在子进程 UNIX 上调用 setpgid
我想要 setpgid 的替代函数调用来调用已完成 exec() 调用的进程。 如果在已调用 exec 的子进程上调用 setpgid，则会返回错误。 是否存在替代功能？
I want a alternative function call for setpgid to call on a process that has done exec() call.
setpgid returns error if it is called on a child which has already called exec.
Does any alternative function exists?
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成功执行后，进程组只能由进程本身更改。如果子进程正在合作，从另一个进程更改它的最直接方法是使用管道或其他进程间通信机制来要求子进程更改其自己的进程组。另一种替代方法是附加到子进程（例如，使用 ptrace、gdb 或特定于操作系统的机制）并从子进程的上下文中执行 setpgid() 系统调用。其他替代方案（例如新的内核模块或修改内核内存）需要 root 或特殊的系统功能，并且可能比其他方法更糟糕。
After a successful exec, the process group can only be changed by the process itself. The most straightforward way to change it from another process, if the child is cooperating, would be to use a pipe or other interprocess communication mechanism to ask the child to change its own process group. Another alternative would be to attach to the child process (e.g. with ptrace, gdb, or an OS-specific mechansim) and execute the setpgid() system call from within the context of the child process. Other alternatives such as a new kernel module or modifying kernel memory require root or special system capabilities and are likely to be much worse than the other approaches.