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Why do Android apps use MulticastSocket to listen for multicast? Why do they connect to different routes and run on different mobile phones? Some of them cannot receive multicast messages.

and InternetGateway, can be received in the LAN, we only need to sieve out our own messages. However, problems were discovered after small batch launch. Our products cannot listen to multicast messages on some routers. The listening port is silent. Not only do we not receive our own messages, but do not receive multicast messages from other devices in the network. Bring back three problematic routes: 1) linksys, 2) Huawei, 3) ARRIS However, the three

Hard disk first read and write too slow problem

The kernel prints as follows:08-03-11-09-39--SCSI 5:0:0:0: direct-access ARRIS Portable PVR HDD 1A02 pq:0 ansi:608-03-11-09-39--SD 5:0:0:0: [SDD] 976773168 512-byte logical blocks: (gb/465 GiB)08-03-11-09-39--SD 5:0:0:0: [SDD] Write Protect is off08-03-11-09-39--SD 5:0:0:0: [SDD] Mode sense:43 00 00 0008-03-11-09-39--SD 5:0:0:0: Attached SCSI generic sg0 type 008-03-11-09-39--SD 5:0:0:0: [SDD] Write cache:disabled, read cache:enabled, doesn ' t suppor

Understanding Linux Hard links and soft links "go"

old.file├──[789495] soft.link, old.file└──[789497] soft.link.dir-old.dir/Of course, the user data of soft link can also be the path of another soft link, whose parsing process is recursive. However, it is important to note that the path of the original file when the soft link is created is better with absolute path. When a soft link created with a relative path is moved, the soft link file becomes a dead link (the soft link A as shown below uses a relative path and therefore should not be mo

Turn: Understanding hard links and soft links for Linux

. Link:no such file or directory //Create the files that are pointed to old.file,soft.link revert to normal soft links # echo "This was an original file_a" >> Old.file # cat Soft.link This was an original file_a //Create soft links to nonexistent directories # ln-s Old.dir soft.link.dir # MKD Ir-p old.dir/test # tree.-F--inodes . ├──[789497] old.dir/│ └──[789498] test/├──[7894 old.file├──[789495] soft.link, old.file└──[789497] soft.link.dir-old.dir/Of course, the user data of soft

Linux file system soft link hard link

relative path and therefore should not be moved) because the linked data block also points to a relative path.$ ls-li Total 2136 656627 lrwxrwxrwx 1 Harris Harris 8 Sep 1 14:37 A-data.txt 656662 lrwxrwxrwx 1 h Arris Harris 1 Sep 1 14:37 B-a 656228-rw-------1 Harris Harris 2186738 Sep 1 14:37 data.txt 6Link Related commandsIn Linux, view the file system types that are currently hanging on the system, in addition to the command DF use

Understanding hard links and soft links for Linux (pending research)

user data of soft link can also be the path of another soft link, whose parsing process is recursive. However, it is important to note that the path of the original file when the soft link is created is better with absolute path. When a soft link created with a relative path is moved, the soft link file becomes a dead link (the soft link A as shown below uses a relative path and therefore should not be moved) because the linked data block also points to a relative path.$ ls-li Total 2136 6566

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