如何仅针对特定应用程序更改核心模式？ [英] How to change core pattern only for a particular application?

问题描述

我的应用程序要求以特定模式生成核心文件。

My application requires the core file to be generated in a specific pattern.

如何在不影响其他流程的情况下做到这一点？

How do I do this without affecting other processes?

当/ proc为只读时，该怎么办？

And how do I do this when /proc is read-only?

推荐答案

man核心告诉我们：

将核心转储到程序中

Piping core dumps to a program

从2.6.19内核开始，Linux支持
/ proc / sys / kernel / core_pattern 文件。如果此
文件的第一个字符是管道符号（ | ），则该行的其余部分为
，解释为要执行的程序。核心转储不是写入
a磁盘文件，而是作为程序的标准输入提供。

Since kernel 2.6.19, Linux supports an alternate syntax for the /proc/sys/kernel/core_pattern file. If the first character of this file is a pipe symbol (|), then the remainder of the line is interpreted as a program to be executed. Instead of being written to a disk file, the core dump is given as standard input to the program.

请注意以下几点：

• 必须使用绝对路径名（或相对于根目录/的
  路径名）指定程序，并且必须立即使用
  跟随'|'字符。

• The program must be specified using an absolute pathname (or a pathname relative to the root directory, /), and must immediately follow the '|' character.

为运行该程序而创建的进程以用户和组
根用户身份运行。

The process created to run the program runs as user and group root.

可以向程序提供命令行参数（自Linux
2.6.24起），由空格分隔（最大行长为$ b $） b 128字节）。

Command-line arguments can be supplied to the program (since Linux 2.6.24), delimited by white space (up to a total line length of 128 bytes).

命令行参数可以包括上面列出的%%
中的任何一个。例如，要传递正在转储
的进程的PID，请在参数中指定％p。

The command-line arguments can include any of the % specifiers listed above. For example, to pass the PID of the process that is being dumped, specify %p in an argument.

您可以在此处放置脚本，例如

You can put a script there, like e.g.

| /path/to/myscript %p %s %c

您可以检测到哪个进程正在触发coredump ：（（ man core ）：

You can detect which process is triggering the coredump: (man core):

       %%  a single % character
       %p  PID of dumped process
       %u  (numeric) real UID of dumped process
       %g  (numeric) real GID of dumped process
       %s  number of signal causing dump
       %t  time of dump, expressed as seconds since the Epoch,  1970-01-01
           00:00:00 +0000 (UTC)
       %h  hostname (same as nodename returned by uname(2))
       %e  executable filename (without path prefix)
       %E  pathname of executable, with slashes ('/') replaced by exclama‐
           tion marks ('!').
       %c  core file size soft resource limit of crashing  process  (since
           Linux 2.6.24)

现在您要做的就是为您自己以外的其他进程做默认操作

Now all you have to do is "do the default thing" for other processes than your own

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