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-.\" Written by Garrett Wollman
-.\" This file is in the public domain.
-.\"
-.Dd April 10, 2023
-.Dt PROCFS 5
-.Os
-.Sh NAME
-.Nm procfs
-.Nd process file system
-.Sh SYNOPSIS
-.Bd -literal
-proc		/proc	procfs	rw 0 0
-.Ed
-.Sh DESCRIPTION
-.Bf -symbolic
-This functionality is deprecated.
-Users are advised to use
-.Xr libprocstat 3
-and
-.Xr kvm 3
-instead.
-.Ef
-.Pp
-The process file system, or
-.Nm ,
-implements a view of the system process table inside the file system.
-It is normally mounted on
-.Pa /proc .
-.Pp
-The
-.Nm
-provides a two-level view of process space, unlike the previous
-.Fx 1.1
-.Nm
-implementation.
-At the highest level, processes themselves are named, according to
-their process ids in decimal, with no leading zeros.
-There is also a
-special node called
-.Pa curproc
-which always refers to the process making the lookup request.
-.Pp
-Each node is a directory which contains the following entries:
-.Bl -tag -width status
-.It Pa dbregs
-The debug registers as defined by
-.Dv "struct dbregs"
-in
-.In machine/reg.h .
-.Pa dbregs
-is currently only implemented on the i386 architecture.
-.It Pa etype
-The type of the executable referenced by the
-.Pa file
-entry.
-.It Pa file
-A symbolic link to the file from which the process text was read.
-This can be used to gain access to the process' symbol table,
-or to start another copy of the process.
-If the file cannot be found, the link target is
-.Ql unknown .
-.It Pa fpregs
-The floating point registers as defined by
-.Dv "struct fpregs"
-in
-.In machine/reg.h .
-.Pa fpregs
-is only implemented on machines which have distinct general
-purpose and floating point register sets.
-.It Pa map
-A collection of lines describing the memory regions of the process,
-where each line contains the following fields:
-.Bl -tag -compact -width private-resident
-.It start-address
-The starting address for the region (inclusive).
-.It end-address
-The ending address for the region (exclusive).
-.It resident
-The number of resident pages.
-.It private-resident
-The number of resident pages that were private to the process.
-.It obj
-The virtual address of the
-.Vt struct vm_object
-kernel data structure describing the memory region.
-.It access
-A three character string comprising the characters
-.Sq r ,
-.Sq w
-and
-.Sq x ,
-denoting read, write, and execute permissions respectively.
-The lack of a permission is represented by
-.Sq - .
-.It ref_count
-The number of references to the region.
-.It shadow_count
-The number of VM objects that this region is a shadow for.
-.It flags
-The flags for the object, see the flags named
-.Sy OBJ_*
-in
-.In vm/vm_object.h .
-.It copy-on-write
-Whether the region is copy-on-write.
-One of:
-.Bl -tag -compact -width NCOW
-.It COW
-A copy-on-write region.
-.It NCOW
-A non-copy-on-write region.
-.El
-.It needs-copy
-Whether the region needs a copy.
-One of:
-.Bl -tag -compact -width NNC
-.It NC
-The region needs a copy.
-.It NNC
-The region does not need a copy.
-.El
-.It type
-The type of the region.
-One of:
-.Bl -tag -compact -width unknown
-.It dead
-A region associated with a dead VM object.
-.It device
-A region backed by device memory.
-.It none
-A region not backed by anything.
-.It phys
-A region backed by physical memory.
-.It swap
-A region backed by swap.
-.It unknown
-A region of unknown type.
-.It vnode
-A region backed by a file.
-.El
-.It fullpath
-The path to the file backing the memory region, or
-.Sq -
-if there is no such file.
-.It cred
-One of:
-.Bl -tag -compact -width NCH
-.It CH
-The region is being charged to the user specified in the
-.Sq charged-uid
-field.
-.It NCH
-The region is not being charged to any user.
-.El
-.It charged-uid
-The UID of the user being charged, or -1 if no user is being charged.
