C using fopen to open any file name portable#
C using fopen to open any file name code#

When a file is opened with a '+' option, you may both read and write on it. When you specify 'r+', you indicate that you want to read the file before you * open file with unique AFT name, remove when done */ * open file 'uid/f' for writing binary */ u generates a unique AFT name for the file if a duplicate name is already in the AFT. If theįile is a temporary file in the AFT under TSS, the file will be removed and thereforeĭeleted. t makes the file Transient, so that it is detached from the job when it is closed. In this instance, the 'filename' argument is a pointer to the string being s tells 'fopen' that you are opening a string for I/O instead of a normal file. If you do not specify this option, the default is to open the fileįor character stream or record processing. Only block mode I/O routines like '_rblock' and '_wblock' may be used The file will be accessed random, no buffer will be allocated for processing SSF records. o opens the file for some purpose 'other' than character or record processing. Not aborted the I/O function that finds the error will return the normal error status (ifĪny) once the message has been printed. Operation or in any I/O performed later on the opened file. e displays an error message (on 'stderr') if an error occurs in the open Occurs in the open operation or in I/O performed later on the opened file.

C using fopen to open any file name portable#

Of C and will not be portable to other implementations.ĭ tells 'fopen' to abort the program (die) with an error message if an error All of the following options are unique to the GCOS-8 version Several additional options can be specified by adding one or more letters to the Will be a sequential file in Media 4 format. The 'b' indicates binary data (as opposed to text) by default, this The stream will be positioned at the end of theĮxisting file content. The stream will be created if it does not exist, and The stream will be positioned at the beginning of theįile. 'options' points to a string containing one of If theįilename has any other format, 'fopen' tries to access it as a permfile. Name of the form 'fc*anything' always refers to a file in the AFT.

C using fopen to open any file name code#

In Batch GCOS,įile code 'XX' can be directly accessed using a filename of 'fc*XX'. Necessary) if 'options' includes 'w' or 'a'. 'name' is the file descriptor for a file. 'fopen' returns a pointer-to-structure if it fails, it returns NULL. 'fopen' opens a file for subsequent reading or writing. Needed for subsequent I/O on the file being opened. This points to a structure that contains information const char *options is a string specifying whether the file should be opened for reading or writing (seeīelow). Where: const char *name is a string containing the name of the file to be opened.