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OPENPROC(3)		   Linux Programmer's Manual		   OPENPROC(3)

NAME
       openproc, closeproc  - initialize process information from /proc/

SYNOPSIS
       #include <proc/readproc.h>

       PROCTAB* openproc (int flags, ... );
       void closeproc (PROCTAB* PT);

SYNOPSIS
       The openproc function initializes a PROCTAB structure which can be used
       by iterated readproc calls to get  information  on  current  processes.
       Depending on flags, openproc may need a second argument or a second and
       third argument (see below).

       closeproc closes all files opened by openproc and deallocates the  mem‐
       ory allocated by openproc.

       The PROCTAB structure is defined in <proc/readproc.h>

RETURN VALUE
       openproc	 returns a pointer to a PROCTAB structure, or NULL if an error
       occurs. This usually means that /proc cannot be read by the process.

FLAGS
       The behaviour of openproc is controlled by the following set of	flags,
       which  may  be ORed together. There are three different kinds of flags.
       The first group of flags determins which	 information  gets  read  from
       /proc/#pid  for	each process. The second group of flags (of which only
       one can be enacted for a opendir call) restricts which processes infor‐
       mation  is read for by providing a list of criteria. The third group of
       flags restricts this as well, but doesn't need arguments. These may  be
       used together again.

       PROC_FILLMEM
	    read information from /proc/#pid/statm

       PROC_FILLCOM
	    allocate   cmdline	part  of  proc_t  and  read  information  from
	    /proc/#pid/cmdline

       PROC_FILLENV
	    allocate  environ  part  of	 proc_t	 and  read  information	  from
	    /proc/#pid/environ

       PROC_FILLUSR
	    resolve user ids to names via /etc/passwd

       PROC_FILLGRP
	    resolve group ids to names via /etc/group

       PROC_FILLSTATUS
	    read information from /proc/#pid/status

       PROC_FILLSTAT
	    read information from /proc/#pid/stat

       PROC_FILLARG
	    equivalent to PROC_FILLCOM

       PROC_FILLCGROUP
	    alloc and fill in cgroup

       PROC_FILLSUPGRP
	    resolve supplementary group id -> group name

       PROC_FILLOOM
	    fill in proc_t oom_score and oom_adj

       PROC_FILLNS
	    fill in proc_t namespace information

       PROC_FILLSYSTEMD
	    fill in proc_t systemd information

       PROC_LOOSE_TASKS
	    threat threads as if they were processes

       PROC_PID (2nd argument pid_t* pidlist)
	    lookup  only processes whose pid is contained in pidlist (the list
	    is terminated with 0)

       PROC_UID (arguments uid_t* uidlist, int n)
	    lookup only processes whose user id is contained in uidlist (where
	    n is the number of uids contained in the list)

       PROC_EDITCGRPCVT
	    edit cgroup as single vector

       PROC_EDITCMDLCVT
	    edit cmdline as single vector

       PROC_EDITENVRCVT
	    edit environ as single vector

NOTE
       Only one of the flags needing additional arguments (PROC_{PID,UID}) may
       be used at a time.

SEE ALSO
       readproc(3), readproctab(3), /proc/, /usr/include/proc/readproc.h,

REPORTING BUGS
       Please send bug reports to ⟨procps@freelists.org⟩

Linux Manpage			 14 July 2014			   OPENPROC(3)
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