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分类: LINUX

2009-03-20 15:19:17

124 EMEDIUMTYPE Wrong medium type
123 ENOMEDIUM No medium found
122 EDQUOT Disk quota exceeded
121 EREMOTEIO Remote I/O error
120 EISNAM Is a named type file
119 ENAVAIL No XENIX semaphores available
118 ENOTNAM Not a XENIX named type file
117 EUCLEAN Structure needs cleaning
116 ESTALE Stale NFS file handle
115 EINPROGRESS +Operation now in progress
114 EALREADY Operation already in progress
113 EHOSTUNREACH No route to host
112 EHOSTDOWN Host is down
111 ECONNREFUSED Connection refused
110 ETIMEDOUT +Connection timed out
109 ETOOMANYREFS Too many references: cannot splice
108 ESHUTDOWN Cannot send after transport endpoint shutdown
107 ENOTCONN Transport endpoint is not connected
106 EISCONN Transport endpoint is already connected
105 ENOBUFS No buffer space available
104 ECONNRESET Connection reset by peer
103 ECONNABORTED Software caused connection abort
102 ENETRESET Network dropped connection on reset
101 ENETUNREACH Network is unreachable
100 ENETDOWN Network is down
99 EADDRNOTAVAIL Cannot assign requested address
98 EADDRINUSE Address already in use
97 EAFNOSUPPORT Address family not supported by protocol
96 EPFNOSUPPORT Protocol family not supported
95 EOPNOTSUPP Operation not supported
94 ESOCKTNOSUPPORT Socket type not supported
93 EPROTONOSUPPORT Protocol not supported
92 ENOPROTOOPT Protocol not available
91 EPROTOTYPE Protocol wrong type for socket
90 EMSGSIZE +Message too long
89 EDESTADDRREQ Destination address required
88 ENOTSOCK Socket operation on non-socket
87 EUSERS Too many users
86 ESTRPIPE Streams pipe error
85 ERESTART Interrupted system call should be restarted
84 EILSEQ Invalid or incomplete multibyte or wide character
83 ELIBEXEC Cannot exec a shared library directly
82 ELIBMAX Attempting to link in too many shared libraries
81 ELIBSCN .lib section in a.out corrupted
80 ELIBBAD Accessing a corrupted shared library
79 ELIBACC Can not access a needed shared library
78 EREMCHG Remote address changed
77 EBADFD File descriptor in bad state
76 ENOTUNIQ Name not unique on network
75 EOVERFLOW Value too large for defined data type
74 EBADMSG +Bad message
73 EDOTDOT RFS specific error
72 EMULTIHOP Multihop attempted
71 EPROTO Protocol error
70 ECOMM Communication error on send
69 ESRMNT Srmount error
68 EADV Advertise error
67 ENOLINK Link has been severed
66 EREMOTE Object is remote
65 ENOPKG Package not installed
64 ENONET Machine is not on the network
63 ENOSR Out of streams resources
62 ETIME Timer expired
61 ENODATA No data available
60 ENOSTR Device not a stream
59 EBFONT Bad font file format
57 EBADSLT Invalid slot
56 EBADRQC Invalid request code
55 ENOANO No anode
54 EXFULL Exchange full
53 EBADR Invalid request descriptor
52 EBADE Invalid exchange
51 EL2HLT Level 2 halted
50 ENOCSI No CSI structure available
49 EUNATCH Protocol driver not attached
48 ELNRNG Link number out of range
47 EL3RST Level 3 reset
46 EL3HLT Level 3 halted
45 EL2NSYNC Level 2 not synchronized
44 ECHRNG Channel number out of range
43 EIDRM Identifier removed
本文来自: () 详细出处参考:
 
42 ENOMSG No message of desired type
40 ELOOP Too many levels of symbolic links
39 ENOTEMPTY +Directory not empty
38 ENOSYS +Function not implemented
37 ENOLCK +No locks available
36 ENAMETOOLONG +File name too long
35 EDEADLK +Resource deadlock avoided
34 ERANGE +Numerical result out of range
33 EDOM +Numerical argument out of domain
32 EPIPE +Broken pipe
31 EMLINK +Too many links
30 EROFS +Read-only file system
29 ESPIPE +Illegal seek
28 ENOSPC +No space left on device
27 EFBIG +File too large
26 ETXTBSY Text file busy
25 ENOTTY +Inappropriate ioctl for device
24 EMFILE +Too many open files
23 ENFILE +Too many open files in system
22 EINVAL +Invalid argument
21 EISDIR +Is a directory
20 ENOTDIR +Not a directory
19 ENODEV +No such device
18 EXDEV +Invalid cross-device link
17 EEXIST +File exists
16 EBUSY +Device or resource busy
15 ENOTBLK Block device required
14 EFAULT +Bad address
13 EACCES +Permission denied
12 ENOMEM +Cannot allocate memory
11 EAGAIN +Resource temporarily unavailable
10 ECHILD +No child processes
9 EBADF +Bad file descriptor
8 ENOEXEC +Exec format error
7 E2BIG +Argument list too long
6 ENXIO +No such device or address
5 EIO +Input/output error
4 EINTR +Interrupted system call
3 ESRCH +No such process
2 ENOENT +No such file or directory
1 EPERM +Operation not permitted
# 0 -- Success
本文来自: () 详细出处参考:
 
