In Linux, find the library in which a function is located.

In Linux, find the library in which a function is located-Linux general technology-Linux programming and kernel information. The following is a detailed description. Regarding how to find out which library file a library function is in, I want to find a work und to find out which library file the fcntl function is in:

1. Find an executable file using fcntl, such as test_fcntl. No. Compile a c file containing only fcntl functions and compile it.

2. Run the "ldd test_fcntl" command to track which library files are used for the executable file. Usually there may be several to dozens.

3. Based on the function to be searched and the name of each database file obtained in the previous step, let's roughly guess which or which database the function may belong.

4. Run the "nm test_fcntl" command to search for the database file obtained in step 3. Generally, you can determine the database in which the fcntl function is located.

For example, I used the above method to find out that the fcntl function is in the "/lib/tls/libc. so.6" library.