SIMPLE SOLUTIONS

EXPLAIN_UNSETENV_OR_DIE - reference manual online

Remove an environment variable and report errors.

Chapter
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 fail‐ ure an explanation will be printed to stderr, obtained from the explain_unsetenv(3) func‐ tion, 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
explain_unsetenv_or_die(3)
This manual Reference Other manuals
explain_unsetenv_or_die(3) referred by explain(3) | explain_unsetenv(3)
refer to _exit(2) | explain_unsetenv(3) | setenv(3)