: [[Access]]ing a corrupted shared library
 : .lib section in a.out corrupted
 : Attempting to link in too many shared libraries
@@ 192行目: / 192行目: @@
 : No XENIX semaphores available
 : Is a named type file
-: Remote I/O error
+: [[R]]emote I/O error
 : Disk quota exceeded
 : No medium found
 : Wrong medium type
 : Operation canceled
-: Required key not available
+: [[R]]equired key not available
 : Key has expired
 : Key has been revoked
-: Key was rejected by service
+: Key was rejected by ser[[vi]]ce
 : Owner died
 : State not recoverable