CODEWITHSUNDEEP
androidlinuxlinux-kernelsystem
carl
carl

Reputation: 305

how to check the output of init.rc (init process) in Android platform?

I want to dump stack when some event happened, so I write a script to init.rc as below. Then I use setprop dump_stack 0 and setprop dump_stack 1 to rigger it,but there is no output in my console?

on property:dump_stack=1
       exec /system/bin/cat /proc/100/stack    # pid = 100

I have add some log in system\core\init\builitins.c, it says the code is work (the retstatus is 0). Even I change the script to "exec /system/bin/cat /proc/100/stack > /data/temp", it still doesn't work. So, Where is the output of init.rc (init process)?

PS. The reason I write the script to init.rc is "Permission". The init process is root, so it can dump the stack of others process.

And, is the syntax correct or not? I write the "exec /system/bin/cat /proc/100/stack" by the Android Init Language in http://www.kandroid.org/online-pdk/guide/bring_up.html

Upvotes: 4

Views: 6267

Answers (1)

Frank Meerkötter
Frank Meerkötter

Reputation: 2868

Init is writing to the kernel buffer. You can see its output with dmesg. Make sure to ramp up the loglevel in your init.rc file.

Upvotes: 5

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