小编han*_*rik的帖子

我在运行时看到以下内容strace free：

hans@devad22:~$ strace free 2>&1 | grep openat
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libprocps.so.8", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libsystemd.so.0", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/liblzma.so.5", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libzstd.so.1", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/liblz4.so.1", O_RDONLY|O_CLOEXEC) = 3
(...)

为什么免费开放一堆压缩库？free需要什么liblzma？

很奇怪，ls 是多线程的吗？可能需要 libpthread 做什么ls？

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)