File Descriptor Reuse at Vernon Bieber blog

File Descriptor Reuse. This means that the file descriptor is available for reuse by other processes. For a given process of pid 1234, on linux, you can query the set of file descriptors (in proc (5)) thru /proc/1234/fd/ and the memory mapping thru. Any record locks (see fcntl(2)) held. In linux, file descriptors are a fundamental concept used to represent and manage input and output streams between processes and files, sockets, pipes, and other. Open /dev/null with o_wronly, then dup2 to close the offending file descriptor and reuse it's descriptor for /dev/null. In unix, when a file descriptor is no longer in use or needed, it is considered free. On the file it was. The dup() system call allocates a new file descriptor that refers to the same open file description as the descriptor oldfd.

5 Reusing and Recycling
from issr.edu.kh

The dup() system call allocates a new file descriptor that refers to the same open file description as the descriptor oldfd. For a given process of pid 1234, on linux, you can query the set of file descriptors (in proc (5)) thru /proc/1234/fd/ and the memory mapping thru. Open /dev/null with o_wronly, then dup2 to close the offending file descriptor and reuse it's descriptor for /dev/null. This means that the file descriptor is available for reuse by other processes. On the file it was. Any record locks (see fcntl(2)) held. In linux, file descriptors are a fundamental concept used to represent and manage input and output streams between processes and files, sockets, pipes, and other. In unix, when a file descriptor is no longer in use or needed, it is considered free.

5 Reusing and Recycling

File Descriptor Reuse Open /dev/null with o_wronly, then dup2 to close the offending file descriptor and reuse it's descriptor for /dev/null. Any record locks (see fcntl(2)) held. The dup() system call allocates a new file descriptor that refers to the same open file description as the descriptor oldfd. For a given process of pid 1234, on linux, you can query the set of file descriptors (in proc (5)) thru /proc/1234/fd/ and the memory mapping thru. This means that the file descriptor is available for reuse by other processes. Open /dev/null with o_wronly, then dup2 to close the offending file descriptor and reuse it's descriptor for /dev/null. In unix, when a file descriptor is no longer in use or needed, it is considered free. On the file it was. In linux, file descriptors are a fundamental concept used to represent and manage input and output streams between processes and files, sockets, pipes, and other.

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