glibc/sysdeps/unix/sysv/linux/bits/resource.h

/* Bit values & structures for resource limits.  Linux version.
   Copyright (C) 1994-2022 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#ifndef _SYS_RESOURCE_H
# error "Never use <bits/resource.h> directly; include <sys/resource.h> instead."
#endif

#include <bits/types.h>

/* Transmute defines to enumerations.  The macro re-definitions are
   necessary because some programs want to test for operating system
   features with #ifdef RUSAGE_SELF.  In ISO C the reflexive
   definition is a no-op.  */

/* Kinds of resource limit.  */
enum __rlimit_resource
{
  /* Per-process CPU limit, in seconds.  */
  RLIMIT_CPU = 0,
#define RLIMIT_CPU RLIMIT_CPU

  /* Largest file that can be created, in bytes.  */
  RLIMIT_FSIZE = 1,
#define	RLIMIT_FSIZE RLIMIT_FSIZE

  /* Maximum size of data segment, in bytes.  */
  RLIMIT_DATA = 2,
#define	RLIMIT_DATA RLIMIT_DATA

  /* Maximum size of stack segment, in bytes.  */
  RLIMIT_STACK = 3,
#define	RLIMIT_STACK RLIMIT_STACK

  /* Largest core file that can be created, in bytes.  */
  RLIMIT_CORE = 4,
#define	RLIMIT_CORE RLIMIT_CORE

  /* Largest resident set size, in bytes.
     This affects swapping; processes that are exceeding their
     resident set size will be more likely to have physical memory
     taken from them.  */
  __RLIMIT_RSS = 5,
#define	RLIMIT_RSS __RLIMIT_RSS

  /* Number of open files.  */
  RLIMIT_NOFILE = 7,
  __RLIMIT_OFILE = RLIMIT_NOFILE, /* BSD name for same.  */
#define RLIMIT_NOFILE RLIMIT_NOFILE
#define RLIMIT_OFILE __RLIMIT_OFILE

  /* Address space limit.  */
  RLIMIT_AS = 9,
#define RLIMIT_AS RLIMIT_AS

  /* Number of processes.  */
  __RLIMIT_NPROC = 6,
#define RLIMIT_NPROC __RLIMIT_NPROC

  /* Locked-in-memory address space.  */
  __RLIMIT_MEMLOCK = 8,
#define RLIMIT_MEMLOCK __RLIMIT_MEMLOCK

  /* Maximum number of file locks.  */
  __RLIMIT_LOCKS = 10,
#define RLIMIT_LOCKS __RLIMIT_LOCKS

  /* Maximum number of pending signals.  */
  __RLIMIT_SIGPENDING = 11,
#define RLIMIT_SIGPENDING __RLIMIT_SIGPENDING

  /* Maximum bytes in POSIX message queues.  */
  __RLIMIT_MSGQUEUE = 12,
#define RLIMIT_MSGQUEUE __RLIMIT_MSGQUEUE

  /* Maximum nice priority allowed to raise to.
     Nice levels 19 .. -20 correspond to 0 .. 39
     values of this resource limit.  */
  __RLIMIT_NICE = 13,
#define RLIMIT_NICE __RLIMIT_NICE

  /* Maximum realtime priority allowed for non-priviledged
     processes.  */
  __RLIMIT_RTPRIO = 14,
#define RLIMIT_RTPRIO __RLIMIT_RTPRIO

  /* Maximum CPU time in microseconds that a process scheduled under a real-time
     scheduling policy may consume without making a blocking system
     call before being forcibly descheduled.  */
  __RLIMIT_RTTIME = 15,
#define RLIMIT_RTTIME __RLIMIT_RTTIME

  __RLIMIT_NLIMITS = 16,
  __RLIM_NLIMITS = __RLIMIT_NLIMITS
#define RLIMIT_NLIMITS __RLIMIT_NLIMITS
#define RLIM_NLIMITS __RLIM_NLIMITS
};

/* Value to indicate that there is no limit.  */
#ifndef __USE_FILE_OFFSET64
# define RLIM_INFINITY ((__rlim_t) -1)
#else
# define RLIM_INFINITY 0xffffffffffffffffuLL
#endif

#ifdef __USE_LARGEFILE64
# define RLIM64_INFINITY 0xffffffffffffffffuLL
#endif

/* We can represent all limits.  */
#define RLIM_SAVED_MAX	RLIM_INFINITY
#define RLIM_SAVED_CUR	RLIM_INFINITY


/* Type for resource quantity measurement.  */
#ifndef __USE_FILE_OFFSET64
typedef __rlim_t rlim_t;
#else
typedef __rlim64_t rlim_t;
#endif
#ifdef __USE_LARGEFILE64
typedef __rlim64_t rlim64_t;
#endif

struct rlimit
  {
    /* The current (soft) limit.  */
    rlim_t rlim_cur;
    /* The hard limit.  */
    rlim_t rlim_max;
  };

#ifdef __USE_LARGEFILE64
struct rlimit64
  {
    /* The current (soft) limit.  */
    rlim64_t rlim_cur;
    /* The hard limit.  */
    rlim64_t rlim_max;
 };
#endif

/* Whose usage statistics do you want?  */
enum __rusage_who
{
  /* The calling process.  */
  RUSAGE_SELF = 0,
#define RUSAGE_SELF RUSAGE_SELF

  /* All of its terminated child processes.  */
  RUSAGE_CHILDREN = -1
#define RUSAGE_CHILDREN RUSAGE_CHILDREN

#ifdef __USE_GNU
  ,
  /* The calling thread.  */
  RUSAGE_THREAD = 1
# define RUSAGE_THREAD RUSAGE_THREAD
  /* Name for the same functionality on Solaris.  */
# define RUSAGE_LWP RUSAGE_THREAD
#endif
};

#include <bits/types/struct_timeval.h>
#include <bits/types/struct_rusage.h>

/* Priority limits.  */
#define PRIO_MIN	-20	/* Minimum priority a process can have.  */
#define PRIO_MAX	20	/* Maximum priority a process can have.  */

/* The type of the WHICH argument to `getpriority' and `setpriority',
   indicating what flavor of entity the WHO argument specifies.  */
enum __priority_which
{
  PRIO_PROCESS = 0,		/* WHO is a process ID.  */
#define PRIO_PROCESS PRIO_PROCESS
  PRIO_PGRP = 1,		/* WHO is a process group ID.  */
#define PRIO_PGRP PRIO_PGRP
  PRIO_USER = 2			/* WHO is a user ID.  */
#define PRIO_USER PRIO_USER
};


__BEGIN_DECLS

#ifdef __USE_GNU
/* Modify and return resource limits of a process atomically.  */
# ifndef __USE_FILE_OFFSET64
extern int prlimit (__pid_t __pid, enum __rlimit_resource __resource,
		    const struct rlimit *__new_limit,
		    struct rlimit *__old_limit) __THROW;
# else
#  ifdef __REDIRECT_NTH
extern int __REDIRECT_NTH (prlimit, (__pid_t __pid,
				     enum __rlimit_resource __resource,
				     const struct rlimit *__new_limit,
				     struct rlimit *__old_limit), prlimit64);
#  else
#   define prlimit prlimit64
#  endif
# endif
# ifdef __USE_LARGEFILE64
extern int prlimit64 (__pid_t __pid, enum __rlimit_resource __resource,
		      const struct rlimit64 *__new_limit,
		      struct rlimit64 *__old_limit) __THROW;
# endif
#endif

__END_DECLS