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 18:26:50
Last Modify:2020-03-17 23:00:47 Copyright©Brick
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函数名称：do_mq_timedreceive

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

返回类型：int

参数：

类型参数名称
mqd_tmqdes
char __user *u_msg_ptr
size_tmsg_len
unsigned int __user *u_msg_prio
struct timespec64 *ts
1091  ktime_t expires, * timeout = NULL
1092  struct posix_msg_tree_node * new_leaf = NULL
1094  如果ts则
1095  expires等于vert a timespec64 to ktime_t format:
1096  timeout等于expires
1099  audit_mq_sendrecv(mqdes, msg_len, 0, ts)
1101  f等于fdget(mqdes)
1102  如果此条件成立可能性小(为编译器优化)(!file)则
1103  ret等于负EBADF
1104  转到:out
1107  inode等于file_inode(file)
1108  如果此条件成立可能性小(为编译器优化)(f_op != & mqueue_file_operations)则
1109  ret等于负EBADF
1110  转到:out_fput
1112  info等于MQUEUE_I(inode)
1113  audit_file(file)
1115  如果此条件成立可能性小(为编译器优化)(!(f_mode & le is open for reading ))则
1116  ret等于负EBADF
1117  转到:out_fput
1121  如果此条件成立可能性小(为编译器优化)(msg_len < maximum message size )则
1122  ret等于负EMSGSIZE
1123  转到:out_fput
1131  如果非node_cache则new_leaf等于开辟内存
1134  加自旋锁
1136  如果非node_cache且new_leaf则
1138  初始化链表头
1139  node_cache等于new_leaf
1140  否则
1141  释放内存
1144  如果 number of messages currently queued 恒等于0则
1145  如果f_flags按位与O_NONBLOCK则
1146  自旋锁解锁
1147  ret等于负EAGAIN
1148  否则
1149  queue of sleeping tasks 等于当前进程
1150  one of STATE_* values 等于STATE_NONE
1151  ret等于Puts current task to sleep. Caller must hold queue lock. After return* lock isn't held.
1152  msg_ptr等于 ptr of loaded message
1154  否则
1157  msg_ptr等于msg_get(info)
1159  i_atime等于i_mtime等于i_ctime等于current_time(inode)
1163  pipelined_receive() - if there is task waiting in sys_mq_timedsend()* gets its message and put to the queue (we have one free place for sure).
1164  自旋锁解锁
1165  wake_up_q( & wake_q)
1166  ret等于0
1168  如果ret恒等于0则
1169  ret等于message text size
1171  如果u_msg_prio且put_user - Write a simple value into user space(m_type, u_msg_prio)或store_msg(u_msg_ptr, msg_ptr, message text size )则
1173  ret等于负EFAULT
1175  free_msg(msg_ptr)
1177  out_fput :
1178  fdput(f)
1179  out :
1180  返回:ret
调用者
名称描述
SYSCALL_DEFINE5