bits/resource.h

   1 /* Bit values & structures for resource limits.  4.4 BSD/generic GNU version.
   2    Copyright (C) 1994, 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _SYS_RESOURCE_H
  21 # error "Never use <bits/resource.h> directly; include <sys/resource.h> instead."
  22 #endif
  23
  24 #include <bits/types.h>
  25
  26 /* These are the values for 4.4 BSD and GNU.  Earlier BSD systems have a
  27    subset of these kinds of resource limit.  In systems where `getrlimit'
  28    and `setrlimit' are not system calls, these are the values used by the C
  29    library to emulate them.  */
  30
  31 /* Kinds of resource limit.  */
  32 enum __rlimit_resource
  33   {
  34     /* Per-process CPU limit, in seconds.  */
  35     RLIMIT_CPU,
  36 #define RLIMIT_CPU      RLIMIT_CPU
  37     /* Largest file that can be created, in bytes.  */
  38     RLIMIT_FSIZE,
  39 #define RLIMIT_FSIZE    RLIMIT_FSIZE
  40     /* Maximum size of data segment, in bytes.  */
  41     RLIMIT_DATA,
  42 #define RLIMIT_DATA     RLIMIT_DATA
  43     /* Maximum size of stack segment, in bytes.  */
  44     RLIMIT_STACK,
  45 #define RLIMIT_STACK    RLIMIT_STACK
  46     /* Largest core file that can be created, in bytes.  */
  47     RLIMIT_CORE,
  48 #define RLIMIT_CORE     RLIMIT_CORE
  49     /* Largest resident set size, in bytes.
  50        This affects swapping; processes that are exceeding their
  51        resident set size will be more likely to have physical memory
  52        taken from them.  */
  53     RLIMIT_RSS,
  54 #define RLIMIT_RSS      RLIMIT_RSS
  55     /* Locked-in-memory address space.  */
  56     RLIMIT_MEMLOCK,
  57 #define RLIMIT_MEMLOCK  RLIMIT_MEMLOCK
  58     /* Number of processes.  */
  59     RLIMIT_NPROC,
  60 #define RLIMIT_NPROC    RLIMIT_NPROC
  61     /* Number of open files.  */
  62     RLIMIT_OFILE,
  63     RLIMIT_NOFILE = RLIMIT_OFILE, /* Another name for the same thing.  */
  64 #define RLIMIT_OFILE    RLIMIT_OFILE
  65 #define RLIMIT_NOFILE   RLIMIT_NOFILE
  66
  67     RLIMIT_NLIMITS,             /* Number of limit flavors.  */
  68     RLIM_NLIMITS = RLIMIT_NLIMITS, /* Traditional name for same.  */
  69
  70     RLIM_INFINITY = 0x7fffffff /* Value to indicate that there is no limit.  */
  71 #define RLIM_INFINITY RLIM_INFINITY
  72   };
  73
  74 /* Type for resource quantity measurement.  */
  75 #ifndef __USE_FILE_OFFSET64
  76 typedef __rlim_t rlim_t;
  77 #else
  78 typedef __rlim64_t rlim_t;
  79 #endif
  80 #ifdef __USE_LARGEFILE64
  81 typedef __rlim64_t rlim64_t;
  82 #endif
  83
  84 struct rlimit
  85   {
  86     /* The current (soft) limit.  */
  87     rlim_t rlim_cur;
  88     /* The hard limit.  */
  89     rlim_t rlim_max;
  90   };
  91
  92 #ifdef __USE_LARGEFILE64
  93 struct rlimit64
  94   {
  95     /* The current (soft) limit.  */
  96     rlim64_t rlim_cur;
  97     /* The hard limit.  */
  98     rlim64_t rlim_max;
  99  };
 100 #endif
 101
 102 /* Whose usage statistics do you want?  */
 103 enum __rusage_who
 104 /* The macro definitions are necessary because some programs want
 105    to test for operating system features with #ifdef RUSAGE_SELF.
 106    In ISO C the reflexive definition is a no-op.  */
 107   {
 108     /* The calling process.  */
 109     RUSAGE_SELF = 0,
 110 #define RUSAGE_SELF     RUSAGE_SELF
 111     /* All of its terminated child processes.  */
 112     RUSAGE_CHILDREN = -1
 113 #define RUSAGE_CHILDREN RUSAGE_CHILDREN
 114   };
 115
 116 #define __need_timeval
 117 #include <bits/time.h>           /* For `struct timeval'.  */
 118
 119 /* Structure which says how much of each resource has been used.  */
 120 struct rusage
 121   {
 122     /* Total amount of user time used.  */
 123     struct timeval ru_utime;
 124     /* Total amount of system time used.  */
 125     struct timeval ru_stime;
 126     /* Maximum resident set size (in kilobytes).  */
 127     long int ru_maxrss;
 128     /* Amount of sharing of text segment memory
 129        with other processes (kilobyte-seconds).  */
 130     long int ru_ixrss;
 131     /* Amount of data segment memory used (kilobyte-seconds).  */
 132     long int ru_idrss;
 133     /* Amount of stack memory used (kilobyte-seconds).  */
 134     long int ru_isrss;
 135     /* Number of soft page faults (i.e. those serviced by reclaiming
 136        a page from the list of pages awaiting reallocation.  */
 137     long int ru_minflt;
 138     /* Number of hard page faults (i.e. those that required I/O).  */
 139     long int ru_majflt;
 140     /* Number of times a process was swapped out of physical memory.  */
 141     long int ru_nswap;
 142     /* Number of input operations via the file system.  Note: This
 143        and `ru_oublock' do not include operations with the cache.  */
 144     long int ru_inblock;
 145     /* Number of output operations via the file system.  */
 146     long int ru_oublock;
 147     /* Number of IPC messages sent.  */
 148     long int ru_msgsnd;
 149     /* Number of IPC messages received.  */
 150     long int ru_msgrcv;
 151     /* Number of signals delivered.  */
 152     long int ru_nsignals;
 153     /* Number of voluntary context switches, i.e. because the process
 154        gave up the process before it had to (usually to wait for some
 155        resource to be available).  */
 156     long int ru_nvcsw;
 157     /* Number of involuntary context switches, i.e. a higher priority process
 158        became runnable or the current process used up its time slice.  */
 159     long int ru_nivcsw;
 160   };
 161
 162 /* Priority limits.  */
 163 #define PRIO_MIN        -20     /* Minimum priority a process can have.  */
 164 #define PRIO_MAX        20      /* Maximum priority a process can have.  */
 165
 166 /* The type of the WHICH argument to `getpriority' and `setpriority',
 167    indicating what flavor of entity the WHO argument specifies.  */
 168 enum __priority_which
 169   {
 170     PRIO_PROCESS = 0,           /* WHO is a process ID.  */
 171     PRIO_PGRP = 1,              /* WHO is a process group ID.  */
 172     PRIO_USER = 2               /* WHO is a user ID.  */
 173   };