# err.h ## **Overview** **Related Modules:** [IO](IO.md) **Description:** Provides common functions for error messages. You can use the functions provided in this file to implement error output operations required during development. **Since:** 1.0 **Version:** 1.0 ## **Summary** ## Functions

Function Name

Description

warn (const char *fmt,...)

void 

Displays a formatted error message on the standard error (stderr) output.

vwarn (const char *fmt, va_list args)

void 

Displays a formatted error message on the stderr output.

warnx (const char *fmt,...)

void 

Displays a formatted error message on the stderr output.

vwarnx (const char *fmt, va_list args)

void 

Displays a formatted error message on the stderr output.

err (int eval, const char *fmt, va_list args)

void 

Displays error information.

errx (int eval, const char *fmt,...)

void 

Displays error information.

verr (int eval, const char *fmt, va_list args)

void 

Displays error information.

verrx (int eval, const char *fmt, va_list args)

void 

Displays a formatted error message.