131 Linux Error Codes for C Programming Language using errno
The following C code snippet tries to open a file through open system call. There are two flags in the open call. O_CREAT flag is to create a file, if the file does not exist. O_EXCL flag is used with O_CREAT, if the file is already exist open call will fail with the proper error number.
$ cat fileopen.c #include #include #include #include main() < // Declaration of a file descriptor int fd; // Opening a file fd = open("/root/sasikala/testing",O_CREAT|O_EXCL); // If Open is failed if ( fd < 0 ) < printf("Opening file : Failed\n"); printf ("Error no is : %d\n", errno); printf("Error description is : %s\n",strerror(errno)); >// If Open is success else printf("Opening file : Success\n"); > $ cc -o fileopen fileopen.c $ ./fileopen Opening file : Success $ ./fileopen Opening file : Failed Error no is : 17 Error description is : File exists At first execution, open got executed successfully, and it created the file since the file was not available. In next execution, it throws an error number 17, which is “File already exist”.
The following table shows list of error numbers and its descriptions in Linux operation system
| ERROR CODE TABLE | ||
|---|---|---|
| Error number | Error Code | Error Description |
| 1 | EPERM | Operation not permitted |
| 2 | ENOENT | No such file or directory |
| 3 | ESRCH | No such process |
| 4 | EINTR | Interrupted system call |
| 5 | EIO | I/O error |
| 6 | ENXIO | No such device or address |
| 7 | E2BIG | Argument list too long |
| 8 | ENOEXEC | Exec format error |
| 9 | EBADF | Bad file number |
| 10 | ECHILD | No child processes |
| 11 | EAGAIN | Try again |
| 12 | ENOMEM | Out of memory |
| 13 | EACCES | Permission denied |
| 14 | EFAULT | Bad address |
| 15 | ENOTBLK | Block device required |
| 16 | EBUSY | Device or resource busy |
| 17 | EEXIST | File exists |
| 18 | EXDEV | Cross-device link |
| 19 | ENODEV | No such device |
| 20 | ENOTDIR | Not a directory |
| 21 | EISDIR | Is a directory |
| 22 | EINVAL | Invalid argument |
| 23 | ENFILE | File table overflow |
| 24 | EMFILE | Too many open files |
| 25 | ENOTTY | Not a typewriter |
| 26 | ETXTBSY | Text file busy |
| 27 | EFBIG | File too large |
| 28 | ENOSPC | No space left on device |
| 29 | ESPIPE | Illegal seek |
| 30 | EROFS | Read-only file system |
| 31 | EMLINK | Too many links |
| 32 | EPIPE | Broken pipe |
| 33 | EDOM | Math argument out of domain of func |
| 34 | ERANGE | Math result not representable |
| 35 | EDEADLK | Resource deadlock would occur |
| 36 | ENAMETOOLONG | File name too long |
| 37 | ENOLCK | No record locks available |
| 38 | ENOSYS | Function not implemented |
| 39 | ENOTEMPTY | Directory not empty |
| 40 | ELOOP | Too many symbolic links encountered |
| 42 | ENOMSG | No message of desired type |
| 43 | EIDRM | Identifier removed |
| 44 | ECHRNG | Channel number out of range |
| 45 | EL2NSYNC | Level 2 not synchronized |
| 46 | EL3HLT | Level 3 halted |
| 47 | EL3RST | Level 3 reset |
| 48 | ELNRNG | Link number out of range |
| 49 | EUNATCH | Protocol driver not attached |
| 50 | ENOCSI | No CSI structure available |
| 51 | EL2HLT | Level 2 halted |
| 52 | EBADE | Invalid exchange |
| 53 | EBADR | Invalid request descriptor |
| 54 | EXFULL | Exchange full |
| 55 | ENOANO | No anode |
| 56 | EBADRQC | Invalid request code |
| 57 | EBADSLT | Invalid slot |
| 59 | EBFONT | Bad font file format |
| 60 | ENOSTR | Device not a stream |
| 61 | ENODATA | No data available |
| 62 | ETIME | Timer expired |
| 63 | ENOSR | Out of streams resources |
| 64 | ENONET | Machine is not on the network |
| 65 | ENOPKG | Package not installed |
| 66 | EREMOTE | Object is remote |
