Name 

Description 

O_xxxx #defines 

Header File
fcntl.h
Description
These #defines are bit definitions for a file-access argument.
These RTL file-open functions use some (not all) of these definitions:

• fdopen
• fopen
• freopen
• _fsopen
• open
• _rtl_open
• sopen

sopen also uses file-sharing symbolic constants in the file-access argument.  

_fmode 

Header File
fcntl.h
Syntax
extern int _fmode;
Description
_fmode determines in which mode (text or binary) files will be opened and translated. The value of _fmode is O_TEXT by default, which specifies that files will be read in text mode. If _fmode is set to O_BINARY, the files are opened and read in binary mode. (O_TEXT and O_BINARY are defined in fcntl.h.)
In text mode, carriage-return/linefeed (CR/LF) combinations are translated to a single linefeed character (LF) on input. On output, the reverse is true: LF characters are translated to CR/LF combinations.
In binary mode, no such translation occurs.
You can... more 

_pipe 

Header File
io.h, fcntl.h
Category
Input/output Routines
Syntax
int _pipe(int *handles, unsigned int size, int mode);
Description
Creates a read/write pipe.
The _pipe function creates an anonymous pipe that can be used to pass information between processes. The pipe is opened for both reading and writing. Like a disk file, a pipe can be read from and written to, but it does not have a name or permanent storage associated with it; data written to and from the pipe exist only in a memory buffer managed by the operating system.
The read handle is returned to handles[0], and the write... more 

open, _wopen 

Header File
io.h, fcntl.h
Category
Input/output Routines
Prototype
int open(const char *path, int access [, unsigned mode]);
int _wopen(const wchar_t *path, int access [, unsigned mode]);
Description
Opens a file for reading or writing.
open opens the file specified by path, then prepares it for reading and/or writing as determined by the value of access.
To create a file in a particular mode, you can either assign to the global variable _fmode or call open with the O_CREAT and O_TRUNC options ORed with the translation mode desired.
open("XMP",O_CREAT|O_TRUNC|O_BINARY,S_IREAD)
creates a binary-mode, read-only file named XMP, truncating its length to 0... more 

_sopen, _wsopen 

Header File
fcntl.h, sys\stat.h, share.h, io.h, stdio.h
Category
Input/output Routines
Prototype
int _sopen(char *path, int access, int shflag[, int mode]);
int _wsopen(wchar_t *path, int access, int shflag[, int mode]);
Description
Opens a shared file.
_sopen opens the file given by path and prepares it for shared reading or writing, as determined by access, shflag, and mode.
_wsopen is the Unicode version of _sopen. The Unicode version accepts a filename that is a wchar_t character string. Otherwise, the functions perform identically.
For _sopen, access is constructed by ORing flags bitwise from the following lists:
Read/write flags
You can use only one... more