Generic Error Codes

ERRORS

Generic Error Codes

#define EPERM            1      /* Operation not permitted */

#define ENOENT           2      /* No such file or directory */

#define ESRCH            3      /* No such process */

#define EINTR            4      /* Interrupted system call */

#define EIO              5      /* I/O error */

#define ENXIO            6      /* No such device or address */

#define E2BIG            7      /* Arg list too long */

#define ENOEXEC          8      /* Exec format error */

#define EBADF            9      /* Bad file number */

#define ECHILD          10      /* No child processes */

#define EAGAIN          11      /* Try again */

#define ENOMEM          12      /* Out of memory */

#define EACCES          13      /* Permission denied */

#define EFAULT          14      /* Bad address */

#define ENOTBLK         15      /* Block device required */

#define EBUSY           16      /* Device or resource busy */

#define EEXIST          17      /* File exists */

#define EXDEV           18      /* Cross-device link */

#define ENODEV          19      /* No such device */

#define ENOTDIR         20      /* Not a directory */

#define EISDIR          21      /* Is a directory */

#define EINVAL          22      /* Invalid argument */

#define ENFILE          23      /* File table overflow */

#define EMFILE          24      /* Too many open files */

#define ENOTTY          25      /* Not a typewriter */

#define ETXTBSY         26      /* Text file busy */

#define EFBIG           27      /* File too large */

#define ENOSPC          28      /* No space left on device */

#define ESPIPE          29      /* Illegal seek */

#define EROFS           30      /* Read-only file system */

#define EMLINK          31      /* Too many links */

#define EPIPE           32      /* Broken pipe */

#define EDOM            33      /* Math argument out of domain of func */

#define ERANGE          34      /* Math result not representable */

#define EDEADLK         35      /* Resource deadlock would occur */

#define ENAMETOOLONG    36      /* File name too long */

#define ENOLCK          37      /* No record locks available */

#define ENOSYS          38      /* Function not implemented */

#define ENOTEMPTY       39      /* Directory not empty */

#define ELOOP           40      /* Too many symbolic links encountered */

#define EWOULDBLOCK     EAGAIN  /* Operation would block */

#define ENOMSG          42      /* No message of desired type */

#define EIDRM           43      /* Identifier removed */

#define ECHRNG          44      /* Channel number out of range */

#define EL2NSYNC        45      /* Level 2 not synchronized */

#define EL3HLT          46      /* Level 3 halted */

#define EL3RST          47      /* Level 3 reset */

#define ELNRNG          48      /* Link number out of range */

#define EUNATCH         49      /* Protocol driver not attached */

#define ENOCSI          50      /* No CSI structure available */

#define EL2HLT          51      /* Level 2 halted */

#define EBADE           52      /* Invalid exchange */

#define EBADR           53      /* Invalid request descriptor */

#define EXFULL          54      /* Exchange full */

#define ENOANO          55      /* No anode */

#define EBADRQC         56      /* Invalid request code */

#define EBADSLT         57      /* Invalid slot */

#define EDEADLOCK       EDEADLK

#define EBFONT          59      /* Bad font file format */

#define ENOSTR          60      /* Device not a stream */

#define ENODATA         61      /* No data available */

#define ETIME           62      /* Timer expired */

#define ENOSR           63      /* Out of streams resources */

#define ENONET          64      /* Machine is not on the network */

#define ENOPKG          65      /* Package not installed */

#define EREMOTE         66      /* Object is remote */

#define ENOLINK         67      /* Link has been severed */

#define EADV            68      /* Advertise error */

#define ESRMNT          69      /* Srmount error */

#define ECOMM           70      /* Communication error on send */

#define EPROTO          71      /* Protocol error */

#define EMULTIHOP       72      /* Multihop attempted */

#define EDOTDOT         73      /* RFS specific error */

#define EBADMSG         74      /* Not a data message */

#define EOVERFLOW       75      /* Value too large for defined data type */

#define ENOTUNIQ        76      /* Name not unique on network */

#define EBADFD          77      /* File descriptor in bad state */

#define EREMCHG         78      /* Remote address changed */

#define ELIBACC         79      /* Can not access a needed shared library */

#define ELIBBAD         80      /* Accessing a corrupted shared library */

#define ELIBSCN         81      /* .lib section in a.out corrupted */

#define ELIBMAX         82      /* Attempting to link in too many shared libraries */

#define ELIBEXEC        83      /* Cannot exec a shared library directly */

#define EILSEQ          84      /* Illegal byte sequence */

#define ERESTART        85      /* Interrupted system call should be restarted */

