内容的栏目 * @param int $category 0列表 1频道 2单页 3外链 * @return array */ function category_list($forumlist, $model = 0, $display = 0, $category = 0) { if (empty($forumlist)) return NULL; static $cache = array(); $key = $model . '-' . $display . '-' . $category; if (isset($cache[$key])) return $cache[$key]; if ($display) { foreach ($forumlist as $k => $val) { if (1 == $val['display'] && 1 == $val['type'] && $val['category'] == $category) { $cache[$key][$k] = $val; } } } else { foreach ($forumlist as $k => $val) { if (1 == $val['type'] && $val['category'] == $category) { $cache[$key][$k] = $val; } } } return empty($cache[$key]) ? NULL : $cache[$key]; } /** * @param $forumlist 所有版块列表 不分模型 * @param int $display 0全部CMS栏目 1在首页和频道显示内容的栏目 * @param int $category 0列表 1频道 2单页 3外链 * @return array */ function category_list_show($forumlist, $display = 0, $category = 0) { if (empty($forumlist)) return NULL; static $cache = array(); $key = $display . '-' . $category; if (isset($cache[$key])) return $cache[$key]; if ($display) { foreach ($forumlist as $k => $val) { if (1 == $val['display'] && 1 == $val['type'] && $val['category'] == $category) { $cache[$key][$k] = $val; } } } else { foreach ($forumlist as $k => $val) { if (1 == $val['type'] && $val['category'] == $category) { $cache[$key][$k] = $val; } } } return empty($cache[$key]) ? NULL : $cache[$key]; } /** * @param $forumlist 所有版块列表 * @return mixed BBS栏目数据(仅列表) 尚未开放bbs频道功能 */ function forum_list($forumlist) { if (empty($forumlist)) return array(); static $cache = array(); if (isset($cache['bbs_forum_list'])) return $cache['bbs_forum_list']; $cache['bbs_forum_list'] = array(); foreach ($forumlist as $_fid => $_forum) { if ($_forum['type']) continue; $cache['bbs_forum_list'][$_fid] = $_forum; } return $cache['bbs_forum_list']; } // 导航显示的版块 function nav_list($forumlist) { if (empty($forumlist)) return NULL; static $cache = array(); if (isset($cache['nav_list'])) return $cache['nav_list']; foreach ($forumlist as $fid => $forum) { if (0 == $forum['nav_display']) { unset($forumlist[$fid]); } } return $cache['nav_list'] = $forumlist; } ?>linux - how can I call "systemd-run" "--user" ... from execvp() (in c or c++) without requir

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    你的位置： 首页>programmer>linux - how can I call "systemd-run" "--user" ... from execvp() (in c or c++) without requir

    linux - how can I call "systemd-run" "--user" ... from execvp() (in c or c++) without requir

    programmeradmin0浏览0评论

    When I call systemd-run "--user" "--pipe" "echo" "hello" I get the expected output "hello" (plus some systemd unit info) without a password popup.

    But when I run systemd-run using the exact same arguments from inside a C++ program via execvp() or execvpe() it launches a popup window with Authentication is required to start transient unit.

    Example:

    #include <unistd.h>

int main(int argc, char const* const argv[], char const* const envp[])
    {
        char const* argp[] =
            {
                "--user",
                "--pipe",
                "echo",
                "hello",
                nullptr,
            };
        
        //::execvp("systemd-run", const_cast<char**>(argp)); // alternative call, same result
        ::execvpe("systemd-run", const_cast<char**>(argp), const_cast<char**>(envp));
    }

    Can I avoid this authentication popup requirement (while still using C++)? Preferably using a default systemd with no policy modification.

    (I'm trying to make a quick tool to run a subcommand while preventing accidental file modification outside of specified directories, eg for a "safe" build).

    When I call systemd-run "--user" "--pipe" "echo" "hello" I get the expected output "hello" (plus some systemd unit info) without a password popup.

    But when I run systemd-run using the exact same arguments from inside a C++ program via execvp() or execvpe() it launches a popup window with Authentication is required to start transient unit.

    Example:

    #include <unistd.h>

int main(int argc, char const* const argv[], char const* const envp[])
    {
        char const* argp[] =
            {
                "--user",
                "--pipe",
                "echo",
                "hello",
                nullptr,
            };
        
        //::execvp("systemd-run", const_cast<char**>(argp)); // alternative call, same result
        ::execvpe("systemd-run", const_cast<char**>(argp), const_cast<char**>(envp));
    }

    Can I avoid this authentication popup requirement (while still using C++)? Preferably using a default systemd with no policy modification.

    (I'm trying to make a quick tool to run a subcommand while preventing accidental file modification outside of specified directories, eg for a "safe" build).

    • linux
    • systemd
    Share Improve this question edited Feb 2 at 11:02 Toby Speight 31k50 gold badges76 silver badges113 bronze badges asked Feb 2 at 2:26 xaxazakxaxazak 8307 silver badges19 bronze badges 6
    • Not that I've ever used systemd-run, but have you tried adding the --no-ask-password option that the manual mentions? – tink Commented Feb 2 at 2:32
    • Yes, this just causes Failed to start transient service unit: Interactive authentication required. – xaxazak Commented Feb 2 at 2:36
    • 1 You might want to ask on Unix & Linux. They may be able to explain what criteria it uses to require authentication. – Barmar Commented Feb 2 at 2:44
    • hmm, not possible to transfer this question there I guess. Is it ok to repost? – xaxazak Commented Feb 2 at 2:46
    • @xaxazak You have to run it as root and there will be no popup window. – Lewis Commented Feb 2 at 3:52
     |  Show 1 more comment

    1 Answer 1

    Reset to default 1

    The program is missing in argp, try this :

    #include <unistd.h>

int main(int argc, char const* const argv[], char const* const envp[])
    {
        char const* argp[] =
            {
                "systemd-run", // <=========== notice this.
                "--user",
                "--pipe",
                "echo",
                "hello",
                nullptr,
            };
        
        //::execvp("systemd-run", const_cast<char**>(argp)); // alternative call, same result
        ::execvpe("systemd-run", const_cast<char**>(argp), const_cast<char**>(envp));
    }

    Your version is running this command: systemd-run --pipe echo hello, reason why it asks for password.

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