errno.h

/*
	This file is part of Fennix Kernel.

	Fennix Kernel is free software: you can redistribute it and/or
	modify it under the terms of the GNU General Public License as
	published by the Free Software Foundation, either version 3 of
	the License, or (at your option) any later version.

	Fennix Kernel is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
*/

#ifndef __FENNIX_KERNEL_ERRNO_H__
#define __FENNIX_KERNEL_ERRNO_H__

/**
 * The documentation for these error codes are from:
 *  https://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html
 *
 * Full list:
 *  https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/basedefs/errno.h.html
 */
typedef enum
{
	/**
	 * No Error
	 */
	EOK = 0,

	/**
	 * Argument list too long. The sum of the number of bytes used by the
	 *  new process image's argument list and environment list is greater
	 *  than the system-imposed limit of {ARG_MAX} bytes.
	 * or:
	 * Lack of space in an output buffer.
	 * or:
	 * Argument is greater than the system-imposed maximum.
	 */
	E2BIG = 1,

	/**
	 * Permission denied. An attempt was made to access a file in a way
	 *  forbidden by its file access permissions.
	 */
	EACCES = 2,

	/**
	 * Address in use. The specified address is in use.
	 */
	EADDRINUSE = 3,

	/**
	 * Address not available. The specified address is not available from
	 *  the local system.
	 */
	EADDRNOTAVAIL = 4,

	/**
	 * Address family not supported. The implementation does not support
	 *  the specified address family, or the specified address is not a
	 *  valid address for the address family of the specified socket.
	 */
	EAFNOSUPPORT = 5,

	/**
	 * Resource temporarily unavailable. This is a temporary condition
	 *  and later calls to the same routine may complete normally.
	 */
	EAGAIN = 6,

	/**
	 * Connection already in progress. A connection request is already in
	 *  progress for the specified socket.
	 */
	EALREADY = 7,

	/**
	 * Bad file descriptor. A file descriptor argument is out of range,
	 *  refers to no open file, or a read (write) request is made to a
	 *  file that is only open for writing (reading).
	 */
	EBADF = 8,

	/**
	 * Bad message. During a read(), getmsg(), getpmsg(), or ioctl()
	 *  I_RECVFD request to a STREAMS device, a message arrived at the
	 *  head of the STREAM that is inappropriate for the function
	 *  receiving the message.
	 * read()
	 * Message waiting to be read on a STREAM is not a data message.
	 * getmsg() or getpmsg()
	 * A file descriptor was received instead of a control message.
	 * ioctl()
	 * Control or data information was received instead of a file
	 *  descriptor when I_RECVFD was specified.
	 */
	EBADMSG = 9,

	/**
	 * Resource busy. An attempt was made to make use of a system
	 *  resource that is not currently available, as it is being
	 *  used by another process in a manner that would have
	 *  conflicted with the request being made by this process.
	 */
	EBUSY = 10,

	/**
	 * Operation canceled. The associated asynchronous operation was
	 *  canceled before completion.
	 */
	ECANCELED = 11,

	/**
	 * No child process. A wait(), waitid(), or waitpid() function was
	 *  executed by a process that had no existing or unwaited-for
	 *  child process.
	 */
	ECHILD = 12,

	/**
	 * Connection aborted. The connection has been aborted.
	 */
	ECONNABORTED = 13,

	/**
	 * Connection refused. An attempt to connect to a socket was refused
	 *  because there was no process listening or because the queue of
	 *  connection requests was full and the underlying protocol does not
	 *  support retransmissions.
	 */
	ECONNREFUSED = 14,

	/**
	 * Connection reset. The connection was forcibly closed by the peer.
	 */
	ECONNRESET = 15,

	/**
	 * Resource deadlock would occur. An attempt was made to lock a system
	 *  resource that would have resulted in a deadlock situation.
	 */
	EDEADLK = 16,

	/**
	 * Destination address required. No bind address was established.
	 */
	EDESTADDRREQ = 17,

	/**
	 * Domain error. An input argument is outside the defined domain of the
	 *  mathematical function (defined in the ISO C standard).
	 */
	EDOM = 18,

