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What is proc PID EXE?
/proc//exe is a reference to an open file description inside the kernel. There’s no way to convey an open file description exactly: it’s a data structure inside the kernel. So the kernel represents it in an approximate way: as a symbolic link to the file.
What is Fdinfo?
PROCFS /proc//fdinfo/ This target provides files () whose names are the decimal representations of the open file descriptors within the specified process ID (). The file might be read by the owning process to get information about the process open session with a file or directory.
What is proc filesystem used for?
The proc filesystem (procfs) is a special filesystem in Unix-like operating systems that presents information about processes and other system information in a hierarchical file-like structure, providing a more convenient and standardized method for dynamically accessing process data held in the kernel than traditional …
How is proc implemented?
The proc filesystem is entirely virtual, and is implemented so the internal VFS readlink delegates to the right place for special symlinks. So, it calculates what self points to when it is read / traversed, not every context switch. Files in /proc are not stored on a disk, they are generated on the fly by the kernel.
Can a PID be used in a proc file?
This means that /proc/ [pid] entries can no longer be used to discover the PIDs on the system.
What is the argument n in proc [ PID ]?
The argument, n, is one of the following values: 0 Everybody may access all /proc/ [pid] directories.
What does Proc mean in pseudo file system?
/proc/[pid]/fd. This is a subdirectory containing one entry for each file which the process has open, named by its file descriptor, and which is a symbolic link to the actual file. Thus, 0 is standard input, 1 standard output, 2 standard error, etc.
Which is the same as proc / self / FD / N?
/proc/self/fd/N is approximately the same as /dev/fd/N in some UNIX and UNIX-like systems. Most Linux MAKEDEV scripts symbolically link /dev/fd to /proc/self/fd, in fact. Most systems provide symbolic links /dev/stdin, /dev/stdout, and /dev/stderr, which respectively link to the files 0, 1, and 2 in /proc/self/fd.