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
1 #ifndef _ASM_GENERIC_ERRNO_BASE_H 2 #define _ASM_GENERIC_ERRNO_BASE_H 3 4 #define EPERM 1 /* Operation not permitted */ 5 #define ENOENT 2 /* No such file or directory */ 6 #define ESRCH 3 /* No such process */ 7 #define EINTR 4 /* Interrupted system call */ 8 #define EIO 5 /* I/O error */ 9 #define ENXIO 6 /* No such device or address */ 10 #define E2BIG 7 /* Argument list too long */ 11 #define ENOEXEC 8 /* Exec format error */ 12 #define EBADF 9 /* Bad file number */ 13 #define ECHILD 10 /* No child processes */ 14 #define EAGAIN 11 /* Try again */ 15 #define ENOMEM 12 /* Out of memory */ 16 #define EACCES 13 /* Permission denied */ 17 #define EFAULT 14 /* Bad address */ 18 #define ENOTBLK 15 /* Block device required */ 19 #define EBUSY 16 /* Device or resource busy */ 20 #define EEXIST 17 /* File exists */ 21 #define EXDEV 18 /* Cross-device link */ 22 #define ENODEV 19 /* No such device */ 23 #define ENOTDIR 20 /* Not a directory */ 24 #define EISDIR 21 /* Is a directory */ 25 #define EINVAL 22 /* Invalid argument */ 26 #define ENFILE 23 /* File table overflow */ 27 #define EMFILE 24 /* Too many open files */ 28 #define ENOTTY 25 /* Not a typewriter */ 29 #define ETXTBSY 26 /* Text file busy */ 30 #define EFBIG 27 /* File too large */ 31 #define ENOSPC 28 /* No space left on device */ 32 #define ESPIPE 29 /* Illegal seek */ 33 #define EROFS 30 /* Read-only file system */ 34 #define EMLINK 31 /* Too many links */ 35 #define EPIPE 32 /* Broken pipe */ 36 #define EDOM 33 /* Math argument out of domain of func */ 37 #define ERANGE 34 /* Math result not representable */ 38 39 #endif
/usr/include/asm-generic/errno.h
1 #ifndef _ASM_GENERIC_ERRNO_H 2 #define _ASM_GENERIC_ERRNO_H 3 4 #include <asm-generic/errno-base.h> 5 6 #define EDEADLK 35 /* Resource deadlock would occur */ 7 #define ENAMETOOLONG 36 /* File name too long */ 8 #define ENOLCK 37 /* No record locks available */ 9 #define ENOSYS 38 /* Function not implemented */ 10 #define ENOTEMPTY 39 /* Directory not empty */ 11 #define ELOOP 40 /* Too many symbolic links encountered */ 12 #define EWOULDBLOCK EAGAIN /* Operation would block */ 13 #define ENOMSG 42 /* No message of desired type */ 14 #define EIDRM 43 /* Identifier removed */ 15 #define ECHRNG 44 /* Channel number out of range */ 16 #define EL2NSYNC 45 /* Level 2 not synchronized */ 17 #define EL3HLT 46 /* Level 3 halted */ 18 #define EL3RST 47 /* Level 3 reset */ 19 #define ELNRNG 48 /* Link number out of range */ 20 #define EUNATCH 49 /* Protocol driver not attached */ 21 #define ENOCSI 50 /* No CSI structure available */ 22 #define EL2HLT 51 /* Level 2 halted */ 23 #define EBADE 52 /* Invalid exchange */ 24 #define EBADR 53 /* Invalid request descriptor */ 25 #define EXFULL 54 /* Exchange full */ 26 #define ENOANO 55 /* No anode */ 27 #define EBADRQC 56 /* Invalid request code */ 28 #define EBADSLT 57 /* Invalid slot */ 29 30 #define EDEADLOCK EDEADLK 31 32 #define EBFONT 59 /* Bad font file format */ 33 #define ENOSTR 60 /* Device not a stream */ 34 #define ENODATA 61 /* No data available */ 35 #define ETIME 62 /* Timer expired */ 36 #define ENOSR 63 /* Out of streams resources */ 37 #define ENONET 64 /* Machine is not on the network */ 38 #define ENOPKG 65 /* Package not installed */ 39 #define EREMOTE 66 /* Object is remote */ 40 #define ENOLINK 67 /* Link has been severed */ 41 #define EADV 68 /* Advertise error */ 42 #define ESRMNT 69 /* Srmount error */ 43 #define ECOMM 70 /* Communication error on send */ 