blocks|key|2137130|text|(这个答案是LINUX/GLIBC特有的)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2137131|根据http://s.eresi-project.org/inc/articles/elf-rtld.txt|offset|length|2137132|有link_map+*map；map->l_map_start+&+map->l_map_end|2137133|++++/*+
++++++++**+Start+and+finish+of+memory+map+for+this+object.++
++++**+l_map_start+need+not+be+the+same+as+l_addr.++
++++*/
++++ElfW(Addr)+l_map_start,+l_map_end;|code-block|syntax|javascript|2137134|这有点不准确，正如这里所说的，http://www.cygwin.com/ml/libc-hacker/2007-06/msg00014.html+=有些库在内存中不连续；链接的字母有一些示例.例如，这是要检测的内部(to+rtld)函数，它是库地址空间中给定的地址，它基于link_map并直接使用ELF段：|2137135|/*+Return+non-zero+if+ADDR+lies+within+one+of+L's+segments.++*/
int
internal_function
_dl_addr_inside_object+(struct+link_map+*l,+const+ElfW(Addr)+addr)
{
++int+n+=+l->l_phnum;
++const+ElfW(Addr)+reladdr+=+addr+-+l->l_addr;

++while+(--n+>=+0)
++++if+(l->l_phdr[n].p_type+==+PT_LOAD
++++&&+reladdr+-+l->l_phdr[n].p_vaddr+>=+0
++++&&+reladdr+-+l->l_phdr[n].p_vaddr+<+l->l_phdr[n].p_memsz)
++++++return+1;
++return+0;
}|2137136|此函数是另一种选择，即查找加载的ELF的程序头/或节头(在link_map中有一些指向此类信息的链接)。|2137137|最简单的方法是使用stat+syscall和map->l_name+-从磁盘读取文件大小(在检测巨大的bss部分时不准确)。|style|CODE|2137138|entityMap|0|LINK|mutability|MUTABLE|url|http://s.eresi-project.org/inc/articles/elf-rtld.txt|1|http://www.cygwin.com/ml/libc-hacker/2007-06/msg00014.html^0|0|2|1G|0|0|0|0|F|1M|1|0|0|0|9|4|M|B|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@]|9|@$D|18|E|19|1|1A]]|A|$]]|$1|F|3|G|5|6|7|1B|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|1C|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1D|8|@]|9|@$D|1E|E|1F|1|1G]]|A|$]]|$1|O|3|P|5|J|7|1H|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|1I|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1J|8|@$D|1K|E|1L|U|V]|$D|1M|E|1N|U|V]]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]|14|$5|Z|10|11|A|$12|15]]]]

(This answer is LINUX/GLIBC specific)

According to <a href="http://s.eresi-project.org/inc/articles/elf-rtld.txt" rel="nofollow">http://s.eresi-project.org/inc/articles/elf-rtld.txt</a> 

there are link_map *map; map->l_map_start &amp; map->l_map_end

<pre><code> /* 
 ** Start and finish of memory map for this object. 
 ** l_map_start need not be the same as l_addr. 
 */
 ElfW(Addr) l_map_start, l_map_end;
</code></pre>

It is a bit not exact, as said here <a href="http://www.cygwin.com/ml/libc-hacker/2007-06/msg00014.html" rel="nofollow">http://www.cygwin.com/ml/libc-hacker/2007-06/msg00014.html</a>
= some libraries are not continous in memory; the letter linked has some examples... e.g. this is the very internal (to rtld) function to detect is the given address inside lib's address space or not, based on link_map and direct working with ELF segments:

<pre><code>/* Return non-zero if ADDR lies within one of L's segments. */
int
internal_function
_dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr)
{
 int n = l-&gt;l_phnum;
 const ElfW(Addr) reladdr = addr - l-&gt;l_addr;

 while (--n &gt;= 0)
 if (l-&gt;l_phdr[n].p_type == PT_LOAD
 &amp;&amp; reladdr - l-&gt;l_phdr[n].p_vaddr &gt;= 0
 &amp;&amp; reladdr - l-&gt;l_phdr[n].p_vaddr &lt; l-&gt;l_phdr[n].p_memsz)
 return 1;
 return 0;
}
</code></pre>

And this function is the Other alternative, which is to find program headers/ or section headers of ELF loaded (there are some links to such information in link_map)

And the easiest is to use some <code>stat</code> syscall with <code>map-&gt;l_name</code> - to read file size from the disk (inexact in detecting huge bss section).

blocks|key|144312|text|解析/proc/self/maps+(或者可能是popen-ing+a+pmap命令)对我来说仍然是最简单的事情。还有dladdr函数(前提是您有一些附加条件)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|144313|entityMap|0|LINK|mutability|MUTABLE|url|http://linux.die.net/man/3/dladdr^0|2|F|O|5|10|4|1N|6|1N|6|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@$9|W|A|X|1|Y]]|E|$]]|$1|F|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

Parsing <code>/proc/self/maps</code> (or perhaps <code>popen</code>-ing a <code>pmap</code> command) seems still the easiest thing to me. And there is also the <a href="http://linux.die.net/man/3/dladdr" rel="nofollow"><code>dladdr</code></a> function (provided you have some adress to start with).

I'm dynamically loading some Linux libraries in C. 
I can get the start addresses of the libraries using the 

<blockquote>
 dlinfo
</blockquote>

(see <a href="http://compute.cnr.berkeley.edu/cgi-bin/man-cgi?dlinfo%203" rel="nofollow">1</a>).

I can't find any information to get the size of a library, however.

The only thing that I've found is that one must read the 

<blockquote>
 /proc/[pid]/maps 
</blockquote>

file and parse it for the relevant information (see <a href="http://web.hexapodia.org/~adi/pmap.c" rel="nofollow">2</a>). 
Is there a more elegant method?

How to view Linux memory map info in C?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我在C中动态加载一些Linux库，我可以使用德林佛(见)。然而，我找不到任何信息来获取库的大小。我发现的唯一一件事是你必须阅读/proc/pid/map文件并解析它以获取相关信息(请参阅)。有没有更优雅的方法？

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