Global Variables
The Microsoft C run-time library provides the following global variables or macros. Several of these global variables or macros have been deprecated in favor of more-secure functional versions, which we recommend you use instead of the global variables.
Variable |
Description |
|---|---|
Contains the command-line arguments. |
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Deprecated. Instead, use _get_daylight, _get_dstbias, _get_timezone, and _get_tzname. Adjusts for local time; used in some date and time functions. |
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Deprecated. Instead, use _get_errno, _set_errno, _get_doserrno, _set_doserrno, perror and strerror. Stores error codes and related information. |
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Deprecated. Instead, use getenv_s, _wgetenv_s, _dupenv_s, _wdupenv_s, _putenv_s, and _wputenv_s. Pointers to arrays of pointers to the process environment strings; initialized at startup. |
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Deprecated. Instead, use _get_fmode or _set_fmode. Sets default file-translation mode. |
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Array of I/O control structures for the console, files, and devices. |
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Contains information used by the character-classification functions. |
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Deprecated. Instead, use _get_pgmptr or _get_wpgmptr. Initialized at program startup to the fully-qualified or relative path of the program, the full program name, or the program name without its file name extension, depending on how the program was invoked. |