| 67 | ENOLINK | Link has been severed |
| 68 | EADV | Advertise error |
| 69 | ESRMNT | Srmount error |
| 70 | ECOMM | Communication error on send |
| 71 | EPROTO | Protocol error |
| 72 | EMULTIHOP | Multihop attempted |
| 73 | EDOTDOT | RFS specific error |
| 74 | EBADMSG | Not a data message |
| 75 | EOVERFLOW | Value too large for defined data type |
| 76 | ENOTUNIQ | Name not unique on network |
| 77 | EBADFD | File descriptor in bad state |
| 78 | EREMCHG | Remote address changed |
| 79 | ELIBACC | Can not access a needed shared library |
| 80 | ELIBBAD | Accessing a corrupted shared library |
| 81 | ELIBSCN | .lib section in a.out corrupted |
| 82 | ELIBMAX | Attempting to link in too many shared libraries |
| 83 | ELIBEXEC | Cannot exec a shared library directly |
| 84 | EILSEQ | Illegal byte sequence |
| 85 | ERESTART | Interrupted system call should be restarted |
| 86 | ESTRPIPE | Streams pipe error |
| 87 | EUSERS | Too many users |
| 88 | ENOTSOCK | Socket operation on non-socket |
| 89 | EDESTADDRREQ | Destination address required |
| 90 | EMSGSIZE | Message too long |
| 91 | EPROTOTYPE | Protocol wrong type for socket |
| 92 | ENOPROTOOPT | Protocol not available |
| 93 | EPROTONOSUPPORT | Protocol not supported |
| 94 | ESOCKTNOSUPPORT | Socket type not supported |
| 95 | EOPNOTSUPP | Operation not supported on transport endpoint |
| 96 | EPFNOSUPPORT | Protocol family not supported |
| 97 | EAFNOSUPPORT | Address family not supported by protocol |
| 98 | EADDRINUSE | Address already in use |
| 99 | EADDRNOTAVAIL | Cannot assign requested address |
| 100 | ENETDOWN | Network is down |
| 101 | ENETUNREACH | Network is unreachable |
| 102 | ENETRESET | Network dropped connection because of reset |
| 103 | ECONNABORTED | Software caused connection abort |
| 104 | ECONNRESET | Connection reset by peer |
| 105 | ENOBUFS | No buffer space available |
| 106 | EISCONN | Transport endpoint is already connected |
| 107 | ENOTCONN | Transport endpoint is not connected |
| 108 | ESHUTDOWN | Cannot send after transport endpoint shutdown |
| 109 | ETOOMANYREFS | Too many references: cannot splice |
| 110 | ETIMEDOUT | Connection timed out |
| 111 | ECONNREFUSED | Connection refused |
| 112 | EHOSTDOWN | Host is down |
| 113 | EHOSTUNREACH | No route to host |
| 114 | EALREADY | Operation already in progress |
| 115 | EINPROGRESS | Operation now in progress |
| 116 | ESTALE | Stale NFS file handle |
| 117 | EUCLEAN | Structure needs cleaning |
| 118 | ENOTNAM | Not a XENIX named type file |
| 119 | ENAVAIL | No XENIX semaphores available |
| 120 | EISNAM | Is a named type file |
| 121 | EREMOTEIO | Remote I/O error |
| 122 | EDQUOT | Quota exceeded |
| 123 | ENOMEDIUM | No medium found |
| 124 | EMEDIUMTYPE | Wrong medium type |
| 125 | ECANCELED | Operation Canceled |
| 126 | ENOKEY | Required key not available |
| 127 | EKEYEXPIRED | Key has expired |
| 128 | EKEYREVOKED | Key has been revoked |
| 129 | EKEYREJECTED | Key was rejected by service |
| 130 | EOWNERDEAD | Owner died |
| 131 | ENOTRECOVERABLE | State not recoverable |
When you see an error number thrown by a C program on a Linux environment, you might find the above table handy to identify what those error number means. Make sure to bookmark this article for future reference.
greggyNapalm / gist:2413028
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| # @see /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 |
| # @see /usr/include/asm-generic/errno.h |
| #ifndef _ASM_GENERIC_ERRNO_H |
| #define _ASM_GENERIC_ERRNO_H |
| #include |
| #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 */ |
| #define ERFKILL 132 /* Operation not possible due to RF-kill */ |
| #endif |