“Unable to open log device '/dev/log/main': No such file or directory”

问题

I am new to Android development and bought a cheap Huawei Sonic (U8650 apparently) so I could test my first attempts at making an app on an actual device.

However, whenever I try to use 'adb logcat' or 'adb shell' then 'logcat' on the device I get:

Unable to open log device '/dev/log/main': No such file or directory

I have already enabled Usb debugging in Settings -> Developer.

I just don't know enough about Android to know if this is something I can even fix.

I have found two other questions with similar problems:

/dev/log/main not found

??-?? ??:??:??.???: INFO/<unknown>(<unknown>): Unable to open log device '/dev/log/main': No such file or directory

...but they both turned out to be using some kind of non standard kernel that had logging disabled. Mine is a stock phone out of the box.

It's a very cheap but snappy Android 2.3 phone, so hopefully it wasn't a total waste of money.

Any help would be greatly appreciated.

回答1:

Dial this: *#*#2846579#*#*
Service menu will appear.
Go to "ProjectMenu" -> "Background Setting" -> "Log Setting"

Open "Log switch" and set it to ON.
Open "Log level setting" and set the log level you wish.

Reboot the phone.

回答2:

1. Open: /system/etc/init.d/××× （not the same file on different ROMs, find the right file）
2. Find the line that says: rm /dev/log/main
3. Change the line to: # rm /dev/log/main (comments out the line, rm = remove, in case you were wondering)
4. Save and reboot

回答3:

I'm sharing my case and solution:

My cellphone had a jellybean version oriented to performance (To be exact a Slim Bean ROM) with a Semaphore kernel (You can recognize it because when the cellphone is starting, the semaphore logo is shown). These kind of ROM have by default disabled the logging so I had to download the Semaphore Manager application (You can download it from here). After that, in the section "Modules" I had to turn on the Logger option as it is shown in the picture

Restart and the logcat should be working now!

回答4:

I have actually found an answer for this finally!

I was having another aimless look to see if anything had been updated about this anywhere and came across a post on xda-developers about a slightly different Huawei device with the same problem.

http://forum.xda-developers.com/showpost.php?p=17774398&postcount=93

It actually worked. I have complete logcat logging on my Huawei Sonic (U8650) now.

Three cheers for not giving up.

---

Solution, copied from the xda (in case it is removed etc):

There is a hidden service-menu where you can set loggin up. The
service-menu is started by "dialing" this phone number:

*#*#2846579#*#*

回答5:

I have a custom rom on my Samsung Captivate, but my approach may work for others as well:

Open up CMD or Terminal and type:

adb shell
logcat-enable
reboot

The rom I have is Continuum v6.1, but this still may work for others.
If you have the terminal emulator on the phone, you also may be able to do:

logcat-enable

and then just reboot the phone. I didn't try that, but it probably would work too. My phone is also rooted - don't know if that makes a difference.

回答6:

it was enough to restart the Huawei device

adb shell
reboot

回答7:

I'm having exactly the same problem. Someone from xda-developers wrote something as follows in msg #33

http://forum.xda-developers.com/showthread.php?t=1169869&page=4

One of the reason it can't be rooted is this phone had removed the "Logcat" mechanism from android. So, this makes most of rooting ways malfunction.

Maybe right maybe wrong i don't know.Anyway it gives some idea about the case.

来源：https://stackoverflow.com/questions/6941710/unable-to-open-log-device-dev-log-main-no-such-file-or-directory