Linux mq_notify信号通知与sighand_structmq_notify系统调用允许进程注册在POSIX消息队列从空变为非空时的通知。内核入口为SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, const struct sigevent __user *, u_notification)。其核心流程是将用户态struct sigevent拷贝到内核将通知配置写入mqueue_inode_info的notify字段并在通知触发时通过sigaddset向目标进程发送信号。用户传入的struct sigevent决定通知方式cstruct sigevent {int sigev_notify; /* SIGEV_SIGNAL / SIGEV_THREAD / SIGEV_NONE */int sigev_signo; /* 信号编号 */union sigval sigev_value; /* 伴随数据 */void (*sigev_notify_function)(union sigval);void *sigev_notify_attributes;};内核处理路径cint do_mq_notify(mqd_t mqdes, const struct sigevent *notification){struct fd f fdget(mqdes);struct mqueue_inode_info *info;struct sigevent *notify_ptr;int ret 0;if (!f.file)return -EBADF;info MQUEUE_I(file_inode(f.file));if (notification) {/* 注册通知 */struct sigevent n;int ret copy_from_user(n, notification, sizeof(n));if (info-notify_owner info-notify_owner ! current-tgid)return -EBUSY;switch (n.sigev_notify) {case SIGEV_SIGNAL:/* 验证信号编号有效性 */if (!valid_signal(n.sigev_signo))return -EINVAL;break;case SIGEV_NONE:break;case SIGEV_THREAD:/* 需要用户态辅助线程机制实际由C库处理 */break;default:return -EINVAL;}info-notify n;info-notify_owner current-tgid;} else {/* 取消通知 */info-notify.sigev_notify SIGEV_NONE;info-notify_owner 0;}fdput(f);return 0;}通知触发的时机在do_mq_timedsend中当消息插入后检测到队列之前为空且有注册通知cstatic void __do_notify(struct mqueue_inode_info *info){if (info-notify.sigev_notify SIGEV_SIGNAL) {struct task_struct *task;struct siginfo info_sig;rcu_read_lock();task find_task_by_vpid(info-notify_owner);if (task) {memset(info_sig, 0, sizeof(info_sig));info_sig.si_signo info-notify.sigev_signo;info_sig.si_errno 0;info_sig.si_code SI_MESGQ;info_sig.si_value info-notify.sigev_value;info_sig.si_pid task_tgid_vnr(current);info_sig.si_uid from_kuid_munged(current_user_ns(), current_uid());/* 发送信号 */send_sig_info(info-notify.sigev_signo,info_sig, task);}rcu_read_unlock();}/* 通知只触发一次下次需要重新注册 */info-notify.sigev_notify SIGEV_NONE;info-notify_owner 0;}关键数据结构是sighand_struct。当信号通过send_sig_info发送时内核调用__send_signal它会将信号挂入目标进程的sigpending队列并通过sigaddset在pending信号集中设置对应位cstatic int __send_signal(int sig, struct siginfo *info, struct task_struct *t,int group, int from_ancestor_ns){struct sigpending *pending;struct sighand_struct *sighand;rcu_read_lock();sighand rcu_dereference(t-sighand);pending group ? t-signal-shared_pending : t-pending;...sigaddset(pending-signal, sig);...complete_signal(sig, t, group);rcu_read_unlock();return 0;}sighand_struct的定义cstruct sighand_struct {spinlock_t siglock;refcount_t count;struct k_sigaction action[_NSIG]; /* 每个信号对应的处理动作 */};当目标进程从内核态返回用户态时do_signal或arch_do_signal遍历pending信号集找到sigev_signo对应的k_sigaction执行用户注册的信号处理函数。