phpman > man > chpst(8)

chpst(8)                               System Manager's Manual                              chpst(8)



NAME
       chpst - runs a program with a changed process state

SYNOPSIS
       chpst  [-vVP012]  [-u user] [-U user] [-b argv0] [-e dir] [-/ root] [-n inc] [-l|-L lock] [-m
       bytes] [-d bytes] [-o n] [-p n] [-f bytes] [-c bytes] [-t seconds] prog

DESCRIPTION
       prog consists of one or more arguments.

       chpst changes the process state according to the given options, and runs prog.

OPTIONS
       -u [:]user[:group]
              setuidgid.  Set uid and gid to the user's uid and gid, as found  in  /etc/passwd.   If
              user  is  followed  by  a  colon  and a group, set the gid to group's gid, as found in
              /etc/group, instead of user's gid.  If group consists of  a  colon-separated  list  of
              group  names, chpst sets the group ids of all listed groups.  If user is prefixed with
              a colon, the user and all group arguments are interpreted  as  uid  and  gids  respec‐
              tively,  and  not  looked up in the password or group file.  All initial supplementary
              groups are removed.

       -U [:]user[:group]
              envuidgid.  Set the environment variables $UID and $GID to the user's uid and gid,  as
              found  in  /etc/passwd.   If  user is followed by a colon and a group, set $GID to the
              group's gid, as found in /etc/group, instead of user's gid.  If user is prefixed  with
              a colon, the user and group arguments are interpreted as uid and gid respectively, and
              not looked up in the password or group file.

       -b argv0
              argv0.  Run prog with argv0 as the 0th argument.

       -e dir envdir.  Set various environment variables as specified by files in the directory dir:
              If  dir  contains  a file named k whose first line is v, chpst removes the environment
              variable k if it exists, and then adds the environment variable k with  the  value  v.
              The name k must not contain =.  Spaces and tabs at the end of v are removed, and nulls
              in v are changed to newlines.  If the file k is empty (0 bytes  long),  chpst  removes
              the environment variable k if it exists, without adding a new variable.

       -/ root
              chroot.  Change the root directory to root before starting prog.

       -n inc nice.  Add inc to the nice(2) value before starting prog.  inc must be an integer, and
              may start with a minus or plus.

       -l lock
              lock.  Open the file lock for writing, and obtain an exclusive lock on it.  lock  will
              be  created  if it does not exist.  If lock is locked by another process, wait until a
              new lock can be obtained.

       -L lock
              The same as -l, but fail immediately if lock is locked by another process.

       -m bytes
              limit memory.  Limit the data segment, stack segment, locked physical pages, and total
              of all segment per process to bytes bytes each.

       -d bytes
              limit data segment.  Limit the data segment per process to bytes bytes.

       -o n   limit open files.  Limit the number of open file descriptors per process to n.

       -p n   limit processes.  Limit the number of processes per uid to n.

       -f bytes
              limit output size.  Limit the output file size to bytes bytes.

       -c bytes
              limit core size.  Limit the core file size to bytes bytes.

       -t seconds
              limit CPU time.  Limit CPU time to seconds seconds, delivering a SIGXCPU thereafter.

       -v     verbose.  Print verbose messages to standard error.  This includes warnings about lim‐
              its unsupported by the system.

       -V     version string.  Print a version string to standard error.

       -P     pgrphack.  Run prog in a new process group.

       -0     Close standard input before starting prog.

       -1     Close standard output before starting prog.

       -2     Close standard error before starting prog.

EXIT CODES
       chpst exits 100 when called with wrong options.  It prints an error message and exits 111  if
       it  has  trouble  changing the process state.  Otherwise its exit code is the same as that of
       prog.

EMULATION
       If chpst is called as envdir, envuidgid, pgrphack, setlock, setuidgid, or softlimit, it  emu‐
       lates the functionality of these programs from the daemontools package respectively.

SEE ALSO
       sv(8), runsv(8), setsid(2), runit(8), runit-init(8), runsvdir(8), runsvchdir(8)

        http://smarden.org/runit/
        http://cr.yp.to/daemontools.html

AUTHOR
       Gerrit Pape <pape AT smarden.org>



                                                                                            chpst(8)