如何设置父进程的工作目录？ [英] How do I set the working directory of the parent process?

问题描述

正如标题所揭示的，我们正在编写一个Unix风格的shell应用程序 U ，它应该在bash中调用（大多数情况下）。

U 究竟如何改变bash的工作目录（或一般的父目录）？

PS shell实用程序 chdir 成功地执行完全相同的操作，因此必须采用编程方式来实现该效果。 不要这样做。

  FILE * p; 
 char cmd [32]; 
 p = fopen（/ tmp / gdb_cmds，w）; 
 fprintf（p，call chdir（\.. \）\\\
detach\\\
quit\\\
）; 
 fclose（p）; 
 sprintf（cmd，gdb -p％d -batch -x / tmp / gdb_cmds，getppid（））; 
系统（cmd）; 
  

它可能会 工作，但请注意Bash的 pwd 命令被缓存，不会注意。

As the title reveals it, we are writing a Unix-style shell utility U that is supposed to be invoked (in most cases) from bash.

How exactly could U change the working directory of bash (or parent in general)?

P.S. The shell utility chdir succeeds in doing exactly the same, thus there must be a programmatic way of achieving the effect.

解决方案

Don't do this.

FILE *p;
char cmd[32];
p = fopen("/tmp/gdb_cmds", "w");
fprintf(p, "call chdir(\"..\")\ndetach\nquit\n");
fclose(p);
sprintf(cmd, "gdb -p %d -batch -x /tmp/gdb_cmds", getppid());
system(cmd);

It will probably work, though note that Bash's pwd command is cached and won't notice.

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