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 .\" Written by Garrett Wollman
 .\" This file is in the public domain.
 .\"
-.Dd April 10, 2023
+.Dd June 23, 2024
 .Dt PROCFS 4
 .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.
+the process effective UID
+.It
+the process real UID
+.It
+group list, starting with the effective GID, 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 .