-.El
-.It Pa 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.
-.It Pa note
-Used for sending signals to the process.
-Not implemented.
-.It Pa notepg
-Used for sending signal to the process group.
-Not implemented.
-.It Pa osrel
-Allows read and write of the kernel osrel value assigned to the process.
-It affects the compatibility shims that are turned on and off
-depending on the value.
-Initial process value is read from the ABI note tag in the executed ELF image,
-and is zero if the tag not supported by binary format or was not found.
-.It Pa regs
-Allows read and write access to the process' register set.
-This file contains a binary data structure
-.Dv "struct regs"
-defined in
-.In machine/reg.h .
-.Pa regs
-can only be written when the process is stopped.
-.It Pa rlimit
-This is a read-only file containing the process current and maximum
-limits.
-Each line is of the format
-.Ar rlimit current max ,
-with -1
-indicating infinity.
-.It Pa status
-The process status.
-This file is read-only and returns a single line containing
-multiple space-separated fields as follows:
-.Pp
-.Bl -bullet -compact
-.It
-command name
-.It
-process id
-.It
-parent process id
-.It
-process group id
-.It
-session id
-.It
-device name
-of the controlling terminal, or
-a minus sign
-.Pq Dq -
-if there is no controlling terminal.
-.It
-a list of process flags:
-.Dv ctty
-if there is a controlling terminal,
-.Dv sldr
-if the process is a session leader,
-.Dv noflags
-if neither of the other two flags are set.
-.It
-the process start time in seconds and microseconds,
-comma separated.
-.It
-the user time in seconds and microseconds,
-comma separated.
-.It
-the system time in seconds and microseconds,
-comma separated.
-.It
-the wait channel message
-.It
-the process credentials consisting of
-the effective user id
-and the list of groups (whose first member
-is the effective group id)
-all comma separated.
-.It
-the hostname of the jail in which the process runs, or
-.Ql -
-to indicate that the process is not running within a jail.
-.El
-.El
-.Pp
-Each node is owned by the process's user, and belongs to that user's
-primary group.
-.Sh FILES
-.Bl -tag -width /proc/curproc/XXXXXXX -compact
-.It Pa /proc
-normal mount point for the
-.Nm .
-.It Pa /proc/pid
-directory containing process information for process
-.Pa pid .
-.It Pa /proc/curproc
-directory containing process information for the current process
-.It Pa /proc/self
-directory containing process information for the current process
-.It Pa /proc/curproc/cmdline
-the process executable name
-.It Pa /proc/curproc/etype
-executable type
-.It Pa /proc/curproc/exe
-executable image
-.It Pa /proc/curproc/file
-executable image
-.It Pa /proc/curproc/fpregs
-the process floating point register set
-.It Pa /proc/curproc/map
-virtual memory map of the process
-.It Pa /proc/curproc/mem
-the complete virtual address space of the process
-.It Pa /proc/curproc/note
-used for signaling the process
-.It Pa /proc/curproc/notepg
-used for signaling the process group
-.It Pa /proc/curproc/osrel
-the process osrel value
-.It Pa /proc/curproc/regs
-the process register set
-.It Pa /proc/curproc/rlimit
-the process current and maximum rlimit
-.It Pa /proc/curproc/status
-the process' current status
-.El
-.Sh EXAMPLES
-To mount a
-.Nm
-file system on
-.Pa /proc :
-.Pp
-.Dl "mount -t procfs proc /proc"
-.Sh SEE ALSO
-.Xr procstat 1 ,
-.Xr mount 2 ,
-.Xr sigaction 2 ,
-.Xr unmount 2 ,
-.Xr kvm 3 ,
-.Xr libprocstat 3 ,
-.Xr pseudofs 9
-.Sh AUTHORS
-.An -nosplit
-This manual page written by
-.An Garrett Wollman ,
-based on the description
-provided by
-.An Jan-Simon Pendry ,
-and revamped later by
-.An Mike Pritchard .