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hanshenrik
Asked: 2021-11-19 13:04:31 +0800 CST

why is /bin/ls linking to libpthread?

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so strange, is ls multi-threaded somehow? what could ls possibly need libpthread for?

ldd /bin/ls
    linux-vdso.so.1 (0x00007ffff7fce000)
    libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1 (0x00007ffff7f57000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ffff7d65000)
    libpcre2-8.so.0 => /usr/lib/x86_64-linux-gnu/libpcre2-8.so.0 (0x00007ffff7cd2000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007ffff7ccc000)
    /lib64/ld-linux-x86-64.so.2 (0x00007ffff7fcf000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007ffff7ca9000)
shared-library

1 Answers

  1. Best Answer

    It's not ls itself that depends on libpthread. Use lddtree from pax-utils (sudo apt install pax-utils) to see the dependency tree:

    # lddtree /bin/ls
ls => /bin/ls (interpreter => /lib/ld-linux-armhf.so.3)
    libselinux.so.1 => /lib/arm-linux-gnueabihf/libselinux.so.1
        libpcre.so.3 => /lib/arm-linux-gnueabihf/libpcre.so.3
            libpthread.so.0 => /lib/arm-linux-gnueabihf/libpthread.so.0
        libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2
    libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6
    ld-linux-armhf.so.3 => /lib/ld-linux-armhf.so.3

    ldd shows all shared libraries that the file links to, including indirect dependencies.

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