Process::Status#success?

success? → true, false, or nil

static VALUE
pst_success_p(VALUE st)
{
    int status = PST2INT(st);

    if (!WIFEXITED(status))
        return Qnil;
    return RBOOL(WEXITSTATUS(status) == EXIT_SUCCESS);
}

Returns:

true if the process has completed successfully and exited.
false if the process has completed unsuccessfully and exited.
nil if the process has not exited.

See also #stopsig #termsig #stopped? #to_i also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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