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

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

SYNOPSIS
       #include 

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

SYNOPSIS
       The  openproc function initializes a PROCTAB structure which can be used by iterated read‐
       proc 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 memory allocated by
       openproc.

       The PROCTAB structure is defined in 

RETURN VALUE
       openproc returns a pointer to a PROCTAB structure, or NULL if an error occurs.  This  usu‐
       ally 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  informa‐
       tion  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_FILLWCHAN
            do WCHAN lookup

       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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