vdmap unsigned char mmap vdmbuf size PROT READ PROT WRITE MAP SHARED vd fd perrorv4l mmap mmap return Mmap方式下真正做视频截取的VIDIOCMCAPTURE ioctl vd fd VIDIOCMCAPTURE vd mmap 若调用成功 开始一帧的截取 是非阻塞的 是否截取完毕留给VIDIOCSYNC来判断 ioctlvd fd VIDIOCSYNC frame perrorv4l sync VID...
几种进程间的通信方式：管道，FIFO，消息队列，他们的共同特点就是通过内核来进行通信（假设POSIX消息队列...
units */struct file*vm_file;/* File we map to (can be NULL). */void*vm_private_data;/* was vm_pte (shared mem) */#ifndefCONFIG_MMUstruct vm_region*vm_region;/* NOMMU mapping region */#endif #ifdefCONFIG_NUMAstruct mempolicy*vm_policy;/* NUMA policy for the VMA */#endif struc...
rte_free(maps[map_idx].path);return-1; }/** 对 pci/resource0..N 进行 mmap(),将 PCI BAR 空间通过 mmap 的方式映射到进程内部的虚拟空间,供用户态应用来操作设备*/void*pci_map_resource(void*requested_addr,intfd, off_t offset, size_t size,intadditional_flags) {void*mapaddr;//核心便是...
If you want to convert an abstract data type that may impose constraints on the well-formedness of values, you will have to roll your own conversion functions. Use the functions in moduleRead_candWrite_cto map between low-level and high-level representations, or implement those manually for ma...
(fd); return 1; } // Map the file into memory for writing int* writeData = (int*)mmap(NULL, dataSize, PROT_WRITE, MAP_SHARED, fd, 0); if (writeData == MAP_FAILED) { perror("Error mmaping for write"); close(fd); return 1; } // Write some integer data for (int i = 0...
1 Introduction 2 Messages 3 Protocol Details 4 Protocol Examples 5 Security 6 Appendix A: Product Behavior 7 Change Tracking 8 Index Download PDF Save Add to Collections Add to plan Share via Facebookx.comLinkedInEmail Print Article 09/04/2022 ...
capsMediumCacheCellSize (2 bytes): The size, in bytes, of bitmaps in the medium bitmap cache that is allocated on the local node.capsLargeCacheNumEntries (2 bytes): The number of entries in the large bitmap cache that is allocated on the local node....
The development of next generation sequencing technologies promises a massive increase in the rate of submission of new protein sequences to sequence databases such as the Universal Protein Resource Knowledge Base, UniProtKB. At UniProtKB/Swiss-Prot we propose to meet this challenge by continuing to ...
如果是MAP_PRIVATE 情况下文件必须可读,使用MAP_SHARED则要有PROT_WRITE以及该文件要能写入。 分享回复赞 protel吧 jiqimaozaixian 谁可以推荐或者有全面的protel 99原理图和PCB教程,刚开始学,好多不懂 分享回复赞 坦克世界吧 _香風智乃_ 54prot,59,44-100选哪个好啊萌新玩家,看帖子时发现年初44100还挺好评的,...