Linux 7.0报错”Check if the DISPLAY variable is set. Failed”,请检查DISPLAY变量是否设置。 问题描述 在使用Linux 7.0操作系统时,可能会遇到一个报错信息:“Check if the DISPLAY variable is set. Failed”,这个报错通常是由于图形界面无法正常显示导致的,本文将详细介绍如何解决这个问题。 原因分析 1、DISPLAY变...
struct address_space *mapping,当 mapping 为 NULL 时,该 page 为交换缓存(swap);当 mapping 不为 NULL 且第 0 位为 0,该 page 为页缓存或文件映射,mapping 指向文件的地址空间;当 mapping 不为 NULL 且第 0 位为 1,该 page 为匿名页(匿名映射),mapping 指向 struct anon_vma 对象 pgoff_t index,映...
In programming, it is essential to check if a variable is “set” or “not set,” which means you have to check if a bash script variable has a value or not. This check helps for effective data validation. However, there’s no built-in function for checking empty variables in bash sc...
= 0) continue; if (tasks.empty()) continue; pthread_mutex_lock(&mymutex); pTask = tasks.front(); tasks.pop_front(); pthread_mutex_unlock(&mymutex); pTask->doTask(); delete pTask; } return NULL; } void* producer_thread(void* param) { int taskID = 0; Task* pTask = NULL; ...
* Set up numa_mem percpu variable for on-line cpus. During * boot, only the boot cpu should be on-line; we'll init the * secondary cpus' numa_mem as they come on-line. During * node/memory hotplug, we'll fixup all on-line cpus. ...
struct epoll_event{__uint32_t events;/* Epoll events */epoll_data_t data;/* User data variable */};events 描述事件类型,具体类型有:EPOLLIN:表示对应的文件描述符可读EPOLLOUT:表示对应的文件描述符可写EPOLLPRI:表示对应的文件描述符有紧急的数据可读EPOLLERR:表示对应的文件描述符发生错误EPOLLHUP:表示...
(CVE-2022-0847) caused by an uninitialized* "pipe_buffer.flags" variable. It demonstrates how to overwrite any* file contents in the page cache, even if the file is not permitted* to be written, immutable or on a read-only mount.** This exploit requires Linux 5.8 or later; the code ...
defined(CONFIG_ENABLE_ARM_SOC_BOOT0_HOOK) */#if !CONFIG_IS_ENABLED(SYS_NO_VECTOR_TABLE)/*** Indirect vectors table** Symbols referenced here must be defined somewhere else***/.globl _reset.globl _undefined_instruction /* 未定义指令异常 */.globl _software_interrupt /* 软中断异常 */.glob...
pool->queues = (threadpool_task_t*) (& pool->thread_ctxs[thread_count]);/* Initialize mutex and conditional variable first */if((pthread_mutex_init(&(pool->lock),NULL) !=0) || (pthread_cond_init(&(pool->notify),NULL) !=0)) {gotoerr; ...
static inline int ip_finish_output2(struct sk_buff *skb){/* variable declarations */if (rt->rt_type == RTN_MULTICAST) {IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUTMCAST, skb->len);} else if (rt->rt_type == RTN_BROADCAST)IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUTBCAS...