sys_resource.h man page on CentOS

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<sys/resource.h>(P)	   POSIX Programmer's Manual	   <sys/resource.h>(P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

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  con‐
       stants  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 sym‐
       bols 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 .

IEEE/The Open Group		     2003		   <sys/resource.h>(P)
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