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173
gnu/glibc/glibc-1.03/resource/sys/resource.h
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173
gnu/glibc/glibc-1.03/resource/sys/resource.h
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/* Copyright (C) 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#ifndef _SYS_RESOURCE_H
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#define _SYS_RESOURCE_H 1
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#include <features.h>
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#include <gnu/time.h>
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/* Kinds of resource limit. */
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enum __rlimit_resource
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{
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/* Per-process CPU limit, in seconds. */
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RLIMIT_CPU,
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/* Largest file that can be created, in bytes. */
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RLIMIT_FSIZE,
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/* Maximum size of data segment, in bytes. */
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RLIMIT_DATA,
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/* Maximum size of stack segment, in bytes. */
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RLIMIT_STACK,
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/* Largest core file that can be created, in bytes. */
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RLIMIT_CORE,
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/* Largest resident set size, in bytes.
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This affects swapping; processes that are exceeding their
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resident set size will be more likely to have physical memory
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taken from them. */
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RLIMIT_RSS,
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RLIM_NLIMITS
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};
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struct rlimit
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{
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/* The current (soft) limit. */
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int rlim_cur;
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/* The hard limit. */
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int rlim_max;
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};
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/* Value used to indicate that there is no limit. */
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#define RLIM_INFINITY 0x7fffffff
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/* Put the soft and hard limits for RESOURCE in *RLIMITS.
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Returns 0 if successful, -1 if not (and sets errno). */
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int EXFUN(getrlimit, (enum __rlimit_resource __resource,
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struct rlimit *__rlimits));
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/* Set the soft and hard limits for RESOURCE to *RLIMITS.
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Only the super-user can increase hard limits.
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Return 0 if successful, -1 if not (and sets errno). */
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int EXFUN(setrlimit, (enum __rlimit_resource __resource,
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struct rlimit *__rlimits));
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/* Whose usage statistics do you want? */
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enum __rusage_who
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{
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/* The calling process. */
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RUSAGE_SELF = 0,
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/* All of its terminated child processes. */
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RUSAGE_CHILDREN = -1,
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};
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/* Structure which says how much of each resource has been used. */
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struct rusage
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{
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/* Total amount of user time used. */
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struct __timeval ru_utime;
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/* Total amount of system time used. */
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struct __timeval ru_stime;
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/* Maximum resident set size (in kilobytes). */
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int ru_maxrss;
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/* Amount of sharing of text segment memory
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with other processes (kilobyte-seconds). */
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int ru_ixrss;
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/* Amount of data segment memory used (kilobyte-seconds). */
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int ru_idrss;
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/* Amount of stack memory used (kilobyte-seconds). */
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int ru_isrss;
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/* Number of soft page faults (i.e. those serviced by reclaiming
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a page from the list of pages awaiting reallocation. */
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int ru_minflt;
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/* Number of hard page faults (i.e. those that required I/O). */
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int ru_majflt;
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/* Number of times a process was swapped out of physical memory. */
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int ru_nswap;
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/* Number of input operations via the file system. Note: This
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and `ru_oublock' do not include operations with the cache. */
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int ru_inblock;
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/* Number of output operations via the file system. */
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int ru_oublock;
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/* Number of IPC messages sent. */
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int ru_msgsnd;
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/* Number of IPC messages received. */
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int ru_msgrcv;
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/* Number of signals delivered. */
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int ru_nsignals;
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/* Number of voluntary context switches, i.e. because the process
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gave up the process before it had to (usually to wait for some
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resource to be available). */
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int ru_nvcsw;
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/* Number of involuntary context switches, i.e. a higher priority process
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became runnable or the current process used up its time slice. */
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int ru_nivcsw;
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};
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/* Return resource usage information on process indicated by WHO
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and put it in *USAGE. Returns 0 for success, -1 for failure. */
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int EXFUN(__getrusage, (enum __rusage_who __who, struct rusage *__usage));
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int EXFUN(getrusage, (enum __rusage_who __who, struct rusage *__usage));
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#ifdef __OPTIMIZE__
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#define getrusage(who, usage) __getrusage((who), (usage))
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#endif /* Optimizing. */
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/* Function depends on CMD:
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1 = Return the limit on the size of a file, in units of 512 bytes.
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2 = Set the limit on the size of a file to NEWLIMIT. Only the
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super-user can increase the limit.
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3 = Return the maximum possible address of the data segment.
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4 = Return the maximum number of files that the calling process can open.
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Returns -1 on errors. */
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long int EXFUN(__ulimit, (int __cmd, long int __newlimit));
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long int EXFUN(ulimit, (int __cmd, long int __newlimit));
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#ifdef __OPTIMIZE__
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#define ulimit(cmd, newlimit) __ulimit((cmd), (newlimit))
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#endif /* Optimizing. */
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/* Priority limits. */
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#define PRIO_MIN -20 /* Minimum priority a process can have. */
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#define PRIO_MAX 20 /* Maximum priority a process can have. */
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/* The type of the WHICH argument to `getpriority' and `setpriority',
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indicating what flavor of entity the WHO argument specifies. */
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enum __priority_which
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{
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PRIO_PROCESS = 0, /* WHO is a process ID. */
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PRIO_PGRP = 1, /* WHO is a process group ID. */
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PRIO_USER = 2, /* WHO is a user ID. */
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};
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/* Return the highest priority of any process specified by WHICH and WHO
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(see above); if WHO is zero, the current process, process group, or user
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(as specified by WHO) is used. A lower priority number means higher
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priority. Priorities range from PRIO_MIN to PRIO_MAX (above). */
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extern int EXFUN(getpriority, (enum __priority_which __which, int __who));
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/* Set the priority of all processes specified by WHICH and WHO (see above)
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to PRIO. Returns 0 on success, -1 on errors. */
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extern int EXFUN(setpriority, (enum __priority_which __which, int __who,
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int __prio));
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#endif /* resource.h */
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