函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:ipc\mqueue.c Create Date:2022-07-27 18:26:41
Last Modify:2020-03-17 23:00:47 Copyright©Brick
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函数名称：do_mq_timedsend

函数原型：static int do_mq_timedsend(mqd_t mqdes, const char __user *u_msg_ptr, size_t msg_len, unsigned int msg_prio, struct timespec64 *ts)

返回类型：int

参数：

类型参数名称
mqd_tmqdes
const char __user *u_msg_ptr
size_tmsg_len
unsigned intmsg_prio
struct timespec64 *ts
973  ktime_t expires, * timeout = NULL
974  struct posix_msg_tree_node * new_leaf = NULL
975  ret等于0
978  如果此条件成立可能性小(为编译器优化)(msg_prio >= (unsignedlong)MQ_PRIO_MAX)则返回:负EINVAL
981  如果ts则
982  expires等于vert a timespec64 to ktime_t format:
983  timeout等于expires
986  audit_mq_sendrecv(mqdes, msg_len, msg_prio, ts)
988  f等于fdget(mqdes)
989  如果此条件成立可能性小(为编译器优化)(!file)则
990  ret等于负EBADF
991  转到:out
994  inode等于file_inode(file)
995  如果此条件成立可能性小(为编译器优化)(f_op != & mqueue_file_operations)则
996  ret等于负EBADF
997  转到:out_fput
999  info等于MQUEUE_I(inode)
1000  audit_file(file)
1002  如果此条件成立可能性小(为编译器优化)(!(f_mode & le is open for writing ))则
1003  ret等于负EBADF
1004  转到:out_fput
1007  如果此条件成立可能性小(为编译器优化)(msg_len > maximum message size )则
1008  ret等于负EMSGSIZE
1009  转到:out_fput
1014  msg_ptr等于load_msg(u_msg_ptr, msg_len)
1015  如果是错误则
1016  ret等于错误
1017  转到:out_fput
1019  message text size 等于msg_len
1020  m_type等于msg_prio
1027  如果非node_cache则new_leaf等于开辟内存
1030  加自旋锁
1032  如果非node_cache且new_leaf则
1034  初始化链表头
1035  node_cache等于new_leaf
1036  new_leaf = NULL
1037  否则
1038  释放内存
1041  如果 number of messages currently queued 恒等于 maximum number of messages 则
1042  如果f_flags按位与O_NONBLOCK则
1043  ret等于负EAGAIN
1044  否则
1045  queue of sleeping tasks 等于当前进程
1046  ptr of loaded message 等于msg_ptr
1047  one of STATE_* values 等于STATE_NONE
1048  ret等于Puts current task to sleep. Caller must hold queue lock. After return* lock isn't held.
1053  转到:out_free
1055  否则
1056  receiver等于Returns waiting task that should be serviced first or NULL if none exists
1057  如果receiver则
1058  pipelined_send() - send a message directly to the task waiting in* sys_mq_timedreceive() (without inserting message into a queue).
1059  否则
1061  ret等于Auxiliary functions to manipulate messages' list
1062  如果ret则转到:out_unlock
1064  The next function is only to split too long sys_mq_timedsend
1066  i_atime等于i_mtime等于i_ctime等于current_time(inode)
1069  out_unlock :
1070  自旋锁解锁
1071  wake_up_q( & wake_q)
1072  out_free :
1073  如果ret则free_msg(msg_ptr)
1075  out_fput :
1076  fdput(f)
1077  out :
1078  返回:ret
调用者
名称描述
SYSCALL_DEFINE5