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当我运行共享库时，它被执行了。如果没有 main() 程序，这是怎么发生的？开始执行的入口点是什么？

ubuntu@ubuntu:~$ /lib/i386-linux-gnu/libc.so.6

GNU C Library (Ubuntu EGLIBC 2.15-0ubuntu10) stable release version 2.15, by Roland McGrath et al.
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 4.6.3.
Compiled on a Linux 3.2.14 system on 2012-04-19.
Available extensions:
    crypt add-on version 2.1 by Michael Glad and others
    GNU Libidn by Simon Josefsson
    Native POSIX Threads Library by Ulrich Drepper et al
    BIND-8.2.3-T5B
libc ABIs: UNIQUE IFUNC
For bug reporting instructions, please see:
<http://www.debian.org/Bugs/>.
ubuntu@ubuntu:~$
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2 回答 2

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共享库确实具有功能main()；只是大多数人没有。

于 2012-06-30T09:26:09.937 回答
3

-e entry假设您使用 GNU 链接器，您可以使用选项（或--entry=entry长选项符号）指定入口点。

如果您通过 间接调用链接器gcc，请使用-Wl,-e,entry.

于 2012-06-30T09:39:53.960 回答