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NAME

       sys/resource.h - definitions for XSI resource operations

SYNOPSIS

       #include <sys/resource.h>

DESCRIPTION

       The   <sys/resource.h>  header  shall  define  the  following  symbolic
       constants as possible values of the which argument of getpriority() and
       setpriority():

       PRIO_PROCESS
              Identifies the who argument as a process ID.

       PRIO_PGRP
              Identifies the who argument as a process group ID.

       PRIO_USER
              Identifies the who argument as a user ID.

       The following type shall be defined through typedef:

       rlim_t Unsigned integer type used for limit values.

       The following symbolic constants shall be defined:

       RLIM_INFINITY
              A value of rlim_t indicating no limit.

       RLIM_SAVED_MAX
              A  value of type rlim_t indicating an unrepresentable saved hard
              limit.

       RLIM_SAVED_CUR
              A value of type rlim_t indicating an unrepresentable saved  soft
              limit.

       On  implementations  where  all resource limits are representable in an
       object of type rlim_t, RLIM_SAVED_MAX and RLIM_SAVED_CUR  need  not  be
       distinct from RLIM_INFINITY.

       The following symbolic constants shall be defined as possible values of
       the who parameter of getrusage():

       RUSAGE_SELF
              Returns information about the current process.

       RUSAGE_CHILDREN
              Returns information about children of the current process.

       The <sys/resource.h> header shall  define  the  rlimit  structure  that
       includes at least the following members:

              rlim_t rlim_cur  The current (soft) limit.
              rlim_t rlim_max  The hard limit.

       The  <sys/resource.h>  header  shall  define  the rusage structure that
       includes at least the following members:

              struct timeval ru_utime  User time used.
              struct timeval ru_stime  System time used.

       The timeval structure shall be defined as described in <sys/time.h> .

       The following symbolic constants shall be defined  as  possible  values
       for the resource argument of getrlimit() and setrlimit():

       RLIMIT_CORE
              Limit on size of core file.

       RLIMIT_CPU
              Limit on CPU time per process.

       RLIMIT_DATA
              Limit on data segment size.

       RLIMIT_FSIZE
              Limit on file size.

       RLIMIT_NOFILE
              Limit on number of open files.

       RLIMIT_STACK
              Limit on stack size.

       RLIMIT_AS
              Limit on address space size.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.

              int  getpriority(int, id_t);
              int  getrlimit(int, struct rlimit *);
              int  getrusage(int, struct rusage *);
              int  setpriority(int, id_t, int);
              int  setrlimit(int, const struct rlimit *);

       The id_t  type  shall  be  defined  through  typedef  as  described  in
       <sys/types.h> .

       Inclusion  of  the  <sys/resource.h>  header  may also make visible all
       symbols from <sys/time.h>.

       The following sections are informative.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       <sys/time.h>  ,  <sys/types.h>  ,  the  System  Interfaces  volume   of
       IEEE Std 1003.1-2001, getpriority(), getrusage(), getrlimit()

COPYRIGHT

       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained  online
       at http://www.opengroup.org/unix/online.html .