44 #define EPROTO 71 /* Protocol error */ 45 #define EMULTIHOP 72 /* Multihop attempted */ 46 #define EDOTDOT 73 /* RFS specific error */ 47 #define EBADMSG 74 /* Not a data message */ 48 #define EOVERFLOW 75 /* Value too large for defined data type */ 49 #define ENOTUNIQ 76 /* Name not unique on network */ 50 #define EBADFD 77 /* File descriptor in bad state */ 51 #define EREMCHG 78 /* Remote address changed */ 52 #define ELIBACC 79 /* Can not access a needed shared library */ 53 #define ELIBBAD 80 /* Accessing a corrupted shared library */ 54 #define ELIBSCN 81 /* .lib section in a.out corrupted */ 55 #define ELIBMAX 82 /* Attempting to link in too many shared libraries */ 56 #define ELIBEXEC 83 /* Cannot exec a shared library directly */ 57 #define EILSEQ 84 /* Illegal byte sequence */ 58 #define ERESTART 85 /* Interrupted system call should be restarted */ 59 #define ESTRPIPE 86 /* Streams pipe error */ 60 #define EUSERS 87 /* Too many users */ 61 #define ENOTSOCK 88 /* Socket operation on non-socket */ 62 #define EDESTADDRREQ 89 /* Destination address required */ 63 #define EMSGSIZE 90 /* Message too long */ 64 #define EPROTOTYPE 91 /* Protocol wrong type for socket */ 65 #define ENOPROTOOPT 92 /* Protocol not available */ 66 #define EPROTONOSUPPORT 93 /* Protocol not supported */ 67 #define ESOCKTNOSUPPORT 94 /* Socket type not supported */ 68 #define EOPNOTSUPP 95 /* Operation not supported on transport endpoint */ 69 #define EPFNOSUPPORT 96 /* Protocol family not supported */ 70 #define EAFNOSUPPORT 97 /* Address family not supported by protocol */ 71 #define EADDRINUSE 98 /* Address already in use */ 72 #define EADDRNOTAVAIL 99 /* Cannot assign requested address */ 73 #define ENETDOWN 100 /* Network is down */ 74 #define ENETUNREACH 101 /* Network is unreachable */ 75 #define ENETRESET 102 /* Network dropped connection because of reset */ 76 #define ECONNABORTED 103 /* Software caused connection abort */ 77 #define ECONNRESET 104 /* Connection reset by peer */ 78 #define ENOBUFS 105 /* No buffer space available */ 79 #define EISCONN 106 /* Transport endpoint is already connected */ 80 #define ENOTCONN 107 /* Transport endpoint is not connected */ 81 #define ESHUTDOWN 108 /* Cannot send after transport endpoint shutdown */ 82 #define ETOOMANYREFS 109 /* Too many references: cannot splice */ 83 #define ETIMEDOUT 110 /* Connection timed out */ 84 #define ECONNREFUSED 111 /* Connection refused */ 85 #define EHOSTDOWN 112 /* Host is down */ 86 #define EHOSTUNREACH 113 /* No route to host */ 87 #define EALREADY 114 /* Operation already in progress */ 88 #define EINPROGRESS 115 /* Operation now in progress */ 89 #define ESTALE 116 /* Stale NFS file handle */ 90 #define EUCLEAN 117 /* Structure needs cleaning */ 91 #define ENOTNAM 118 /* Not a XENIX named type file */ 92 #define ENAVAIL 119 /* No XENIX semaphores available */ 93 #define EISNAM 120 /* Is a named type file */ 94 #define EREMOTEIO 121 /* Remote I/O error */ 95 #define EDQUOT 122 /* Quota exceeded */ 96 97 #define ENOMEDIUM 123 /* No medium found */ 98 #define EMEDIUMTYPE 124 /* Wrong medium type */ 99 #define ECANCELED 125 /* Operation Canceled */ 100 #define ENOKEY 126 /* Required key not available */ 101 #define EKEYEXPIRED 127 /* Key has expired */ 102 #define EKEYREVOKED 128 /* Key has been revoked */ 103 #define EKEYREJECTED 129 /* Key was rejected by service */ 104 105 /* for robust mutexes */ 106 #define EOWNERDEAD 130 /* Owner died */ 107 #define ENOTRECOVERABLE 131 /* State not recoverable */ 108 109 #endif