resource/sys/resource.h

   1 /* Copyright (C) 1992, 1994, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #ifndef _SYS_RESOURCE_H
  20
  21 #define _SYS_RESOURCE_H 1
  22 #include <features.h>
  23
  24 __BEGIN_DECLS
  25
  26 /* Get the system-dependent definitions of structures and bit values.  */
  27 #include <resourcebits.h>
  28
  29 /* Put the soft and hard limits for RESOURCE in *RLIMITS.
  30    Returns 0 if successful, -1 if not (and sets errno).  */
  31 extern int __getrlimit __P ((enum __rlimit_resource __resource,
  32                              struct rlimit *__rlimits));
  33 extern int getrlimit __P ((enum __rlimit_resource __resource,
  34                            struct rlimit *__rlimits));
  35
  36 /* Set the soft and hard limits for RESOURCE to *RLIMITS.
  37    Only the super-user can increase hard limits.
  38    Return 0 if successful, -1 if not (and sets errno).  */
  39 extern int setrlimit __P ((enum __rlimit_resource __resource,
  40                            struct rlimit *__rlimits));
  41
  42 /* Return resource usage information on process indicated by WHO
  43    and put it in *USAGE.  Returns 0 for success, -1 for failure.  */
  44 extern int __getrusage __P ((enum __rusage_who __who, struct rusage *__usage));
  45 extern int getrusage __P ((enum __rusage_who __who, struct rusage *__usage));
  46
  47 /* Function depends on CMD:
  48    1 = Return the limit on the size of a file, in units of 512 bytes.
  49    2 = Set the limit on the size of a file to NEWLIMIT.  Only the
  50        super-user can increase the limit.
  51    3 = Return the maximum possible address of the data segment.
  52    4 = Return the maximum number of files that the calling process can open.
  53    Returns -1 on errors.  */
  54 extern long int __ulimit __P ((int __cmd, long int __newlimit));
  55 extern long int ulimit __P ((int __cmd, long int __newlimit));
  56
  57 /* Return the highest priority of any process specified by WHICH and WHO
  58    (see above); if WHO is zero, the current process, process group, or user
  59    (as specified by WHO) is used.  A lower priority number means higher
  60    priority.  Priorities range from PRIO_MIN to PRIO_MAX (above).  */
  61 extern int getpriority __P ((enum __priority_which __which, int __who));
  62
  63 /* Set the priority of all processes specified by WHICH and WHO (see above)
  64    to PRIO.  Returns 0 on success, -1 on errors.  */
  65 extern int setpriority __P ((enum __priority_which __which, int __who,
  66                              int __prio));
  67
  68
  69 __END_DECLS
  70
  71 #endif  /* resource.h  */