GetCommandLine的Linux *真实*相当于 [英] GetCommandLine linux *true* equivalent

问题描述

类似的问题到Linux相当于GetCommandLine和CommandLineToArgv的

是否有可能得到的原始的命令在Linux行？文件/ proc /自/ CMDLINE是destroyd。

  ./ a.out的文件=文件1，2档参数=2
 

打印

  ./ a.outfiles =文件1，文件2param = 2
 

这是垃圾

避灾命令行不工作的所有参数，但第一次。

  ./ a.out的文件= \\FIL 1 \\，\\FIL 2 \\\\参数= \\2 \\
 

打印

  ./ a.outfiles =FIL1，FIL2参数=2
 

解决方案

您不能这样做。命令行参数实际上是传递给新的进程作为单独的字符串。看到Linux内核源代码：
kernel_execve

注意 kernel_execve（...）需要为const char * argv的[] - 所以不存在在Linux的一个长字符串命令行这样的东西 - 这是上面的一层需要的参数划分为单独的组件。

编辑：实际上，系统调用是在这里：

excve系统调用

不过，上述声明仍然适用。为argv的参数已经由内核得到它从C库调用exec时间分割。

它是的节目的启动器的责任（通常是壳，但不必是），以产生所述的argv []数组。它会做通配（扩展文件名通配符来它匹配的实际文件）和报价，变量替换的剥离等。

我还要指出的是，虽然有在C库中的执行几个变种，只有一种方式进入内核。所有变种最终会在的execve 系统调用，我联系到上面。其他的变种，只是因为主叫方可以不花哨分裂参数到invdividual元素，所以C库，帮助去做，对于程序员。同样，对于传递一个环境数组的新方案 - 如果程序员不需要特定的环境中，他/她可以叫自动取父进程ENV的变体。

Similar question to Linux equivalent of GetCommandLine and CommandLineToArgv

Is it possible to get the raw command line in linux? The file /proc/self/cmdline is destroyd.

./a.out files="file 1","file 2" param="2"

prints

./a.outfiles=file 1,file 2param=2

which is junk

Escaping command line does work for all arguments but the first.

./a.out files=\"fil 1\",\"fil 2\"\ param=\"2\"

prints

./a.outfiles="fil1","fil2" param="2"

解决方案

You can't do that. The command line arguments are actually passed to the new process as individual strings. See the linux kernel source: kernel_execve

Note that kernel_execve(...) takes a const char *argv[] - so there is no such thing as a long string commandline in Linux - it's the layer above that needs to split the arguments into separate components.

Edit: actually, the system call is here:

excve system call

But the statement above still applies. The parameter for argv is already split by the time the kernel gets it from the C-library call to exec.

It is the responsibility of the "starter of the program" (typically a shell, but doesn't have to be) to produce the argv[] array. It will do the "globbing" (expansion of wildcard filenames to the actual files that it matches) and stripping of quotations, variable replacement and so on.

I would also point out that although there are several variants of "exec" in the C library, there is only one way into the kernel. All variants end up in the execve system call that I linked to above. The other variants are simply because the caller may not fancy splitting arguments into invdividual elements, so the C library "helps out" by doing that for the programmer. Similarly for passing an environment array to the new program - if the programmer don't need specific environment, he/she can just call the variant that automatically take the parent process env.

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