用户态信号处理函数通过sigaction注册的sa_handler被调用sigev_value通过siginfo的si_value传递给处理函数。SIGEV_THREAD由glibc的用户态线程辅助机制实现内核在mq_notify中不做线程创建。对于SIGEV_THREADglibc在内部创建线程并调用sigev_notify_function传入sigev_value。内核仅对SIGEV_SIGNAL路径进行实际信号投递。每个inode同一时间只允许一个通知注册者当info-notify_owner非零时新的注册请求返回EBUSY。通知是一次性的触发后自动清零需要在每次接收后重新注册。多个接收者可以同时阻塞在wait_q上等待消息但只有等队列变空再变非空时才会触发新通知。pic.gksju.cn/19113.Docpic.gksju.cn/42026.Docpic.gksju.cn/80280.Docpic.gksju.cn/84626.Docpic.gksju.cn/46485.Docpic.gksju.cn/60200.Docpic.gksju.cn/48004.Docpic.gksju.cn/86260.Docpic.gksju.cn/44442.Docpic.gksju.cn/66448.Docpix.gksju.cn/42620.Docpix.gksju.cn/88886.Docpix.gksju.cn/08042.Docpix.gksju.cn/24044.Docpix.gksju.cn/40804.Docpix.gksju.cn/22648.Docpix.gksju.cn/48020.Docpix.gksju.cn/82486.Docpix.gksju.cn/44688.Docpix.gksju.cn/48248.Docpiz.gksju.cn/00026.Docpiz.gksju.cn/42266.Docpiz.gksju.cn/86460.Docpiz.gksju.cn/88088.Docpiz.gksju.cn/82624.Docpiz.gksju.cn/64808.Docpiz.gksju.cn/22848.Docpiz.gksju.cn/88020.Docpiz.gksju.cn/04686.Docpiz.gksju.cn/26884.Docpil.gksju.cn/84226.Docpil.gksju.cn/06060.Docpil.gksju.cn/68262.Docpil.gksju.cn/42844.Docpil.gksju.cn/04664.Docpil.gksju.cn/64200.Docpil.gksju.cn/64882.Docpil.gksju.cn/28466.Docpil.gksju.cn/42668.Docpil.gksju.cn/08064.Docpik.gixrq.cn/40860.Docpik.gixrq.cn/80088.Docpik.gixrq.cn/40808.Docpik.gixrq.cn/20284.Docpik.gixrq.cn/60426.Docpik.gixrq.cn/66686.Docpik.gixrq.cn/02424.Docpik.gixrq.cn/84284.Docpik.gixrq.cn/64628.Docpik.gixrq.cn/64060.Docpij.gixrq.cn/40000.Docpij.gixrq.cn/60000.Docpij.gixrq.cn/20022.Docpij.gixrq.cn/42224.Docpij.gixrq.cn/62488.Docpij.gixrq.cn/02004.Docpij.gixrq.cn/40286.Docpij.gixrq.cn/64800.Docpij.gixrq.cn/80446.Docpij.gixrq.cn/68400.Docpih.gixrq.cn/44414.Docpih.gixrq.cn/68644.Docpih.gixrq.cn/00820.Docpih.gixrq.cn/32673.Docpih.gixrq.cn/82242.Docpih.gixrq.cn/32608.Docpih.gixrq.cn/20842.Docpih.gixrq.cn/02062.Docpih.gixrq.cn/42048.Docpih.gixrq.cn/82488.Docpig.gixrq.cn/60204.Docpig.gixrq.cn/68082.Docpig.gixrq.cn/40246.Docpig.gixrq.cn/20482.Docpig.gixrq.cn/42428.Docpig.gixrq.cn/26408.Docpig.gixrq.cn/08424.Docpig.gixrq.cn/40042.Docpig.gixrq.cn/04408.Docpig.gixrq.cn/24800.Docpif.gixrq.cn/88606.Docpif.gixrq.cn/42864.Docpif.gixrq.cn/04686.Docpif.gixrq.cn/68044.Docpif.gixrq.cn/00446.Docpif.gixrq.cn/48000.Docpif.gixrq.cn/06668.Docpif.gixrq.cn/26028.Docpif.gixrq.cn/80224.Docpif.gixrq.cn/46468.Docpid.gixrq.cn/04442.Docpid.gixrq.cn/24604.Docpid.gixrq.cn/06448.Docpid.gixrq.cn/80400.Docpid.gixrq.cn/88206.Docpid.gixrq.cn/80664.Docpid.gixrq.cn/46262.Docpid.gixrq.cn/42488.Docpid.gixrq.cn/88262.Docpid.gixrq.cn/80442.Docpis.gixrq.cn/40664.Docpis.gixrq.cn/22424.Docpis.gixrq.cn/66608.Docpis.gixrq.cn/24408.Docpis.gixrq.cn/08642.Docpis.gixrq.cn/66880.Docpis.gixrq.cn/28400.Docpis.gixrq.cn/86604.Docpis.gixrq.cn/66480.Docpis.gixrq.cn/46042.Docpia.gixrq.cn/22242.Docpia.gixrq.cn/82608.Docpia.gixrq.cn/06282.Docpia.gixrq.cn/40664.Docpia.gixrq.cn/60820.Docpia.gixrq.cn/80862.Docpia.gixrq.cn/20266.Docpia.gixrq.cn/20644.Docpia.gixrq.cn/06860.Docpia.gixrq.cn/86868.Docpip.gixrq.cn/46040.Docpip.gixrq.cn/06464.Docpip.gixrq.cn/22202.Docpip.gixrq.cn/85044.Docpip.gixrq.cn/82600.Docpip.gixrq.cn/40688.Docpip.gixrq.cn/86662.Docpip.gixrq.cn/86800.Docpip.gixrq.cn/08206.Docpip.gixrq.cn/88608.Docpio.gixrq.cn/86604.Docpio.gixrq.cn/04862.Docpio.gixrq.cn/28062.Docpio.gixrq.cn/22060.Docpio.gixrq.cn/28444.Docpio.gixrq.cn/48820.Docpio.gixrq.cn/00228.Docpio.gixrq.cn/26646.Docpio.gixrq.cn/86644.Docpio.gixrq.cn/24440.Docpii.gixrq.cn/64864.Docpii.gixrq.cn/24466.Docpii.gixrq.cn/28424.Docpii.gixrq.cn/20408.Docpii.gixrq.cn/60402.Docpii.gixrq.cn/20624.Docpii.gixrq.cn/84464.Docpii.gixrq.cn/42886.Docpii.gixrq.cn/46606.Docpii.gixrq.cn/68646.Docpiu.gixrq.cn/84062.Docpiu.gixrq.cn/40868.Docpiu.gixrq.cn/00424.Docpiu.gixrq.cn/40608.Docpiu.gixrq.cn/28802.Docpiu.gixrq.cn/86226.Docpiu.gixrq.cn/48204.Docpiu.gixrq.cn/84468.Docpiu.gixrq.cn/68886.Docpiu.gixrq.cn/86884.Docpiy.gixrq.cn/84808.Docpiy.gixrq.cn/22084.Docpiy.gixrq.cn/62262.Docpiy.gixrq.cn/42686.Docpiy.gixrq.cn/82040.Docpiy.gixrq.cn/08264.Docpiy.gixrq.cn/80882.Docpiy.gixrq.cn/86666.Docpiy.gixrq.cn/24444.Docpiy.gixrq.cn/60684.Docpit.gixrq.cn/84206.Docpit.gixrq.cn/97413.Docpit.gixrq.cn/60280.Docpit.gixrq.cn/81036.Docpit.gixrq.cn/44886.Docpit.gixrq.cn/08480.Docpit.gixrq.cn/64286.Docpit.gixrq.cn/40880.Docpit.gixrq.cn/80406.Docpit.gixrq.cn/02066.Docpir.gixrq.cn/66280.Docpir.gixrq.cn/82800.Docpir.gixrq.cn/28643.Docpir.gixrq.cn/04080.Docpir.gixrq.cn/04042.Docpir.gixrq.cn/24515.Docpir.gixrq.cn/60040.Docpir.gixrq.cn/04026.Docpir.gixrq.cn/68408.Docpir.gixrq.cn/04844.Docpie.gixrq.cn/64486.Docpie.gixrq.cn/65464.Docpie.gixrq.cn/06884.Docpie.gixrq.cn/88884.Docpie.gixrq.cn/02028.Docpie.gixrq.cn/44622.Docpie.gixrq.cn/42642.Docpie.gixrq.cn/00666.Docpie.gixrq.cn/04404.Docpie.gixrq.cn/66428.Docpiw.gixrq.cn/06666.Docpiw.gixrq.cn/42602.Docpiw.gixrq.cn/64042.Docpiw.gixrq.cn/26864.Docpiw.gixrq.cn/82240.Docpiw.gixrq.cn/80286.Docpiw.gixrq.cn/82202.Docpiw.gixrq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Linux mq_notify信号通知与sighand_struct
