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Linux环境下开发与应用备记

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处理问题要流程

binutils工具

  • 查看动态库内的函数符号.
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aarch64-linux-gnu-readelf --dyn-syms /lib/aarch64-linux-gnu/libssl.so.1.0.0  | grep "TLSv1_2_method"

查看程序链接动态库的依赖.

  • 查看当前系统的程序链接动态库的依赖，可以使用ldd这个工具，ldd -u可以直接列出无法链接到的库名.如果是在交叉编译环境下可以使用
    对应<CROSS_COMPILE>-readelf读取，使用如下:
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~$ aarch64-linux-gnu-readelf -d jtagd | grep "NEEDED"
 0x0000000000000001 (NEEDED)             Shared library: [libccl_ver.so]
 0x0000000000000001 (NEEDED)             Shared library: [libSafeString.so]
 0x0000000000000001 (NEEDED)             Shared library: [libboost_unit_test_framework.so.1.59.0]
 0x0000000000000001 (NEEDED)             Shared library: [libboost_program_options.so.1.59.0]
 0x0000000000000001 (NEEDED)             Shared library: [libboost_system.so.1.59.0]
 0x0000000000000001 (NEEDED)             Shared library: [libboost_filesystem.so.1.59.0]
 0x0000000000000001 (NEEDED)             Shared library: [libboost_serialization.so.1.59.0]
 0x0000000000000001 (NEEDED)             Shared library: [libboost_regex.so.1.59.0]
 0x0000000000000001 (NEEDED)             Shared library: [libnsl.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [librt.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libdl.so.2]
 0x0000000000000001 (NEEDED)             Shared library: [libm.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libgomp.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [ld-linux-x86-64.so.2]

程序长时间运行，无stdout输出的问题

  • 可以使用strace <program>方法运行它，查看它做了那些动作.对于正在运行的程序可以使用strace -p <PID>通过attatch它的
    PID来查看它运行的详情.如果只想查看它的网络相关的调用，可以使用如下命令过虑掉其它信息干扰:
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strace -e trace=network jtagconfig
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=26660, si_uid=1000, si_status=0, si_utime=0, ssi_stime=0} ---
socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 3
setsockopt(3, SOL_TCP, TCP_NODELAY, [1], 4) = 0
setsockopt(3, SOL_SOCKET, SO_LINGER, {l_onoff=1, l_linger=10}, 8) = 0
connect(3, {sa_family=AF_INET, sin_port=htons(1309), sin_addr=inet_addr("127.0.0.1")}, 16) = -1 EINPROGRESS (Operation now in progress)
getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
recvfrom(3, "", 2, 0, NULL, NULL)       = 0
recvfrom(-1, 0x1b066ac, 2, 0, NULL, NULL) = -1 EBADF (Bad file descriptor)
  • GLIBC的兼容问题
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https://stackoverflow.com/questions/2856438/how-can-i-link-to-a-specific-glibc-version
https://stackoverflow.com/questions/4032373/linking-against-an-old-version-of-libc-to-provide-greater-application-coverage/5977518

  • 查看 core dump file

  • 下面错误处理，是没设置正的运行环境变量， 设置export LC_ALL=C就可以解决.

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    : Gtk-WARNING **: Locale not supported by C library.
    Using the fallback 'C' locale.

谢谢支持

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