how to emulate dup2() system call

Anand Singh · 01-05-2013, 02:06 PM

I want to emulate dup2 without using fcntl. can anybody help me?

Regards,
Anand

NevemTeve · 01-06-2013, 01:46 AM

Give some context: if you want dup2, why don't you use dup2?

jpollard · 01-06-2013, 03:59 PM

Quote:

Originally Posted by Anand Singh

I want to emulate dup2 without using fcntl. can anybody help me?

Regards,
Anand

At a fundamental level, you can't. It is a system call that duplicates a file descriptor which is a kernel data structure. The file descriptor returned to a user process is nothing but an index into the kernel table - so "emulation" doesn't exist.