dup (2) — Linux manual page - man7.org
Since the two file descriptors refer to the same open file description, they share file offset and file status flags; for example, if the file offset is modified by using lseek (2) on one of the file descriptors, the …
dup () and dup2 () Linux system call - GeeksforGeeks
May 8, 2025 · The dup2 () system call is similar to dup () but the basic difference between them is that instead of using the lowest-numbered unused file descriptor, it uses the descriptor number specified …
dup2 (2): duplicate file descriptor - Linux man page
dup () uses the lowest-numbered unused descriptor for the new descriptor. dup2 () makes newfd be the copy of oldfd, closing newfd first if necessary, but note the following: If oldfd is not a valid file …
Redirecting Standard Output in C With the dup2() Function - Baeldung
Jun 14, 2025 · 4. The dup2 () Function The dup2 () function duplicates a file descriptor: int dup2(int oldfd, int newfd) Copy When the function returns, newfd refers to the file or device indicated by oldfd …
dup (system call) - Wikipedia
In Unix-like operating systems, dup (short for "duplicate") and dup2 system calls create a copy of a given file descriptor. This new descriptor actually does not behave like a copy, but like an alias of the old one.
_dup, _dup2 | Microsoft Learn
Dec 2, 2022 · The _dup and _dup2 functions associate a second file descriptor with a currently open file. These functions can be used to associate a predefined file descriptor, such as that for stdout, with a …
dup2 / dup - Why would I need to duplicate a file descriptor?
Jul 24, 2012 · After successful return of dup or dup2, the old and new descriptors may be used interchangeably. They share locks, file position pointers and flags; for example, if the file position is …
Harnessing the Power of dup2 () for I/O Control in Linux
Nov 1, 2023 · Hey there! If you‘re looking to take control of input and output in your C programs, the dup2() system call is a game-changer. Keep reading as I walk you through how to use dup2() like a …
The dup2 Function in C - Delft Stack
Mar 12, 2025 · When working with system-level programming in C, the dup2 function is an essential tool for managing file descriptors. This function allows you to duplicate one file descriptor to another, …
dup (2): duplicate a file | Linux Man Page
The dup2 () system call performs the same task as dup (), but instead of using the lowest-numbered unused file descriptor, it uses the file descriptor number specified in newfd. If the file descriptor newfd …