函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\bpf\arraymap.c Create Date:2022-07-27 14:27:47
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：ly called from syscall

函数原型：int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value)

返回类型：int

参数：

类型参数名称
struct bpf_map *map
void *key
u32 *value
554  ret等于0
556  如果非map_fd_sys_lookup_elem则返回:负Operation is not supported
559  _read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other
560  elem等于Called from syscall or from eBPF program
561  如果elem且ptr等于READ_ONCE( * elem)则value等于map_fd_sys_lookup_elem(ptr)
563  否则ret等于负ENOENT
565  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
567  返回:ret
调用者
名称描述
map_lookup_elem