加载中…errno.h头文件介绍
(2018-08-19 20:03:30)
标签：
linuxerrno |
分类： Linux人生 |
当 linux C api 函数发生异常时,一般会将 errno 变量(需 include "errno.h"
)赋一个整数值,不同的值表示不同的含义,可以通过查看该值推测出错的原因。
unsigned int linenum, const char *format,
...);
以下来自linux
2.4.20-18的内核代码中的/usr/includem/errno.h
#ifndef _I386_ERRNO_H
#define _I386_ERRNO_H
#define EPERM
1
#define ENOENT
2
#define ESRCH
3
#define EINTR
4
#define EIO
5
#define ENXIO
6
#define E2BIG
7
#define ENOEXEC
8
#define EBADF
9
#define ECHILD
10
#define EAGAIN
11
#define ENOMEM
12
#define EACCES
13
#define EFAULT
14
#define ENOTBLK
15
#define EBUSY
16
#define EEXIST
17
#define EXDEV
18
#define ENODEV
19
#define ENOTDIR
20
#define EISDIR
21
#define EINVAL
22
#define ENFILE
23
#define EMFILE
24
#define ENOTTY
25
#define ETXTBSY
26
#define EFBIG
27
#define ENOSPC
28
#define ESPIPE
29
#define EROFS
30
#define EMLINK
31
#define EPIPE
32
#define EDOM
33
#define ERANGE
34
#define EDEADLK
35
#define ENAMETOOLONG
36
#define ENOLCK
37
#define ENOSYS
38
#define ENOTEMPTY
39
#define ELOOP
40
#define EWOULDBLOCK
EAGAIN
#define ENOMSG
42
#define EIDRM
43
#define ECHRNG
44
#define EL2NSYNC
45
#define EL3HLT
46
#define EL3RST
47
#define ELNRNG
48
#define EUNATCH
49
#define ENOCSI
50
#define EL2HLT
51
#define EBADE
52
#define EBADR
53
#define EXFULL
54
#define ENOANO
55
#define EBADRQC
56
#define EBADSLT
57
#define EDEADLOCK
EDEADLK
#define EBFONT
59
#define ENOSTR
60
#define ENODATA
61
#define ETIME
62
#define ENOSR
63
#define ENONET
64
#define ENOPKG
65
#define EREMOTE
66
#define ENOLINK
67
#define EADV
68
#define ESRMNT
69
#define ECOMM
70
#define EPROTO
71
#define EMULTIHOP
72
#define EDOTDOT
73
#define EBADMSG
74
#define EOVERFLOW
75
#define ENOTUNIQ
76
#define EBADFD
77
#define EREMCHG
78
#define ELIBACC
79
#define ELIBBAD
80
#define ELIBSCN
81
#define ELIBMAX
82
#define ELIBEXEC
83
#define EILSEQ
84
#define ERESTART
85
#define ESTRPIPE
86
#define EUSERS
87
#define ENOTSOCK
88
#define EDESTADDRREQ 89
#define EMSGSIZE
90
#define EPROTOTYPE
91
#define ENOPROTOOPT
92
#define EPROTONOSUPPORT 93
#define ESOCKTNOSUPPORT 94
#define EOPNOTSUPP
95
#define EPFNOSUPPORT 96
#define EAFNOSUPPORT 97
#define EADDRINUSE
98
#define EADDRNOTAVAIL 99
#define ENETDOWN
100
#define ENETUNREACH
101
#define ENETRESET
102
#define ECONNABORTED 103
#define ECONNRESET
104
#define ENOBUFS
105
#define EISCONN
106
#define ENOTCONN
107
#define ESHUTDOWN
108
#define ETOOMANYREFS 109
#define ETIMEDOUT
110
#define ECONNREFUSED
111
#define EHOSTDOWN
112
#define EHOSTUNREACH 113
#define EALREADY
114
#define EINPROGRESS
115
#define ESTALE
116
#define EUCLEAN
117
#define ENOTNAM
118
#define ENAVAIL
119
#define EISNAM
120
#define EREMOTEIO
121
#define EDQUOT
122
#define ENOMEDIUM
123
#define EMEDIUMTYPE
124
#endif // #ifndef _I386_ERRNO_H
//================================================================================
#include
char *strerror(int errnum);
The strerror() function returns a pointer to a string that
describes
the error code sed in the argument errnum, possibly using
the
LC_MESSAGES part of the current locale to select the
appropriate
language.
//================================================================================
#include
void perror(const char *s);
#include
const char * const sys_errlist[];
int sys_nerr;
int errno;
The perror() function produces a message on standard error
describing
the t error encountered during a call to a system or
library
function.
First (if s is not NULL and *s is not a null byte ('\0')),
the
argument string s is printed, followed by a colon and a blank.
Then
an error message corresponding to the current value of errno
and a
new-line.
//================================================================================
#include
void error(int status, int errnum, const char *format,
...);
void error_at_line(int status, int errnum, const char
*filename,
error() is a general error-reporting function.
It flushes stdout,
and then outputs to stderr the program name, a colon and a
space, the
message specified by the printf(3)-style format string format,
and,
if errnum is nonzero, a second colon and a space followed by
the
string given by strerror(errnum). Any
arguments required for format
should follow format in the argument list.
The output is terminated
by a newline character.
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