	/**
	 * Reserved.
	 */
	EDQUOT = 19,

	/**
	 * File exists. An existing file was mentioned in an inappropriate
	 *  context; for example, as a new link name in the link() function.
	 */
	EEXIST = 20,

	/**
	 * Bad address. The system detected an invalid address in attempting
	 *  to use an argument of a call. The reliable detection of this error
	 *  cannot be guaranteed, and when not detected may result in the
	 *  generation of a signal, indicating an address violation, which is
	 *  sent to the process.
	 */
	EFAULT = 21,

	/**
	 * File too large. The size of a file would exceed the maximum file
	 *  size of an implementation or offset maximum established in the
	 *  corresponding file description.
	 */
	EFBIG = 22,

	/**
	 * Host is unreachable. The destination host cannot be reached
	 *  (probably because the host is down or a remote router cannot
	 *  reach it).
	 */
	EHOSTUNREACH = 23,

	/**
	 * Identifier removed. Returned during XSI interprocess communication
	 *  if an identifier has been removed from the system.
	 */
	EIDRM = 24,

	/**
	 * Illegal byte sequence. A wide-character code has been detected that
	 *  does not correspond to a valid character, or a byte sequence does
	 *  not form a valid wide-character code (defined in the ISO C standard).
	 */
	EILSEQ = 25,

	/**
	 * Operation in progress. This code is used to indicate that an
	 *  asynchronous operation has not yet completed.
	 * or:
	 * O_NONBLOCK is set for the socket file descriptor and the connection
	 *  cannot be immediately established.
	 */
	EINPROGRESS = 26,

	/**
	 * Interrupted function call. An asynchronous signal was caught by the
	 *  process during the execution of an interruptible function. If the
	 *  signal handler performs a normal return, the interrupted function
	 *  call may return this condition (see the Base Definitions volume
	 *  of POSIX.1-2017, <signal.h>).
	 */
	EINTR = 27,

	/**
	 * Invalid argument. Some invalid argument was supplied; for example,
	 *  specifying an undefined signal in a signal() function or a
	 *  kill() function.
	 */
	EINVAL = 28,

	/**
	 * Input/output error. Some physical input or output error has occurred.
	 *  This error may be reported on a subsequent operation on the same
	 *  file descriptor. Any other error-causing operation on the same file
	 *  descriptor may cause the [EIO] error indication to be lost.
	 */
	EIO = 29,

	/**
	 * Socket is connected. The specified socket is already connected.
	 */
	EISCONN = 30,

	/**
	 * Is a directory. An attempt was made to open a directory with write
	 *  mode specified.
	 */
	EISDIR = 31,

	/**
	 * Symbolic link loop. A loop exists in symbolic links encountered
	 *  during pathname resolution. This error may also be returned if
	 *  more than {SYMLOOP_MAX} symbolic links are encountered during
	 *  pathname resolution.
	 */
	ELOOP = 32,

	/**
	 * File descriptor value too large or too many open streams. An
	 *  attempt was made to open a file descriptor with a value greater
	 *  than or equal to {OPEN_MAX}, or an attempt was made to open more
	 *  than the maximum number of streams allowed in the process.
	 */
	EMFILE = 33,

	/**
	 * Too many links. An attempt was made to have the link count of a
	 *  single file exceed {LINK_MAX}.
	 */
	EMLINK = 34,

	/**
	 * Message too large. A message sent on a transport provider was
	 *  larger than an internal message buffer or some other network limit.
	 * or:
	 * Inappropriate message buffer length.
	 */
	EMSGSIZE = 35,

	/**
	 * Reserved.
	 */
	EMULTIHOP = 36,

	/**
	 * Filename too long. The length of a pathname exceeds {PATH_MAX} and
	 *  the implementation considers this to be an error, or a pathname
	 *  component is longer than {NAME_MAX}. This error may also occur
	 *  when pathname substitution, as a result of encountering a
	 *  symbolic link during pathname resolution, results in a pathname
	 *  string the size of which exceeds {PATH_MAX}.
	 */
	ENAMETOOLONG = 37,

