errno.h - C Error Codes in Linux

All the Linux/C error codes are listed below.

I occasionally google C error codes, but always end up grepping through /usr/include to find the answer. To save myself, and a few others, some time in the future...

/usr/include/asm-generic/errno-base.h

 #ifndef _ASM_GENERIC_ERRNO_BASE_H
 #define _ASM_GENERIC_ERRNO_BASE_H

 #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  /* Argument 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 */

 #endif

/usr/include/asm-generic/errno.h

 #ifndef _ASM_GENERIC_ERRNO_H
 #define _ASM_GENERIC_ERRNO_H

 #include <asm-generic/errno-base.h>

 #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 */
 #define ECANCELED   125 /* Operation Canceled */
 #define ENOKEY      126 /* Required key not available */
 #define EKEYEXPIRED 127 /* Key has expired */
 #define EKEYREVOKED 128 /* Key has been revoked */
 #define EKEYREJECTED    129 /* Key was rejected by service */

 /* for robust mutexes */
 #define EOWNERDEAD  130 /* Owner died */
 #define ENOTRECOVERABLE 131 /* State not recoverable */

 #endif