发布时间：2026/6/15 2:44:12
Linux mq_notify信号通知与sighand_structmq_notify系统调用允许进程注册在POSIX消息队列从空变为非空时的通知。内核入口为SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, const struct sigevent __user *, u_notification)。其核心流程是将用户态struct sigevent拷贝到内核将通知配置写入mqueue_inode_info的notify字段并在通知触发时通过sigaddset向目标进程发送信号。用户传入的struct sigevent决定通知方式cstruct sigevent {int sigev_notify; /* SIGEV_SIGNAL / SIGEV_THREAD / SIGEV_NONE */int sigev_signo; /* 信号编号 */union sigval sigev_value; /* 伴随数据 */void (*sigev_notify_function)(union sigval);void *sigev_notify_attributes;};内核处理路径cint do_mq_notify(mqd_t mqdes, const struct sigevent *notification){struct fd f fdget(mqdes);struct mqueue_inode_info *info;struct sigevent *notify_ptr;int ret 0;if (!f.file)return -EBADF;info MQUEUE_I(file_inode(f.file));if (notification) {/* 注册通知 */struct sigevent n;int ret copy_from_user(n, notification, sizeof(n));if (info-notify_owner info-notify_owner ! current-tgid)return -EBUSY;switch (n.sigev_notify) {case SIGEV_SIGNAL:/* 验证信号编号有效性 */if (!valid_signal(n.sigev_signo))return -EINVAL;break;case SIGEV_NONE:break;case SIGEV_THREAD:/* 需要用户态辅助线程机制实际由C库处理 */break;default:return -EINVAL;}info-notify n;info-notify_owner current-tgid;} else {/* 取消通知 */info-notify.sigev_notify SIGEV_NONE;info-notify_owner 0;}fdput(f);return 0;}通知触发的时机在do_mq_timedsend中当消息插入后检测到队列之前为空且有注册通知cstatic void __do_notify(struct mqueue_inode_info *info){if (info-notify.sigev_notify SIGEV_SIGNAL) {struct task_struct *task;struct siginfo info_sig;rcu_read_lock();task find_task_by_vpid(info-notify_owner);if (task) {memset(info_sig, 0, sizeof(info_sig));info_sig.si_signo info-notify.sigev_signo;info_sig.si_errno 0;info_sig.si_code SI_MESGQ;info_sig.si_value info-notify.sigev_value;info_sig.si_pid task_tgid_vnr(current);info_sig.si_uid from_kuid_munged(current_user_ns(), current_uid());/* 发送信号 */send_sig_info(info-notify.sigev_signo,info_sig, task);}rcu_read_unlock();}/* 通知只触发一次下次需要重新注册 */info-notify.sigev_notify SIGEV_NONE;info-notify_owner 0;}关键数据结构是sighand_struct。当信号通过send_sig_info发送时内核调用__send_signal它会将信号挂入目标进程的sigpending队列并通过sigaddset在pending信号集中设置对应位cstatic int __send_signal(int sig, struct siginfo *info, struct task_struct *t,int group, int from_ancestor_ns){struct sigpending *pending;struct sighand_struct *sighand;rcu_read_lock();sighand rcu_dereference(t-sighand);pending group ? t-signal-shared_pending : t-pending;...sigaddset(pending-signal, sig);...complete_signal(sig, t, group);rcu_read_unlock();return 0;}sighand_struct的定义cstruct sighand_struct {spinlock_t siglock;refcount_t count;struct k_sigaction action[_NSIG]; /* 每个信号对应的处理动作 */};当目标进程从内核态返回用户态时do_signal或arch_do_signal遍历pending信号集找到sigev_signo对应的k_sigaction执行用户注册的信号处理函数。