Can I globally redirect the output of system() calls?

Question

I have a program that executes various shell commands via system() and occasionally prints to cout . I want to redirect all output coming from system() calls to a log file so they don't clutter up the normal output. Can I do this without having to append > log to all my system commands?

Answer 1

看起来可以使用popen

Answer 2

关闭stdio文件描述符（0、1和2），然后在所需的任何输出设备上重新打开它们。

Answer 3

Using system is just a bad idea, period. If you use fork and execve or posix_spawn , you can easily make the necessary redirections and avoid all sorts of vulnerabilities from shell quoting issues.

Answer 4

If you can use a library that wrap process call. It is hard to code from posix. I use boost.process , it works fine. you can simply tell the lib how you want the output to be redirected...

my2c