Linux mq_notify信号通知与sighand_struct
Linux mq_notify信号通知与sighand_struct
mq_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：
```c
struct 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：
```c
int 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：
```c
static 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：
```c
static 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：
```c
struct 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_THREAD，glibc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。
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mq_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：
```c
struct 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：
```c
int 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：
```c
static 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：
```c
static 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：
```c
struct 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_THREAD，glibc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。
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