In Linux, we can set the environmental variable LD_LIBRARY_PATH to specify the library path for application to search the shared libraries. But in some case, we could use another method to specify the library path instead of setting the variable. The Linux ELF program loader /lib/ld-linux.so.2 could help us complete this. Just lanuch this file directly, and the output is shown as following: $ /lib/ld-linux.so.2 Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...] You have invoked `ld.so', the helper program for shared library executables. This program usually lives in the file `/lib/ld.so', and special directives in executable files using ELF shared libraries tell the system's program loader to load the helper program from this file. This helper program loads the shared libraries needed by the program executable, prepares the program to run, and runs it. You may invoke this helper program directly from the command line to load and run an ELF executable file; this is like executing that file itself, but always uses this helper program from the file you specified, instead of the helper program file specified in the executable file you run. This is mostly of use for maintainers to test new versions of this helper program; chances are you did not intend to run this program. --list list all dependencies and how they are resolved --verify verify that given object really is a dynamically linked object we can handle --library-path PATH use given PATH instead of content of the environment variable LD_LIBRARY_PATH --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names in LIST From the output, we can see that the option --library-path could help us specify the PATH to search shared librarys. Given that we have a binary hello, which linked a shared library libhello.so which locates in the folder /home/abc/lib, we can execute following command to launch the binary hello: /lib/ld-linux.so.2 --library-path /lib:/usr/lib:/home/abc/lib hello |
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