用户态信号处理函数通过sigaction注册的sa_handler被调用sigev_value通过siginfo的si_value传递给处理函数。SIGEV_THREAD由glibc的用户态线程辅助机制实现内核在mq_notify中不做线程创建。对于SIGEV_THREADglibc在内部创建线程并调用sigev_notify_function传入sigev_value。内核仅对SIGEV_SIGNAL路径进行实际信号投递。每个inode同一时间只允许一个通知注册者当info-notify_owner非零时新的注册请求返回EBUSY。通知是一次性的触发后自动清零需要在每次接收后重新注册。多个接收者可以同时阻塞在wait_q上等待消息但只有等队列变空再变非空时才会触发新通知。pic.gksju.cn/19113.Docpic.gksju.cn/42026.Docpic.gksju.cn/80280.Docpic.gksju.cn/84626.Docpic.gksju.cn/46485.Docpic.gksju.cn/60200.Docpic.gksju.cn/48004.Docpic.gksju.cn/86260.Docpic.gksju.cn/44442.Docpic.gksju.cn/66448.Docpix.gksju.cn/42620.Docpix.gksju.cn/88886.Docpix.gksju.cn/08042.Docpix.gksju.cn/24044.Docpix.gksju.cn/40804.Docpix.gksju.cn/22648.Docpix.gksju.cn/48020.Docpix.gksju.cn/82486.Docpix.gksju.cn/44688.Docpix.gksju.cn/48248.Docpiz.gksju.cn/00026.Docpiz.gksju.cn/42266.Docpiz.gksju.cn/86460.Docpiz.gksju.cn/88088.Docpiz.gksju.cn/82624.Docpiz.gksju.cn/64808.Docpiz.gksju.cn/22848.Docpiz.gksju.cn/88020.Docpiz.gksju.cn/04686.Docpiz.gksju.cn/26884.Docpil.gksju.cn/84226.Docpil.gksju.cn/06060.Docpil.gksju.cn/68262.Docpil.gksju.cn/42844.Docpil.gksju.cn/04664.Docpil.gksju.cn/64200.Docpil.gksju.cn/64882.Docpil.gksju.cn/28466.Docpil.gksju.cn/42668.Docpil.gksju.cn/08064.Docpik.gixrq.cn/40860.Docpik.gixrq.cn/80088.Docpik.gixrq.cn/40808.Docpik.gixrq.cn/20284.Docpik.gixrq.cn/60426.Docpik.gixrq.cn/66686.Docpik.gixrq.cn/02424.Docpik.gixrq.cn/84284.Docpik.gixrq.cn/64628.Docpik.gixrq.cn/64060.Docpij.gixrq.cn/40000.Docpij.gixrq.cn/60000.Docpij.gixrq.cn/20022.Docpij.gixrq.cn/42224.Docpij.gixrq.cn/62488.Docpij.gixrq.cn/02004.Docpij.gixrq.cn/40286.Docpij.gixrq.cn/64800.Docpij.gixrq.cn/80446.Docpij.gixrq.cn/68400.Docpih.gixrq.cn/44414.Docpih.gixrq.cn/68644.Docpih.gixrq.cn/00820.Docpih.gixrq.cn/32673.Docpih.gixrq.cn/82242.Docpih.gixrq.cn/32608.Docpih.gixrq.cn/20842.Docpih.gixrq.cn/02062.Docpih.gixrq.cn/42048.Docpih.gixrq.cn/82488.Docpig.gixrq.cn/60204.Docpig.gixrq.cn/68082.Docpig.gixrq.cn/40246.Docpig.gixrq.cn/20482.Docpig.gixrq.cn/42428.Docpig.gixrq.cn/26408.Docpig.gixrq.cn/08424.Docpig.gixrq.cn/40042.Docpig.gixrq.cn/04408.Docpig.gixrq.cn/24800.Docpif.gixrq.cn/88606.Docpif.gixrq.cn/42864.Docpif.gixrq.cn/04686.Docpif.gixrq.cn/68044.Docpif.gixrq.cn/00446.Docpif.gixrq.cn/48000.Docpif.gixrq.cn/06668.Docpif.gixrq.cn/26028.Docpif.gixrq.cn/80224.Docpif.gixrq.cn/46468.Docpid.gixrq.cn/04442.Docpid.gixrq.cn/24604.Docpid.gixrq.cn/06448.Docpid.gixrq.cn/80400.Docpid.gixrq.cn/88206.Docpid.gixrq.cn/80664.Docpid.gixrq.cn/46262.Docpid.gixrq.cn/42488.Docpid.gixrq.cn/88262.Docpid.gixrq.cn/80442.Docpis.gixrq.cn/40664.Docpis.gixrq.cn/22424.Docpis.gixrq.cn/66608.Docpis.gixrq.cn/24408.Docpis.gixrq.cn/08642.Docpis.gixrq.cn/66880.Docpis.gixrq.cn/28400.Docpis.gixrq.cn/86604.Docpis.gixrq.cn/66480.Docpis.gixrq.cn/46042.Docpia.gixrq.cn/22242.Docpia.gixrq.cn/82608.Docpia.gixrq.cn/06282.Docpia.gixrq.cn/40664.Docpia.gixrq.cn/60820.Docpia.gixrq.cn/80862.Docpia.gixrq.cn/20266.Docpia.gixrq.cn/20644.Docpia.gixrq.cn/06860.Docpia.gixrq.cn/86868.Docpip.gixrq.cn/46040.Docpip.gixrq.cn/06464.Docpip.gixrq.cn/22202.Docpip.gixrq.cn/85044.Docpip.gixrq.cn/82600.Docpip.gixrq.cn/40688.Docpip.gixrq.cn/86662.Docpip.gixrq.cn/86800.Docpip.gixrq.cn/08206.Docpip.gixrq.cn/88608.Docpio.gixrq.cn/86604.Docpio.gixrq.cn/04862.Docpio.gixrq.cn/28062.Docpio.gixrq.cn/22060.Docpio.gixrq.cn/28444.Docpio.gixrq.cn/48820.Docpio.gixrq.cn/00228.Docpio.gixrq.cn/26646.Docpio.gixrq.cn/86644.Docpio.gixrq.cn/24440.Docpii.gixrq.cn/64864.Docpii.gixrq.cn/24466.Docpii.gixrq.cn/28424.Docpii.gixrq.cn/20408.Docpii.gixrq.cn/60402.Docpii.gixrq.cn/20624.Docpii.gixrq.cn/84464.Docpii.gixrq.cn/42886.Docpii.gixrq.cn/46606.Docpii.gixrq.cn/68646.Docpiu.gixrq.cn/84062.Docpiu.gixrq.cn/40868.Docpiu.gixrq.cn/00424.Docpiu.gixrq.cn/40608.Docpiu.gixrq.cn/28802.Docpiu.gixrq.cn/86226.Docpiu.gixrq.cn/48204.Docpiu.gixrq.cn/84468.Docpiu.gixrq.cn/68886.Docpiu.gixrq.cn/86884.Docpiy.gixrq.cn/84808.Docpiy.gixrq.cn/22084.Docpiy.gixrq.cn/62262.Docpiy.gixrq.cn/42686.Docpiy.gixrq.cn/82040.Docpiy.gixrq.cn/08264.Docpiy.gixrq.cn/80882.Docpiy.gixrq.cn/86666.Docpiy.gixrq.cn/24444.Docpiy.gixrq.cn/60684.Docpit.gixrq.cn/84206.Docpit.gixrq.cn/97413.Docpit.gixrq.cn/60280.Docpit.gixrq.cn/81036.Docpit.gixrq.cn/44886.Docpit.gixrq.cn/08480.Docpit.gixrq.cn/64286.Docpit.gixrq.cn/40880.Docpit.gixrq.cn/80406.Docpit.gixrq.cn/02066.Docpir.gixrq.cn/66280.Docpir.gixrq.cn/82800.Docpir.gixrq.cn/28643.Docpir.gixrq.cn/04080.Docpir.gixrq.cn/04042.Docpir.gixrq.cn/24515.Docpir.gixrq.cn/60040.Docpir.gixrq.cn/04026.Docpir.gixrq.cn/68408.Docpir.gixrq.cn/04844.Docpie.gixrq.cn/64486.Docpie.gixrq.cn/65464.Docpie.gixrq.cn/06884.Docpie.gixrq.cn/88884.Docpie.gixrq.cn/02028.Docpie.gixrq.cn/44622.Docpie.gixrq.cn/42642.Docpie.gixrq.cn/00666.Docpie.gixrq.cn/04404.Docpie.gixrq.cn/66428.Docpiw.gixrq.cn/06666.Docpiw.gixrq.cn/42602.Docpiw.gixrq.cn/64042.Docpiw.gixrq.cn/26864.Docpiw.gixrq.cn/82240.Docpiw.gixrq.cn/80286.Docpiw.gixrq.cn/82202.Docpiw.gixrq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