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Using open to open a file in JNI returns a - 1 problem

2022-04-23 13:19:00 【Johnny2004】 

fd = open("/dev/test", O_RDWR|O_NOCTTY/*|O_NDELAY*/);

problem : Open the node , Always returns -1

One , Check dev/ Whether the node permission is open or not. Give permission

chmod 777 /dev/test

Code can be found in

init.rc Add permissions to

/dev/test 0666 system system

Second, check whether there is a system mode problem getenforce

console:/ # getenforce

Permissive

If not Permissive The pattern is Enforcing So modify Enforcing by Permissive

console:/ # setenforce 0

Modify the file in the code set_config Add 

setenv bootargs androidboot.selinux=permissive

3、 ... and If the system is Enforcing You can view the mode in the system without modifying it .te  Add corresponding permissions to the file

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本文为[Johnny2004]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/04/202204230608014916.html

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