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
              respectively,  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
              limits 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
       emulates 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@smarden.org>

                                                                                         chpst(8)