Your C compiler library contains a low-level file function called sopen() that can be used to open a file in shared mode. Beginning with DOS 3.0, files could be opened in shared mode by loading a special program named SHARE.EXE. Shared mode, as the name implies, allows a file to be shared with other programs as well as your own. Using this function, you can allow other programs that are running to update the same file you are updating. The sopen() function takes four parameters: a pointer to the filename you want to open, the operationalmode you want to open the file in, the file sharing mode to use, and, if you are creating a file, the mode to create the file in. The second parameter of the sopen() function, usually referred to as the 'operation flag' parameter, can have the following values assigned to it: Constant Description O_APPEND Appends all writes to the end of the fileO_BINARY Opens the file in binary (untranslated) modeO_CREAT If the file does not exist, it is createdO_EXCL If the O_CREAT flag is used and the file exists, returns an errorO_RDONLY Opens the file in read-only modeO_RDWR Opens the file for reading and writingO_TEXT Opens the file in text (translated) modeO_TRUNC Opens an existing file and writes over its contentsO_WRONLY Opens the file in write-only modeThe third parameter of the sopen() function, usually referred to as the 'sharing flag,' can have the following values assigned to it:Constant DescriptionSH_COMPAT No other program can access the fileSH_DENYRW No other program can read from or write to the fileSH_DENYWR No other program can write to the fileSH_DENYRD No other program can read from the fileSH_DENYNO Any program can read from or write to the fileIf the sopen() function is successful, it returns a non-negative number that is the file?s handle. If an error occurs, '1 is returned, and the global variable errno is set to one of the following values:Constant DescriptionENOENT File or path not foundEMFILE No more file handles are availableEACCES Permission denied to access fileEINVACC Invalid access codeConstant Description
C
Topic: Files
How can I open a file so that other programs can update it at the same time?
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