errno Values
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Constant: ECHILD, EAGAIN, E2BIG, EACCES, EBADF, EDEADLOCK, EDOM,
EEXIST, EINVAL, EMFILE, ENOENT, ENOEXEC, ENOMEM, ENOSPC,
ERANGE, EXDEV
Include: <errno.h>
See also: errno
Synopsis: Constants assigned to errno in the event of various error
conditions.
The meaning of each constant is given below:
Constant Meaning
ECHILD No child processes.
A wait was attempted by a thread that has no child
processes, or whose child process had the no-wait
option specified.
EAGAIN No more processes.
An attempt to create a new process failed, because
there are no more process slots, or there is not
enough memory, or the maximum nesting level has been
reached.
E2BIG Arg list too long.
Under DOS: The argument list exceeds 128 bytes, or
the space required for the environment information
exceeds 32K.
Under OS/2: The total space required for command
arguments and the environment exceeds 32K.
EACCES Permission denied.
The file's permission setting does not allow the
specified access. This error signifies that an
attempt was made to access a file. (or, in some
cases, a directory) in a way that is incompatible
with the file's attributes.
For example, the error can occur when an attempt is
made to read from a file that is not open, to open
an existing read-only file for writing, or to open a
directory instead of a file. Under MS-DOS versions
3.0 and later, EACCES may also indicate a locking or
sharing violation.
The error can also occur in an attempt to rename a
file or directory or to remove an existing
directory.
EBADF Bad file number.
The specified file handle is not a valid file-handle
value or does not refer to an open file; or an
attempt was made to write to a file or device opened
for read-only access (or vice versa).
EDEADLOCK Resource deadlock would occur.
The file cannot be locked after 10 attempts (MS-DOS
versions 3.0 and later only).
EDOM Math argument.
The argument to a math function is not in the domain
of the function.
EEXIST File exists.
An attempt has been made to create a file that
already exists. For example, the O_CREAT and O_EXCL
flags are specified in an open call, but the named
file already exists.
EINVAL Invalid argument.
An invalid value was given for one of the arguments
to a function. For example, the value given for the
origin when positioning a file pointer (by means of
a call to fseek) is before the beginning of the file.
EMFILE Too many open files.
No more file handles are available, so no more files
can be opened.
ENOENT No such file or directory.
The specified file or directory does not exist or
cannot be found. This message can occur whenever a
specified file does not exist or a component of a
path name does not specify an existing directory.
ENOEXEC Exec format error.
An attempt is made to execute a file that is not
executable or that has an invalid executable-file
format.
ENOMEM Not enough core.
Not enough memory is available for the attempted
operator. For example, this message can occur when
insufficient memory is available to execute a child
process, or when the allocation request in a getcwd
call cannot be satisfied.
ENOSPC No space left on device.
No more space for writing is available on the device
(for example, when the disk is full).
ERANGE Result too large.
An argument to a math function is too large,
resulting in partial or total loss of significance
in the result. This error can also occur in other
functions when an argument is larger than expected
(for example, when the path-name argument to the
getcwd function is longer than expected).
EXDEV Cross-device link.
An attempt was made to move a file to a different
device (using the rename function).