	/**
	 * Network is down. The local network interface used to reach the
	 *  destination is down.
	 */
	ENETDOWN = 38,

	/**
	 * The connection was aborted by the network.
	 */
	ENETRESET = 39,

	/**
	 * Network unreachable. No route to the network is present.
	 */
	ENETUNREACH = 40,

	/**
	 * Too many files open in system. Too many files are currently open
	 *  in the system. The system has reached its predefined limit for
	 *  simultaneously open files and temporarily cannot accept requests
	 *  to open another one.
	 */
	ENFILE = 41,

	/**
	 * No buffer space available. Insufficient buffer resources were
	 *  available in the system to perform the socket operation.
	 */
	ENOBUFS = 42,

	/**
	 * No message available. No message is available on the STREAM head
	 *  read queue.
	 */
	ENODATA = 43,

	/**
	 * No such device. An attempt was made to apply an inappropriate
	 *  function to a device; for example, trying to read a write-only
	 *  device such as a printer.
	 */
	ENODEV = 44,

	/**
	 * No such file or directory. A component of a specified pathname
	 *  does not exist, or the pathname is an empty string.
	 */
	ENOENT = 45,

	/**
	 * Executable file format error. A request is made to execute a file
	 *  that, although it has appropriate privileges, is not in the
	 *  format required by the implementation for executable files.
	 */
	ENOEXEC = 46,

	/**
	 * No locks available. A system-imposed limit on the number of
	 *  simultaneous file and record locks has been reached and no more
	 *  are currently available.
	 */
	ENOLCK = 47,

	/**
	 * Reserved.
	 */
	ENOLINK = 48,

	/**
	 * Not enough space. The new process image requires more memory than
	 *  is allowed by the hardware or system-imposed memory management
	 *  constraints.
	 */
	ENOMEM = 49,

	/**
	 * No message of the desired type. The message queue does not contain
	 *  a message of the required type during XSI interprocess communication.
	 */
	ENOMSG = 50,

	/**
	 * Protocol not available. The protocol option specified to
	 *  setsockopt() is not supported by the implementation.
	 */
	ENOPROTOOPT = 51,

	/**
	 * No space left on a device. During the write() function on a
	 *  regular file or when extending a directory, there is no free
	 *  space left on the device.
	 */
	ENOSPC = 52,

	/**
	 * No STREAM resources. Insufficient STREAMS memory resources are
	 *  available to perform a STREAMS-related function. This is a
	 *  temporary condition; it may be recovered from if other
	 *  processes release resources.
	 */
	ENOSR = 53,

	/**
	 * Not a STREAM. A STREAM function was attempted on a file descriptor
	 *  that was not associated with a STREAMS device.
	 */
	ENOSTR = 54,

	/**
	 * Functionality not supported. An attempt was made to use optional
	 *  functionality that is not supported in this implementation.
	 */
	ENOSYS = 55,

	/**
	 * Socket not connected. The socket is not connected.
	 */
	ENOTCONN = 56,

	/**
	 * Not a directory. A component of the specified pathname exists, but
	 *  it is not a directory, when a directory was expected; or an
	 *  attempt was made to create a non-directory file, and the specified
	 *  pathname contains at least one non- <slash> character and ends
	 *  with one or more trailing <slash> characters.
	 */
	ENOTDIR = 57,

	/**
	 * Directory not empty. A directory other than an empty directory
	 *  was supplied when an empty directory was expected.
	 */
	ENOTEMPTY = 58,

	/**
	 * State not recoverable. The state protected by a robust mutex
	 *  is not recoverable.
	 */
	ENOTRECOVERABLE = 59,

	/**
	 * Not a socket. The file descriptor does not refer to a socket.
	 */
	ENOTSOCK = 60,

	/**
	 * Not supported. The implementation does not support the requested
	 *  feature or value.
	 */
	ENOTSUP = 61,

	/**
	 * Inappropriate I/O control operation. A control function has been
	 *  attempted for a file or special file for which the operation
	 *  is inappropriate.
	 */
	ENOTTY = 62,

