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Global Variables

The Microsoft run-time library provides the following global variables.

Variable Description
_amblksiz Controls memory heap granularity
daylight, _timezone, _tzname Adjust for local time; used in some date and time functions
_doserrno, errno, _sys_errlist, _sys_nerr Store error codes and related information
_environ, _wenviron Pointers to arrays of pointers to strings that constitute process environment
_fileinfo Specifies whether information regarding open files of a process is passed to new processes
_fmode Sets default file-translation mode
_osver, _winmajor, _winminor, _winver Store build and version numbers of operating system
_pgmptr, _wpgmptr Initialized at program startup to value such as program name, filename, relative path, or full path

See Also

Run-Time Library Reference | Global Constants