Module err 

err.h implementation.

See https://man.freebsd.org/cgi/man.cgi?err

err.h is a BSD extension to the C library which provides functions for printing formatted errors. Errors are printed to stdio::stderr by default or to a file set by err_set_file. This family of functions is non-portable, but it is also supported by glibc and musl.

The functions come in sets of three. Each of them print the program binary name (the last path segment of argv[0]) and an optional user message along with these differences:

• No suffix: Prints an error message for ERRNO based on strerror
• c suffix: Prints an error message for an arbitrary error code
• x suffix: Does not print an error code

For example, err does not have a suffix so it would print the program name, the user message, and an error string for ERRNO. errc would operate in the same way except the functions takes an error code for which to print an error string.

Functions

err^⚠

Print a user message then an error message for ERRNO followed by exiting with eval.

err_set_exit^⚠

Set or remove a callback to invoke before exiting on error.

err_set_file^⚠

Set global FILE sink to write errors and warnings.

errc^⚠

Print a user message then an error message for code before exiting with eval as a return.

errx^⚠

Print a user message then exits with eval as a return.

verr^⚠

See err.

verrc^⚠

See errc.

verrx^⚠

See errx;

vwarn^⚠

See warn.

vwarnc^⚠

See warnc.

vwarnx^⚠

See warnx.

warn^⚠

Print a user message and then an error message for ERRNO.

warnc^⚠

Print a user message then an error message for code.

warnx^⚠

Print a user message as a warning.