errno.h(0p)

1errno.h(0P)                POSIX Programmer's Manual               errno.h(0P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
10
11

NAME

13       errno.h — system error numbers
14

SYNOPSIS

16       #include <errno.h>
17

DESCRIPTION

19       Some of the functionality described on this reference page extends  the
20       ISO C  standard.  Any  conflict between the requirements described here
21       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
22       defers to the ISO C standard.
23
24       The  ISO C  standard  only  requires  the symbols [EDOM], [EILSEQ], and
25       [ERANGE] to be defined.
26
27       The <errno.h> header shall provide  a  declaration  or  definition  for
28       errno.   The  symbol  errno shall expand to a modifiable lvalue of type
29       int.  It is unspecified whether errno  is  a  macro  or  an  identifier
30       declared  with external linkage. If a macro definition is suppressed in
31       order to access an actual object, or a program  defines  an  identifier
32       with the name errno, the behavior is undefined.
33
34       The  <errno.h>  header  shall  define  the following macros which shall
35       expand to integer constant expressions with type int, distinct positive
36       values  (except as noted below), and which shall be suitable for use in
37       #if preprocessing directives:
38
39       E2BIG  Argument list too long.
40
41       EACCES Permission denied.
42
43       EADDRINUSE
44              Address in use.
45
46       EADDRNOTAVAIL
47              Address not available.
48
49       EAFNOSUPPORT
50              Address family not supported.
51
52       EAGAIN Resource unavailable, try  again  (may  be  the  same  value  as
53              [EWOULDBLOCK]).
54
55       EALREADY
56              Connection already in progress.
57
58       EBADF  Bad file descriptor.
59
60       EBADMSG
61              Bad message.
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63       EBUSY  Device or resource busy.
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65       ECANCELED
66              Operation canceled.
67
68       ECHILD No child processes.
69
70       ECONNABORTED
71              Connection aborted.
72
73       ECONNREFUSED
74              Connection refused.
75
76       ECONNRESET
77              Connection reset.
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79       EDEADLK
80              Resource deadlock would occur.
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82       EDESTADDRREQ
83              Destination address required.
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85       EDOM   Mathematics argument out of domain of function.
86
87       EDQUOT Reserved.
88
89       EEXIST File exists.
90
91       EFAULT Bad address.
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93       EFBIG  File too large.
94
95       EHOSTUNREACH
96              Host is unreachable.
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98       EIDRM  Identifier removed.
99
100       EILSEQ Illegal byte sequence.
101
102       EINPROGRESS
103              Operation in progress.
104
105       EINTR  Interrupted function.
106
107       EINVAL Invalid argument.
108
109       EIO    I/O error.
110
111       EISCONN
112              Socket is connected.
113
114       EISDIR Is a directory.
115
116       ELOOP  Too many levels of symbolic links.
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118       EMFILE File descriptor value too large.
119
120       EMLINK Too many links.
121
122       EMSGSIZE
123              Message too large.
124
125       EMULTIHOP
126              Reserved.
127
128       ENAMETOOLONG
129              Filename too long.
130
131       ENETDOWN
132              Network is down.
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134       ENETRESET
135              Connection aborted by network.
136
137       ENETUNREACH
138              Network unreachable.
139
140       ENFILE Too many files open in system.
141
142       ENOBUFS
143              No buffer space available.
144
145       ENODATA
146              No message is available on the STREAM head read queue.
147
148       ENODEV No such device.
149
150       ENOENT No such file or directory.
151
152       ENOEXEC
153              Executable file format error.
154
155       ENOLCK No locks available.
156
157       ENOLINK
158              Reserved.
159
160       ENOMEM Not enough space.
161
162       ENOMSG No message of the desired type.
163
164       ENOPROTOOPT
165              Protocol not available.
166
167       ENOSPC No space left on device.
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169       ENOSR  No STREAM resources.
170
171       ENOSTR Not a STREAM.
172
173       ENOSYS Function not supported.
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175       ENOTCONN
176              The socket is not connected.
177
178       ENOTDIR
179              Not a directory or a symbolic link to a directory.
180
181       ENOTEMPTY
182              Directory not empty.
183
184       ENOTRECOVERABLE
185              State not recoverable.
186
187       ENOTSOCK
188              Not a socket.
189
190       ENOTSUP
191              Not supported (may be the same value as [EOPNOTSUPP]).
192
193       ENOTTY Inappropriate I/O control operation.
194
195       ENXIO  No such device or address.
196
197       EOPNOTSUPP
198              Operation  not  supported  on  socket  (may be the same value as
199              [ENOTSUP]).
200
201       EOVERFLOW
202              Value too large to be stored in data type.
203
204       EOWNERDEAD
205              Previous owner died.
206
207       EPERM  Operation not permitted.
208
209       EPIPE  Broken pipe.
210
211       EPROTO Protocol error.
212
213       EPROTONOSUPPORT
214              Protocol not supported.
215
216       EPROTOTYPE
217              Protocol wrong type for socket.
218
219       ERANGE Result too large.
220
221       EROFS  Read-only file system.
222
223       ESPIPE Invalid seek.
224
225       ESRCH  No such process.
226
227       ESTALE Reserved.
228
229       ETIME  Stream ioctl() timeout.
230
231       ETIMEDOUT
232              Connection timed out.
233
234       ETXTBSY
235              Text file busy.
236
237       EWOULDBLOCK
238              Operation would block (may be the same value as [EAGAIN]).
239
240       EXDEV  Cross-device link.
241
242       The following sections are informative.
243

APPLICATION USAGE

245       Additional error numbers may be defined on conforming systems; see  the
246       System Interfaces volume of POSIX.1‐2008.
247

RATIONALE

249       None.
250

FUTURE DIRECTIONS

252       None.
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COPYRIGHT

259       Portions of this text are reprinted and reproduced in  electronic  form
260       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
261       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
262       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
263       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
264       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
265       event of any discrepancy between this version and the original IEEE and
266       The  Open Group Standard, the original IEEE and The Open Group Standard
267       is the referee document. The original Standard can be  obtained  online
268       at http://www.unix.org/online.html .
269
270       Any  typographical  or  formatting  errors that appear in this page are
271       most likely to have been introduced during the conversion of the source
272       files  to  man page format. To report such errors, see https://www.ker‐
273       nel.org/doc/man-pages/reporting_bugs.html .
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277IEEE/The Open Group                  2013                          errno.h(0P)