在 linux (htop) 上更改线程名称
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change thread name on linux (htop)
提问by Gaetano Mendola
I have a multithread application and I would like that htop (as example) shows a different name per each thread running, at the moment what it shows is the "command line" used to run the main.
我有一个多线程应用程序，我希望 htop（例如）为每个运行的线程显示不同的名称，目前它显示的是用于运行主线程的“命令行”。
I have tried using
我试过使用
prctl(PR_SET_NAME, .....)
but it works only with top and with that call is only possible specify names up to 16 bytes.
但它仅适用于 top 并且该调用只能指定最多 16 个字节的名称。
I guess the trick is to modify the /proc/PID/cmdline content but that is a readonly field.
我想诀窍是修改 /proc/PID/cmdline 内容，但这是一个只读字段。
Anyone knows how to achieve it ?
任何人都知道如何实现它？
回答by llongi
You have to distinguish between per-thread and per-process setting here.
您必须在此处区分每线程和每进程设置。
prctl(PR_SET_NAME, ...) sets the name (up to 16 bytes) on a per-thread basis, and you can force "ps" to show that name with the c switch (ps Hcx for example). You can do the same with the c switch in top, so I assume htop has similar functionality.
prctl(PR_SET_NAME, ...) 在每个线程的基础上设置名称（最多 16 个字节），您可以强制“ps”使用 c 开关显示该名称（例如 ps Hcx）。您可以对 top 中的 c 开关执行相同操作，因此我假设 htop 具有类似的功能。
What "ps" normally shows you (ps Hax for example) is the command line name and arguments you started your program with (indeed what /proc/PID/cmdline tells you), and you can modify those by directly modifying argv[0] (up to its original length), but that is a per-process setting, meaning you cannot give different names to different threads that way.
“ps”通常向您显示（例如 ps Hax）是您启动程序时使用的命令行名称和参数（实际上是 /proc/PID/cmdline 告诉您的），您可以通过直接修改 argv[0] 来修改它们（最多达到其原始长度），但这是每个进程的设置，这意味着您不能以这种方式为不同的线程指定不同的名称。
Following is the code I normally use to change the process name as a whole:
以下是我通常用来整体更改进程名称的代码：
// procname is the new process name
char *procname = "new process name";
// Then let's directly modify the arguments
// This needs a pointer to the original arvg, as passed to main(),
// and is limited to the length of the original argv[0]
size_t argv0_len = strlen(argv[0]);
size_t procname_len = strlen(procname);
size_t max_procname_len = (argv0_len > procname_len) ? (procname_len) : (argv0_len);
// Copy the maximum
strncpy(argv[0], procname, max_procname_len);
// Clear out the rest (yes, this is needed, or the remaining part of the old
// process name will still show up in ps)
memset(&argv[0][max_procname_len], '##代码##', argv0_len - max_procname_len);
// Clear the other passed arguments, optional
// Needs to know argv and argc as passed to main()
//for (size_t i = 1; i < argc; i++) {
// memset(argv[i], '##代码##', strlen(argv[i]));
//}
回答by Drew Noakes
Since version 0.8.4, htophas an option: Show custom thread names
从 0.8.4 版本开始，htop有一个选项：显示自定义线程名称
Press F2and select the Display optionsmenu. You should see:
按F2并选择Display options菜单。你应该看到：