 
 

Name

errno - number of last error

Synopsis

#include <>

Description

The <> header file defines the integer variable errno, which is set by system calls and some library functions in the event of an error to indicate what went wrong. Its value is significant only when the call returned an error (usually -1), and a function that does succeed is allowed to change errno.

Sometimes, when -1 is also a valid successful return value one has to zero errno before the call in order to detect possible errors.

errno is defined by the ISO C standard to be a modifiable lvalue of type int, and must not be explicitly declared; errno may be a macro. errno is thread-local; setting it in one thread does not affect its value in any other thread.

Valid error numbers are all non-zero; errno is never set to zero by any library function. All the error names specified by POSIX.1 must have distinct values, with the exception of EAGAIN and EWOULDBLOCK, which may be the same.

Below is a list of the symbolic error names that are defined on Linux. Some of these are marked POSIX.1, indicating that the name is defined by POSIX.1-2001, or C99, indicating that the name is defined by C99.

E2BIG

Argument list too long (POSIX.1)

EACCES

Permission denied (POSIX.1)

EADDRINUSE
Address already in use (POSIX.1)
EADDRNOTAVAIL
Address not available (POSIX.1)
EAFNOSUPPORT
Address family not supported (POSIX.1)
EAGAIN

Resource temporarily unavailable (may be the same value as EWOULDBLOCK) (POSIX.1)

EALREADY
Connection already in progress (POSIX.1)
EBADE

Invalid exchange

EBADF

Bad file descriptor (POSIX.1)

EBADFD

File descriptor in bad state

EBADMSG
Bad message (POSIX.1)
EBADR

Invalid request descriptor

EBADRQC
Invalid request code
EBADSLT
Invalid slot
EBUSY

Device or resource busy (POSIX.1)

ECANCELED
Operation canceled (POSIX.1)
ECHILD

No child processes (POSIX.1)

ECHRNG

Channel number out of range

ECOMM

Communication error on send

ECONNABORTED
Connection aborted (POSIX.1)
ECONNREFUSED
Connection refused (POSIX.1)
ECONNRESET
Connection reset (POSIX.1)
EDEADLK
Resource deadlock avoided (POSIX.1)
EDEADLOCK
Synonym for EDEADLK
EDESTADDRREQ
Destination address required (POSIX.1)
EDOM

Mathematics argument out of domain of function (POSIX.1, C99)

EDQUOT

Disk quota exceeded (POSIX.1)

EEXIST

File exists (POSIX.1)

EFAULT

Bad address (POSIX.1)

EFBIG

File too large (POSIX.1)

EHOSTDOWN
Host is down
EHOSTUNREACH
Host is unreachable (POSIX.1)
EIDRM

Identifier removed (POSIX.1)

EILSEQ

Illegal byte sequence (POSIX.1, C99)

EINPROGRESS
Operation in progress (POSIX.1)
EINTR

Interrupted function call (POSIX.1)

EINVAL

Invalid argument (POSIX.1)

EIO

Input/output error (POSIX.1)

EISCONN
Socket is connected (POSIX.1)
EISDIR

Is a directory (POSIX.1)

EISNAM

Is a named type file

EKEYEXPIRED
Key has expired
EKEYREJECTED
Key was rejected by service
EKEYREVOKED
Key has been revoked
EL2HLT

Level 2 halted

EL2NSYNC
Level 2 not synchronized
EL3HLT

Level 3 halted

EL3RST

Level 3 halted

ELIBACC
Cannot access a needed shared library
ELIBBAD
Accessing a corrupted shared library
ELIBMAX
Attempting to link in too many shared libraries
ELIBSCN
lib section in a.out corrupted
ELIBEXEC
Cannot exec a shared library directly
ELOOP

Too many levels of symbolic links (POSIX.1)

