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 /* These are the values for 4.4 BSD and GNU.  Earlier BSD systems have a
  21    subset of these kinds of resource limit.  In systems where `getrlimit'
  22    and `setrlimit' are not system calls, these are the values used by the C
  23    library to emulate them.  */
  24
  25 /* Kinds of resource limit.  */
  26 enum __rlimit_resource
  27   {
  28     /* Per-process CPU limit, in seconds.  */
  29     RLIMIT_CPU,
  30 #define RLIMIT_CPU      RLIMIT_CPU
  31     /* Largest file that can be created, in bytes.  */
  32     RLIMIT_FSIZE,
  33 #define RLIMIT_FSIZE    RLIMIT_FSIZE
  34     /* Maximum size of data segment, in bytes.  */
  35     RLIMIT_DATA,
  36 #define RLIMIT_DATA     RLIMIT_DATA
  37     /* Maximum size of stack segment, in bytes.  */
  38     RLIMIT_STACK,
  39 #define RLIMIT_STACK    RLIMIT_STACK
  40     /* Largest core file that can be created, in bytes.  */
  41     RLIMIT_CORE,
  42 #define RLIMIT_CORE     RLIMIT_CORE
  43     /* Largest resident set size, in bytes.
  44        This affects swapping; processes that are exceeding their
  45        resident set size will be more likely to have physical memory
  46        taken from them.  */
  47     RLIMIT_RSS,
  48 #define RLIMIT_RSS      RLIMIT_RSS
  49     /* Locked-in-memory address space.  */
  50     RLIMIT_MEMLOCK,
  51 #define RLIMIT_MEMLOCK  RLIMIT_MEMLOCK
  52     /* Number of processes.  */
  53     RLIMIT_NPROC,
  54 #define RLIMIT_NPROC    RLIMIT_NPROC
  55     /* Number of open files.  */
  56     RLIMIT_OFILE,
  57     RLIMIT_NOFILE = RLIMIT_OFILE, /* Another name for the same thing.  */
  58 #define RLIMIT_OFILE    RLIMIT_OFILE
  59 #define RLIMIT_NOFILE   RLIMIT_NOFILE
  60
  61     RLIMIT_NLIMITS,             /* Number of limit flavors.  */
  62     RLIM_NLIMITS = RLIMIT_NLIMITS, /* Traditional name for same.  */
  63
  64     RLIM_INFINITY = 0x7fffffff /* Value to indicate that there is no limit.  */
  65 #define RLIM_INFINITY RLIM_INFINITY
  66   };
  67
  68 /* Type for resource quantity measurement.  */
  69 #ifndef __USE_FILE_OFFSET64
  70 typedef __rlim_t rlim_t;
  71 #else
  72 typedef __rlim64_t rlim_t;
  73 #endif
  74 #ifdef __USE_LARGEFILE64
  75 typedef __rlim64_t rlim64_t;
  76 #endif
  77
  78 struct rlimit
  79   {
  80     /* The current (soft) limit.  */
  81     rlim_t rlim_cur;
  82     /* The hard limit.  */
  83     rlim_t rlim_max;
  84   };
  85
  86 #ifdef __USE_LARGEFILE64
  87 struct rlimit64
  88   {
  89     /* The current (soft) limit.  */
  90     rlim64_t rlim_cur;
  91     /* The hard limit.  */
  92     rlim64_t rlim_max;
  93  };
  94 #endif
  95
  96 /* Whose usage statistics do you want?  */
  97 enum __rusage_who
  98 /* The macro definitions are necessary because some programs want
  99    to test for operating system features with #ifdef RUSAGE_SELF.
 100    In ISO C the reflexive definition is a no-op.  */
 101   {
 102     /* The calling process.  */
 103     RUSAGE_SELF = 0,
 104 #define RUSAGE_SELF     RUSAGE_SELF
 105     /* All of its terminated child processes.  */
 106     RUSAGE_CHILDREN = -1
 107 #define RUSAGE_CHILDREN RUSAGE_CHILDREN
 108   };
 109
 110 #include <sys/time.h>           /* For `struct timeval'.  */
 111
 112 /* Structure which says how much of each resource has been used.  */
 113 struct rusage
 114   {
 115     /* Total amount of user time used.  */
 116     struct timeval ru_utime;
 117     /* Total amount of system time used.  */
 118     struct timeval ru_stime;
 119     /* Maximum resident set size (in kilobytes).  */
 120     long int ru_maxrss;
 121     /* Amount of sharing of text segment memory
 122        with other processes (kilobyte-seconds).  */
 123     long int ru_ixrss;
 124     /* Amount of data segment memory used (kilobyte-seconds).  */
 125     long int ru_idrss;
 126     /* Amount of stack memory used (kilobyte-seconds).  */
 127     long int ru_isrss;
 128     /* Number of soft page faults (i.e. those serviced by reclaiming
 129        a page from the list of pages awaiting reallocation.  */
 130     long int ru_minflt;
 131     /* Number of hard page faults (i.e. those that required I/O).  */
 132     long int ru_majflt;
 133     /* Number of times a process was swapped out of physical memory.  */
 134     long int ru_nswap;
 135     /* Number of input operations via the file system.  Note: This
 136        and `ru_oublock' do not include operations with the cache.  */
 137     long int ru_inblock;
 138     /* Number of output operations via the file system.  */
 139     long int ru_oublock;
 140     /* Number of IPC messages sent.  */
 141     long int ru_msgsnd;
 142     /* Number of IPC messages received.  */
 143     long int ru_msgrcv;
 144     /* Number of signals delivered.  */
 145     long int ru_nsignals;
 146     /* Number of voluntary context switches, i.e. because the process
 147        gave up the process before it had to (usually to wait for some
 148        resource to be available).  */
 149     long int ru_nvcsw;
 150     /* Number of involuntary context switches, i.e. a higher priority process
 151        became runnable or the current process used up its time slice.  */
 152     long int ru_nivcsw;
 153   };
 154
 155 /* Priority limits.  */
 156 #define PRIO_MIN        -20     /* Minimum priority a process can have.  */
 157 #define PRIO_MAX        20      /* Maximum priority a process can have.  */
 158
 159 /* The type of the WHICH argument to `getpriority' and `setpriority',
 160    indicating what flavor of entity the WHO argument specifies.  */
 161 enum __priority_which
 162   {
 163     PRIO_PROCESS = 0,           /* WHO is a process ID.  */
 164     PRIO_PGRP = 1,              /* WHO is a process group ID.  */
 165     PRIO_USER = 2               /* WHO is a user ID.  */
 166   };