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38 .Nd kernel internal error numbers
42 This section provides an overview of the error numbers used internally
43 by the kernel and indicate neither success nor failure.
44 These error numbers are not returned to userland code.
46 Kernel functions that indicate success or failure by means of either 0
49 value sometimes have a need to indicate that
51 handling is required at an upper layer or, in the case of
54 .Dq nothing was wrong but the request was not handled .
55 To handle these cases, some negative
57 values are defined which are handled by the kernel before returning a
60 value to userland or simply zero.
62 The following is a list of the defined names and their meanings as
65 .\"It is important to note that the value \-1 is
67 .\"used, since it is commonly used to indicate generic failure and leaves
68 .\"it up to the caller to determine the action to take.
70 .It Er \-1 ERESTART Em "Restart syscall" .
71 The system call should be restarted.
72 This typically means that the machine dependent system call trap code
73 will reposition the process's instruction pointer or program counter
74 to re-execute the current system call with no other work required.
75 .It Er \-2 EJUSTRETURN Em "Do not modify regs, just return" .
76 No more work is required and the function should just return.
77 .It Er \-3 ENOIOCTL Em "Ioctl not handled by this layer" .
80 was not handled and should be passed through to another layer.
81 .It Er \-4 EMOUNTEXIT Em "Mountpoint released via vfs_start()" .
91 manual page appeared in
95 manual page appeared in