EMEDIUMTYPE
Wrong medium type
EMFILE

Too many open files (POSIX.1)

EMLINK

Too many links (POSIX.1)

EMSGSIZE
Message too long (POSIX.1)
EMULTIHOP
Multihop attempted (POSIX.1)
ENAMETOOLONG
Filename too long (POSIX.1)
ENETDOWN
Network is down (POSIX.1)
ENETRESET
Connection aborted by network (POSIX.1)
ENETUNREACH
Network unreachable (POSIX.1)
ENFILE

Too many open files in system (POSIX.1)

ENOBUFS
No buffer space available (POSIX.1 (XSI STREAMS option))
ENODATA
No message is available on the STREAM head read queue (POSIX.1)
ENODEV

No such device (POSIX.1)

ENOENT

No such file or directory (POSIX.1)

ENOEXEC
Exec format error (POSIX.1)
ENOKEY

Required key not available

ENOLCK

No locks available (POSIX.1)

ENOLINK
Link has been severed (POSIX.1)
ENOMEDIUM
No medium found
ENOMEM

Not enough space (POSIX.1)

ENOMSG

No message of the desired type (POSIX.1)

ENONET

Machine is not on the network

ENOPKG

Package not installed

ENOPROTOOPT
Protocol not available (POSIX.1)
ENOSPC

No space left on device (POSIX.1)

ENOSR

No STREAM resources (POSIX.1 (XSI STREAMS option))

ENOSTR

Not a STREAM (POSIX.1 (XSI STREAMS option))

ENOSYS

Function not implemented (POSIX.1)

ENOTBLK
Block device required
ENOTCONN
The socket is not connected (POSIX.1)
ENOTDIR
Not a directory (POSIX.1)
ENOTEMPTY
Directory not empty (POSIX.1)
ENOTSOCK
Not a socket (POSIX.1)
ENOTSUP
Operation not supported (POSIX.1)
ENOTTY

Inappropriate I/O control operation (POSIX.1)

ENOTUNIQ
Name not unique on network
ENXIO

No such device or address (POSIX.1)

EOPNOTSUPP
Operation not supported on socket (POSIX.1)

(ENOTSUP and EOPNOTSUPP have the same value on Linux, but according to POSIX.1 these error values should be distinct.)

EOVERFLOW
Value too large to be stored in data type (POSIX.1)
EPERM

Operation not permitted (POSIX.1)

EPFNOSUPPORT
Protocol family not supported
EPIPE

Broken pipe (POSIX.1)

EPROTO

Protocol error (POSIX.1)

EPROTONOSUPPORT
Protocol not supported (POSIX.1)
EPROTOTYPE
Protocol wrong type for socket (POSIX.1)
ERANGE

Result too large (POSIX.1, C99)

EREMCHG
Remote address changed
EREMOTE
Object is remote
EREMOTEIO
Remote I/O error
ERESTART
Interrupted system call should be restarted
EROFS

Read-only file system (POSIX.1)

ESHUTDOWN
Cannot send after transport endpoint shutdown
ESPIPE

Invalid seek (POSIX.1)

ESOCKTNOSUPPORT
Socket type not supported
ESRCH

No such process (POSIX.1)

ESTALE

Stale file handle (POSIX.1))

This error can occur for NFS and for other file systems
ESTRPIPE
Streams pipe error
ETIME

Timer expired (POSIX.1 (XSI STREAMS option))

(POSIX.1 says "STREAM ioctl() timeout")
ETIMEDOUT
Connection timed out (POSIX.1)
ETXTBSY
Text file busy (POSIX.1)
EUCLEAN
Structure needs cleaning
EUNATCH
Protocol driver not attached
EUSERS

Too many users

EWOULDBLOCK
Operation would block (may be same value as EAGAIN) (POSIX.1)
EXDEV

Improper link (POSIX.1)

EXFULL

Exchange full

Notes

A common mistake is to do

if (somecall() == -1) {
    printf("somecall() failed\n");
    if (errno == ...) { ... }
}
where errno no longer needs to have the value it had upon return from somecall() (i.e., it may have been changed by the printf()). If the value of errno should be preserved across a library call, it must be saved:
if (somecall() == -1) {
    int errsv = errno;
    printf("somecall() failed\n");
    if (errsv == ...) { ... }
}
It was common in traditional C to declare errno manually (i.e., extern int errno) instead of including <>. Do not do this. It will not work with modern versions of the C library. However, on (very) old Unix systems, there may be no <> and the declaration is needed.

See Also

(3), (3), (3), (3)

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