mount_procfs



MOUNT_PROCFS(8)         OpenBSD System Manager's Manual        MOUNT_PROCFS(8)


NAME

     mount_procfs - mount the process file system


SYNOPSIS

     mount_procfs [-o options] /proc mount_point


DESCRIPTION

     The mount_procfs command attaches an instance of the process namespace to
     the global filesystem namespace.  The conventional mount point is /proc.
     This command is normally executed by mount(8) at boot time.

     The options are as follows:

     -o options
             Options are specified with a -o flag followed by a comma
             separated string of options.  See the mount(8) man page for
             possible options and their meanings.  The following procfs
             specific option is also available:

             linux   Add Linux compatibility links and nodes to procfs.

     The root of the process filesystem contains an entry for each active
     process.  These processes are visible as a directory whose name is the
     process's PID.  In addition, the special entry curproc references the
     current process.

     Each directory contains several files.

     cmdline
             Process command line parameters, separated by NULs.

     file    A reference to the vnode from which the process text was read.
             This can be used to gain access to the process's symbol table, or
             to start another copy of the process.

     mem     The complete virtual memory image of the process.  Only those
             address which exist in the process can be accessed.  Reads and
             writes to this file modify the process.  Writes to the text
             segment remain private to the process.

     status  The process status.  This file is read-only and returns a single
             line containing multiple space-separated fields as follows:

             o   Command name.
             o   Process ID.
             o   Parent process ID.
             o   Process group ID.
             o   Session ID.
             o   major,minor of the controlling terminal, or -1,-1 if there is
                 no controlling terminal.
             o   List of process flags: ctty if there is a controlling
                 terminal, sldr if the process is a session leader, or noflags
                 if neither of the other two flags are set.
             o   Process start time in seconds and microseconds, comma
                 separated.
             o   User time in seconds and microseconds, comma separated.
             o   System time in seconds and microseconds, comma separated.
             o   Wait channel message.
             o   Process credentials consisting of the effective user ID and
                 the list of groups (whose first member is the effective group
                 ID), all comma separated.

     Statistics reported by df(1) on a procfs filesystem will indicate virtual
     memory used/available instead of `disk space', and the number of process
     slots used/allocated instead of `inodes'.  The block size of the
     filesystem is the system page size.


FILES

     /proc/#
     /proc/curproc
     /proc/curproc/cmdline
     /proc/curproc/file
     /proc/curproc/mem
     /proc/curproc/status


SEE ALSO

     mount(2), fstab(5), mount(8), umount(8)


HISTORY

     The mount_procfs utility first appeared in 4.4BSD.


CAVEATS

     This filesystem may not be NFS-exported since most of the functionality
     of procfs requires that state be maintained.

OpenBSD 5.4                    December 28, 2011                   OpenBSD 5.4

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