File Open Error Codes
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In C programming language, there is no direct support for error handling. You have to detect the failure and handle the error. In C programming language, return values represents success or failure. Inside a C program, when a function fails, you should file error codes in cobol handle the errors accordingly, or at least record the errors in a log file. When you php file error codes are running some program on Linux environment, you might notice that it gives some error number. For example, "Error no is : 17", which batch file error codes doesn't really say much. You really need to know what error number 17 means. This article shows all available error numbers along with it descriptions. This article might be a handy reference for you, when you encounter an error number
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and you would like to know what it means. In C programming language, there is an external variable called "errno". From this errno variable you can use some error handling functions to find out the error description and handle it appropriately. You have to include errno.h header file to use external variable errno. perror function prints error description in standard error. The strerror function returns a string describing the error code passed in the argument errnum. The following C code snippet irs e file error codes 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
"2" are considered "invalid key" messages. 00Successful operation. (Any) 02Key on record just read is duplicated on the next record (Read Next) Or key on record just added is duplicated in the file (Write, Rewrite) In either case the file cra e file error codes allows duplicate keys. 05Optional file is missing. If opened I-O the file was created. If this
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happened on a DELETE FILE then the file was not found. (Open, Delete File) 07Attempted CLOSE REEL on a file that is not on
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tape. Close was successful. (Close) 0MSuccessful operation but some optional feature was not used or supported. (Any) 10End of file. (Read Next) 14Attempted sequential read on a relative file and relative key is too large. (Read Next) 21Primary key written http://www.thegeekstuff.com/2010/10/linux-error-codes out of sequence or primary key on a rewrite does not match that of last record read. Only for indexed files opened sequentially. (Write, Rewrite) 22Duplicate key found but not allowed. (Write, Rewrite) 23Record not found. (Read) 24Disk full. (Write, Rewrite) 24,01Sequential write to a relative file and the relative key is too big. (Write) 30,nnPermanent error reported by the operating system. nn will be set to an operating system status value. (Any) 34Disk full for sequential file or sort file. http://web.cse.ohio-state.edu/~sgomori/314/filerr.html (Write, Sort) 35File not found. (Open, Sort) 37,01File being opened is not on the appropriate storage device for the mode it is being opened. (Open) 37,07User does not authority to access the file. (Open) 37,08Attempted open of print file for input. (Open) 37,09Attempted open of a sequential file as I-O. (Open) 37,99A Windows or NT run-time operation that is not network-enabled attempted to access a file on a remote machine. (Any) 38File previously closed with LOCK. (Open) 39,nnFile attributes do not match COBOL description. (Open) nn: 01 - Mismatch detected but source unknown. 02 - Mismatch with maximum record size. 03 - Mismatch with minimum record size. 04 - Mismatch with number of keys. 05 - Mismatch with primary key description. 06 - Mismatch with 1st alternate key description. 07 - Mismatch with 2nd alternate key description. List continues with each alternate key. 41File already open. (Open) 42File not open. (Close, Unlock) 43No current record. (Rewrite, Delete) 44Record size changed and file does not allow it. (Rewrite) Also can happen if record does not conform to the RECORD CONTAINS clause in the program (Write, Rewrite). 46No current record. Either did not issue a START or it failed. (Read Next) Note that is error code can be generated with sequential files if an item in the FD is accessed before the 1st record is read or after the end of file was reached. 47,01File not open for input or I-O
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