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The C programming language provides many standard library functions for file input and output.These functions make up the bulk of the C standard library header <stdio.h>. [1] The functionality descends from a "portable I/O package" written by Mike Lesk at Bell Labs in the early 1970s, [2] and officially became part of the Unix operating system in Version 7.
For most file systems, a program initializes access to a file in a file system using the open system call. This allocates resources associated to the file (the file descriptor), and returns a handle that the process will use to refer to that file. In some cases the open is performed by the first access.
More generally, Python 2.x specifies the built-in file objects as being “implemented using C's stdio package," [48] and frequent reference is made to C standard library behaviors; the available operations (open, read, write, etc.) are expected to have the same behavior as the corresponding C functions (fopen, fread, fwrite, etc.).
The file descriptor obtained from a call to open(). It is an integer value. It is an integer value. The values 0, 1, 2 can also be given, for standard input, standard output & standard error, respectively .
File exists EXDEV: 18: Invalid cross-device link ENODEV: 19: No such device ENOTDIR: 20: Not a directory EISDIR: 21: Is a directory EINVAL: 22: Invalid argument ENFILE: 23: Too many open files in system EMFILE: 24: Too many open files ENOTTY: 25: Inappropriate ioctl for device ETXTBSY: 26: Text file busy EFBIG: 27: File too large ENOSPC: 28: No ...
In 1988, the command fstat ("file status") appears as part of the 4.3BSD-Tahoe release. Its man page says: [8] fstat identifies open files. A file is considered open if a process has it open, if it is the working directory for a process, or if it is an active pure text file. If no options are specified, fstat reports on all open files.
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an input/output stream that wraps a file stream buffer. Provides functions to open or close a file in addition to those of generic input/output stream fstream – operates on characters of type char; wfstream – operates on characters of type wchar_t; basic_stringstream: an input/output stream that wraps a string stream buffer.