blocks|key|4616131|text|clone(2)是一个特定于Linux系统调用，它取代了fork(2)系统调用。因此，clone用于在Linux上创建所有“类似进程”的实体(用于创建线程、实现vfork、posix_spawn等等)。基本上，fork等同于带有特定标志的clone。这就是为什么你在strace下看到clone的原因。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4616132|当然，POSIX+fork不会被弃用，也不会消失。所以使用fork不是问题。只有Linux上C库实现使用clone系统调用来实现fork。|4616133|entityMap|0|LINK|mutability|MUTABLE|url|https://man7.org/linux/man-pages/man2/clone.2.html|1|https://man7.org/linux/man-pages/man2/fork.2.html|2|https://pubs.opengroup.org/onlinepubs/9699919799/functions/fork.html^0|0|8|S|7|17|5|2X|4|3B|5|3P|6|3Y|5|0|8|0|S|7|1|0|9|4|T|4|1G|5|1S|4|3|A|2|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]|$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]|$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@$9|18|A|19|1|1A]|$9|1B|A|1C|1|1D]]|E|$]]|$1|F|3|G|5|6|7|1E|8|@$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]]|D|@$9|1N|A|1O|1|1P]]|E|$]]|$1|H|3|-4|5|6|7|1Q|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]|P|$5|K|L|M|E|$N|Q]]|R|$5|K|L|M|E|$N|S]]]]

<a href="https://man7.org/linux/man-pages/man2/clone.2.html" rel="nofollow noreferrer"><code>clone(2)</code></a> is a Linux specific system call that superseded <a href="https://man7.org/linux/man-pages/man2/fork.2.html" rel="nofollow noreferrer"><code>fork(2)</code></a> system call.
So <code>clone</code> is used for creating all the &quot;process-like&quot; entities (for creating threads, implementing vfork, posix_spawn and so on) on Linux.
Basically, <code>fork</code> is equivalent to <code>clone</code> with specific flags. So that's why you see <code>clone</code> under <code>strace</code>.
Of course, the <a href="https://pubs.opengroup.org/onlinepubs/9699919799/functions/fork.html" rel="nofollow noreferrer">POSIX <code>fork</code></a> isn't deprecated and isn't going to disappear. So use of <code>fork</code> isn't an issue. Just that C library implementations on Linux use <code>clone</code> system call to implement <code>fork</code>.

blocks|key|4616109|text|在一些用于Linux的C库(例如GNU+libc或musl-libc)的某些版本中，fork函数实际上是通过调用clone实现的|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4616110|由于这些库是开源，您可以下载它们的源代码并研究(甚至改进源代码)|BOLD|4616111|另请参阅ldd(1)、syscalls(2)、fork(2)、clone(2)、uname(2)、errno(3)、execve(2)、elf(5)、credentials(7)、ld.so(8)等...并阅读|4616112|可能一些C库正在使用clone或fork，这取决于对uname(2)的一些初始调用的结果|4616113|也可以阅读一些good+textbook+on+operating+systems。|4616114|entityMap|0|LINK|mutability|MUTABLE|url|https://www.gnu.org/software/libc/|1|https://musl.libc.org/|2|https://man7.org/linux/man-pages/man1/ldd.1.html|3|https://man7.org/linux/man-pages/man2/syscalls.2.html|4|https://man7.org/linux/man-pages/man2/fork.2.html|5|https://man7.org/linux/man-pages/man2/clone.2.html|6|https://man7.org/linux/man-pages/man2/uname.2.html|7|https://man7.org/linux/man-pages/man3/errno.3.html|8|https://man7.org/linux/man-pages/man2/execve.2.html|9|https://man7.org/linux/man-pages/man5/elf.5.html|10|https://man7.org/linux/man-pages/man7/credentials.7.html|11|https://man7.org/linux/man-pages/man8/ld.so.8.html|12|13|https://pages.cs.wisc.edu/%257Eremzi/OSTEP/^0|16|4|1K|5|G|8|0|P|9|1|0|0|N|0|4|6|2|B|B|3|N|7|4|V|8|5|14|8|6|1D|8|7|1M|9|8|1W|6|9|23|E|A|2I|8|B|0|A|5|G|4|Q|8|C|0|7|Y|D|0^^$0|@$1|2|3|4|5|6|7|1L|8|@$9|1M|A|1N|B|C]|$9|1O|A|1P|B|C]]|D|@$9|1Q|A|1R|1|1S]|$9|1T|A|1U|1|1V]]|E|$]]|$1|F|3|G|5|6|7|1W|8|@$9|1X|A|1Y|B|H]]|D|@]|E|$]]|$1|I|3|J|5|6|7|1Z|8|@]|D|@$9|20|A|21|1|22]|$9|23|A|24|1|25]|$9|26|A|27|1|28]|$9|29|A|2A|1|2B]|$9|2C|A|2D|1|2E]|$9|2F|A|2G|1|2H]|$9|2I|A|2J|1|2K]|$9|2L|A|2M|1|2N]|$9|2O|A|2P|1|2Q]|$9|2R|A|2S|1|2T]]|E|$]]|$1|K|3|L|5|6|7|2U|8|@$9|2V|A|2W|B|C]|$9|2X|A|2Y|B|C]]|D|@$9|2Z|A|30|1|31]]|E|$]]|$1|M|3|N|5|6|7|32|8|@]|D|@$9|33|A|34|1|35]]|E|$]]|$1|O|3|-4|5|6|7|36|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]|W|$5|R|S|T|E|$U|X]]|Y|$5|R|S|T|E|$U|Z]]|10|$5|R|S|T|E|$U|11]]|12|$5|R|S|T|E|$U|13]]|14|$5|R|S|T|E|$U|15]]|16|$5|R|S|T|E|$U|17]]|18|$5|R|S|T|E|$U|19]]|1A|$5|R|S|T|E|$U|1B]]|1C|$5|R|S|T|E|$U|1D]]|1E|$5|R|S|T|E|$U|1F]]|1G|$5|R|S|T|E|$U|1H]]|1I|$5|R|S|T|E|$U|17]]|1J|$5|R|S|T|E|$U|1K]]]]