	/**
	 * No such device or address. Input or output on a special file
	 *  refers to a device that does not exist, or makes a request
	 *  beyond the capabilities of the device. It may also occur when,
	 *  for example, a tape drive is not on-line.
	 */
	ENXIO = 63,

	/**
	 * Operation not supported on socket. The type of socket (address
	 *  family or protocol) does not support the requested operation.
	 */
	EOPNOTSUPP = 64,

	/**
	 * Value too large to be stored in data type. An operation was
	 *  attempted which would generate a value that is outside the
	 *  range of values that can be represented in the relevant data
	 *  type or that are allowed for a given data item.
	 */
	EOVERFLOW = 65,

	/**
	 * Previous owner died. The owner of a robust mutex terminated
	 *  while holding the mutex lock.
	 */
	EOWNERDEAD = 66,

	/**
	 * Operation not permitted. An attempt was made to perform an
	 *  operation limited to processes with appropriate privileges or
	 *  to the owner of a file or other resource.
	 */
	EPERM = 67,

	/**
	 * Broken pipe. A write was attempted on a socket, pipe, or FIFO
	 *  for which there is no process to read the data.
	 */
	EPIPE = 68,

	/**
	 * Protocol error. Some protocol error occurred. This error is
	 *  device-specific, but is generally not related to a
	 *  hardware failure.
	 */
	EPROTO = 69,

	/**
	 * Protocol not supported. The protocol is not supported by the
	 *  address family, or the protocol is not supported by
	 *  the implementation.
	 */
	EPROTONOSUPPORT = 70,

	/**
	 * Protocol wrong type for socket. The socket type is not
	 *  supported by the protocol.
	 */
	EPROTOTYPE = 71,

	/**
	 * Result too large or too small. The result of the function
	 *  is too large (overflow) or too small (underflow) to be
	 *  represented in the available space.
	 */
	ERANGE = 72,

	/**
	 * Read-only file system. An attempt was made to modify a file
	 *  or directory on a file system that is read-only.
	 */
	EROFS = 73,

	/**
	 * Invalid seek. An attempt was made to access the file offset
	 *  associated with a pipe or FIFO.
	 */
	ESPIPE = 74,

	/**
	 * No such process. No process can be found corresponding to that
	 *  specified by the given process ID.
	 */
	ESRCH = 75,

	/**
	 * Reserved.
	 */
	ESTALE = 76,

	/**
	 * STREAM ioctl() timeout. The timer set for a STREAMS ioctl() call
	 *  has expired. The cause of this error is device-specific and could
	 *  indicate either a hardware or software failure, or a timeout
	 *  value that is too short for the specific operation. The status
	 *  of the ioctl() operation is unspecified.
	 */
	ETIME = 77,

	/**
	 * Connection timed out. The connection to a remote machine has
	 *  timed out.
	 * If the connection timed out during execution of the function that
	 *  reported this error (as opposed to timing out prior to the
	 *  function being called), it is unspecified whether the function
	 *  has completed some or all of the documented behavior associated
	 *  with a successful completion of the function.
	 * or:
	 * Operation timed out. The time limit associated with the operation
	 *  was exceeded before the operation completed.
	 */
	ETIMEDOUT = 78,

	/**
	 * Text file busy. An attempt was made to execute a pure-procedure
	 *  program that is currently open for writing, or an attempt has
	 *  been made to open for writing a pure-procedure program that
	 *  is being executed.
	 */
	ETXTBSY = 79,

	/**
	 * Operation would block. An operation on a socket marked as
	 *  non-blocking has encountered a situation such as no data available
	 *  that otherwise would have caused the function to suspend execution.
	 */
	EWOULDBLOCK = 80,

	/**
	 * Improper link. A link to a file on another file system was attempted.
	 */
	EXDEV = 81,

	__ERRNO_MAX
} KernelErrors;

#include <types.h>
EXTERNC int *__errno_location(void) __attribute__((const));
#define errno (*__errno_location())

#ifdef __cplusplus
extern "C"
{
#endif
	char *strerror(int errnum);
#ifdef __cplusplus
}
#endif

#endif // !__FENNIX_KERNEL_ERRNO_H__