May 22, 2023 · Explore the inner workings and practical applications of file descriptors, the key to efficient input/output operations in Linux.

The file descriptor structure contains a pointer to an open file description. There can be multiple file descriptors pointing to the same open file description, from multiple processes, for example when a …

A file descriptor designates an open file in a particular process. The kernel maintains a table of file descriptors for each process. Each entry in the file descriptor table indicates what to do if the process …

0 There are also syscalls other than close that may result in a file descriptor being closed and reused: dup2 and, on Linux, dup3. You may want to check your trace logs for these as well.

A Unix file descriptor is a small int value, returned by functions like open and creat, and passed to read, write, close, and so forth. At least in early versions of Unix, a file descriptor was simply an index into …

Dec 28, 2016 · I have created some file descriptors, using exec, and I would like to list what is the current status of my bash session. Is there a way to list the currently open file descriptors?

Each open file gets assigned a file descriptor and the file descriptor for stdin is 0 stdout is 1 stderr is 2 For opening additional files, there remain descriptors 3 to 9.

File handles (struct file in the kernel) are different from file descriptors: multiple file descriptors can point to the same file handle, and file handles can also exist without an associated descriptor internally. No …

Jan 1, 2019 · A hacky way to force a process to close a given file descriptor is described here using gdb to call close(fd). This seems dangerous, however. What if the closed descriptor is recycled? The …

47 The file descriptor, i.e. the 4 in your example, is the index into the process-specific file descriptor table, not the open file table. The file descriptor entry itself contains an index to an entry in the …