#define ESTRPIPE        86      /* Streams pipe error */

#define EUSERS          87      /* Too many users */

#define ENOTSOCK        88      /* Socket operation on non-socket */

#define EDESTADDRREQ    89      /* Destination address required */

#define EMSGSIZE        90      /* Message too long */

#define EPROTOTYPE      91      /* Protocol wrong type for socket */

#define ENOPROTOOPT     92      /* Protocol not available */

#define EPROTONOSUPPORT 93      /* Protocol not supported */

#define ESOCKTNOSUPPORT 94      /* Socket type not supported */

#define EOPNOTSUPP      95      /* Operation not supported on transport endpoint */

#define EPFNOSUPPORT    96      /* Protocol family not supported */

#define EAFNOSUPPORT    97      /* Address family not supported by protocol */

#define EADDRINUSE      98      /* Address already in use */

#define EADDRNOTAVAIL   99      /* Cannot assign requested address */

#define ENETDOWN        100     /* Network is down */

#define ENETUNREACH     101     /* Network is unreachable */

#define ENETRESET       102     /* Network dropped connection because of reset */

#define ECONNABORTED    103     /* Software caused connection abort */

#define ECONNRESET      104     /* Connection reset by peer */

#define ENOBUFS         105     /* No buffer space available */

#define EISCONN         106     /* Transport endpoint is already connected */

#define ENOTCONN        107     /* Transport endpoint is not connected */

#define ESHUTDOWN       108     /* Cannot send after transport endpoint shutdown */

#define ETOOMANYREFS    109     /* Too many references: cannot splice */

#define ETIMEDOUT       110     /* Connection timed out */

#define ECONNREFUSED    111     /* Connection refused */

#define EHOSTDOWN       112     /* Host is down */

#define EHOSTUNREACH    113     /* No route to host */

#define EALREADY        114     /* Operation already in progress */

#define EINPROGRESS     115     /* Operation now in progress */

#define ESTALE          116     /* Stale NFS file handle */

#define EUCLEAN         117     /* Structure needs cleaning */

#define ENOTNAM         118     /* Not a XENIX named type file */

#define ENAVAIL         119     /* No XENIX semaphores available */

#define EISNAM          120     /* Is a named type file */

#define EREMOTEIO       121     /* Remote I/O error */

#define EDQUOT          122     /* Quota exceeded */

#define ENOMEDIUM       123     /* No medium found */

#define EMEDIUMTYPE     124     /* Wrong medium type */

Log Levels

If you look into real kernel code you will always see something like:

printk(KERN_ERR "something went wrong, return code: %d\n",ret);

where "KERN_ERR" is one of the eight different log levels defined in include/linux/kern_levels.h and specifies the severity of the error message.

Note that there is NO comma between the KERN_ERR and the format string (as the preprocessor concatenates both strings)

The log levels are:

KERN_EMERG [0 (pr_emerg)]: Emergency messages, system is about to crash or is unstable.

KERN_ALERT [1 (pr_alert)]: Something bad happened and action must be taken immediately.

KERN_CRIT [2 (pr_crit)]: A critical condition occurred like a serious hardware/software failure.

KERN_ERR [3 (pr_err)]: An error condition, often used by drivers to indicate difficulties with the hardware.

KERN_WARNING [4 (pr_warning)]: A warning, meaning nothing serious by itself but might indicate problems.

KERN_NOTICE [5 (pr_notice)]: Nothing serious, but notably nevertheless. Often used to report security events.

KERN_INFO [6 (pr_info)]: Informational message e.g. startup information at driver initialization.

KERN_DEBUG [7 (pr_debug, pr_devel)]: Debug messages pr_debug, pr_devel if DEBUG is defined.

KERN_DEFAULT [d]: The default kernel loglevel .

KERN_CONT []: "continued" line of log printout (only done after a line that had no enclosing \n)

To determine your current console_loglevel you simply enter:

$ cat /proc/sys/kernel/printk

  7       4       1       7

 current default minimum boot-time-default

The first integer shows you your current console_loglevel; the second the default log level that you have seen above.

To change your current console_loglevel simply write to this file, so in order to get all messages printed to the console do a simple

# echo 8 > /proc/sys/kernel/printk

And every kernel message will appear on your console.

Another way to change the console log level is to use dmesg with the -n parameter

# #set console_loglevel to print KERN_WARNING (4) or more severe messages

# dmesg -n 5

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