debian man page for explain_unsetenv_or_die

explain_unsetenv_or_die(3)				     Library Functions Manual					explain_unsetenv_or_die(3)

NAME
       explain_unsetenv_or_die - remove an environment variable and report errors

SYNOPSIS
       #include <libexplain/unsetenv.h>
       void explain_unsetenv_or_die(const char *name);
       int explain_unsetenv_on_error(const char *name);

DESCRIPTION
       The  explain_unsetenv_or_die  function  is  used  to call the unsetenv(3) system call. On failure an explanation will be printed to stderr,
       obtained from the explain_unsetenv(3) function, and then the process terminates by calling exit(EXIT_FAILURE).

       The explain_unsetenv_on_error function is used to call the unsetenv(3) system call. On failure an explanation will be  printed  to  stderr,
       obtained from the explain_unsetenv(3) function, but still returns to the caller.

       name    The name, exactly as to be passed to the unsetenv(3) system call.

RETURN VALUE
       The  explain_unsetenv_or_die  function only returns on success, see unsetenv(3) for more information. On failure, prints an explanation and
       exits, it does not return.

       The explain_unsetenv_on_error function always returns the value return by the wrapped unsetenv(3) system call.

EXAMPLE
       The explain_unsetenv_or_die function is intended to be used in a fashion similar to the following example:
	      explain_unsetenv_or_die(name);

SEE ALSO
       unsetenv(3)
	       change or add an environment variable

       explain_unsetenv(3)
	       explain unsetenv(3) errors

       exit(2) terminate the calling process

COPYRIGHT
       libexplain version 0.52
       Copyright (C) 2010 Peter Miller

															explain_unsetenv_or_die(3)