File Descriptor Duplication at Sharlene Burcham blog

File Descriptor Duplication. bash handles several filenames specially when they are used in redirections, as described in the following table: the dup() system call allocates a new file descriptor that refers to the same open file description as the descriptor oldfd. This is because the next syscall is also using file descriptor 3, so we need to duplicate it to another file descriptor to avoid closing it. you can duplicate a file descriptor, or allocate another file descriptor that refers to the same open file as the original. Dup2 () makes newfd be the copy of oldfd, closing.  — it is duplicating file descriptor 3 to file descriptor 255.  — how can one create a new file descriptor from an existing file descriptor such that the new descriptor does not.

Handling a File by its Descriptor in C codequoi
from www.codequoi.com

the dup() system call allocates a new file descriptor that refers to the same open file description as the descriptor oldfd. This is because the next syscall is also using file descriptor 3, so we need to duplicate it to another file descriptor to avoid closing it. Dup2 () makes newfd be the copy of oldfd, closing.  — how can one create a new file descriptor from an existing file descriptor such that the new descriptor does not.  — it is duplicating file descriptor 3 to file descriptor 255. you can duplicate a file descriptor, or allocate another file descriptor that refers to the same open file as the original. bash handles several filenames specially when they are used in redirections, as described in the following table:

Handling a File by its Descriptor in C codequoi

File Descriptor Duplication  — it is duplicating file descriptor 3 to file descriptor 255. you can duplicate a file descriptor, or allocate another file descriptor that refers to the same open file as the original.  — it is duplicating file descriptor 3 to file descriptor 255. the dup() system call allocates a new file descriptor that refers to the same open file description as the descriptor oldfd.  — how can one create a new file descriptor from an existing file descriptor such that the new descriptor does not. bash handles several filenames specially when they are used in redirections, as described in the following table: Dup2 () makes newfd be the copy of oldfd, closing. This is because the next syscall is also using file descriptor 3, so we need to duplicate it to another file descriptor to avoid closing it.

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