In some versions of several C libraries for Linux (e.g. <a href="https://www.gnu.org/software/libc/" rel="nofollow noreferrer">GNU libc</a> or <a href="https://musl.libc.org/" rel="nofollow noreferrer">musl-libc</a>), the <code>fork</code> function is actually implemented by a call to <code>clone</code>
Since these libraries are open source, you could download their source code and study it (or even improve that source code)
See also <a href="https://man7.org/linux/man-pages/man1/ldd.1.html" rel="nofollow noreferrer">ldd(1)</a>, <a href="https://man7.org/linux/man-pages/man2/syscalls.2.html" rel="nofollow noreferrer">syscalls(2)</a>, <a href="https://man7.org/linux/man-pages/man2/fork.2.html" rel="nofollow noreferrer">fork(2)</a>, <a href="https://man7.org/linux/man-pages/man2/clone.2.html" rel="nofollow noreferrer">clone(2)</a>, <a href="https://man7.org/linux/man-pages/man2/uname.2.html" rel="nofollow noreferrer">uname(2)</a>, <a href="https://man7.org/linux/man-pages/man3/errno.3.html" rel="nofollow noreferrer">errno(3)</a>, <a href="https://man7.org/linux/man-pages/man2/execve.2.html" rel="nofollow noreferrer">execve(2)</a>, <a href="https://man7.org/linux/man-pages/man5/elf.5.html" rel="nofollow noreferrer">elf(5)</a>, <a href="https://man7.org/linux/man-pages/man7/credentials.7.html" rel="nofollow noreferrer">credentials(7)</a>, <a href="https://man7.org/linux/man-pages/man8/ld.so.8.html" rel="nofollow noreferrer">ld.so(8)</a> etc.... and read <a href="https://mentorembedded.github.io/advancedlinuxprogramming/" rel="nofollow noreferrer">Advanced Linux Programming</a>
Perhaps some C libraries are using <code>clone</code> or <code>fork</code> depending of the result of some initial call to <a href="https://man7.org/linux/man-pages/man2/uname.2.html" rel="nofollow noreferrer">uname(2)</a>
Read also some <a href="https://pages.cs.wisc.edu/%7Eremzi/OSTEP/" rel="nofollow noreferrer">good textbook on operating systems</a>.

Here is my source code
test.c:
<pre class="lang-c prettyprint-override"><code>#include &lt;stdio.h&gt;
#include &lt;unistd.h&gt;
#include &lt;stdlib.h&gt;

int main(){
 pid_t pid;

 pid=fork();
 if(pid==0){
 printf(&quot;new process\n&quot;);
 }else{
 printf(&quot;old process\n&quot;);
 }

 return 0;

}
</code></pre>
I compiled it by:
<pre><code>gcc test.c -o fork
</code></pre>
And I found it make sys_clone() syscall instead of sys_fork() by strace.
<pre><code>$strace -o my ./fork
new process
old process
</code></pre>
<pre><code>$cat my | grep clone
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f459f17d810) = 4415
</code></pre>
<pre><code>$cat my | grep fork
execve(&quot;./fork&quot;, [&quot;./fork&quot;], 0x7ffc76ccbf00 /* 52 vars */) = 0
</code></pre>
see clone() in the scripts? why not fork?

Why I call fork() in C but make sys_clone() syscall instead? Why not sys_fork() syscall?

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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下面是我的源码test.c：#include <stdio.h>#include <unistd.h>#include <stdlib.h>int main(){ pid_t pid; pid=fork(); if(pid==0){ printf("new process\n"); }else{ printf("old process\n");

问为什么我在C中调用fork()而让sys_clone() syscall呢？为什么不使用sys_fork() syscall？
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问为什么我在C中调用fork()而让sys_clone() syscall呢？为什么不使用sys_fork() syscall？EN

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问为什么我在C中调用fork()而让sys_clone() syscall呢？为什么不使用sys_fork() syscall？
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