Mar 10, 2011 · When we open an existing file or create a new file, the kernel returns a file descriptor to the process. The kernel maintains a table of all open file descriptors, which are in …

This is ./fdtest: line 4: 3: Bad file descriptor ./fdtest: line 5: 4: Bad file descriptor But you can make descriptors 3 and 4 work, but number 1 fail by running:

Nov 5, 2015 · File descriptor is a positive integer index of a process's exlusive file descriptor table. The items of the file descriptor table are references to a system-wide open file description table.

Mar 11, 2010 · A file descriptor is a low-level integer "handle" used to identify an opened file (or socket, or whatever) at the kernel level, in Linux and other Unix-like systems. You pass …

Nov 29, 2016 · In Unix/ Linux operating systems, a file descriptor is an abstract indicator (handle) used to access a file or other IO (input/output) resource, such as a pipe or network socket. …

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 …

Aug 21, 2010 · The special aspect of file descriptor 3 is that it will usually be the first file descriptor returned from a system call that allocates a new file descriptor, given that 0, 1 and 2 are …

Mar 19, 2019 · Is it possible to get the filename of a file descriptor (Linux) in C?

File descriptors are numbers that "point" (or index) records in a process' own file descriptor table (one table for each process). Each record in the table has two values -- the pointer to an open …

Jul 2, 2010 · I have a FILE *, returned by a call to fopen(). I need to get a file descriptor from it, to make calls like fsync(fd) on it. What's the function to get a file descriptor from a file pointer?