1 /* Bit values & structures for resource limits. Linux version.
2 Copyright (C) 1994-2016 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
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 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 #ifndef _SYS_RESOURCE_H
20 # error "Never use <bits/resource.h> directly; include <sys/resource.h> instead."
23 #include <bits/types.h>
25 /* Transmute defines to enumerations. The macro re-definitions are
26 necessary because some programs want to test for operating system
27 features with #ifdef RUSAGE_SELF. In ISO C the reflexive
28 definition is a no-op. */
30 /* Kinds of resource limit. */
31 enum __rlimit_resource
33 /* Per-process CPU limit, in seconds. */
35 #define RLIMIT_CPU RLIMIT_CPU
37 /* Largest file that can be created, in bytes. */
39 #define RLIMIT_FSIZE RLIMIT_FSIZE
41 /* Maximum size of data segment, in bytes. */
43 #define RLIMIT_DATA RLIMIT_DATA
45 /* Maximum size of stack segment, in bytes. */
47 #define RLIMIT_STACK RLIMIT_STACK
49 /* Largest core file that can be created, in bytes. */
51 #define RLIMIT_CORE RLIMIT_CORE
53 /* Largest resident set size, in bytes.
54 This affects swapping; processes that are exceeding their
55 resident set size will be more likely to have physical memory
58 #define RLIMIT_RSS __RLIMIT_RSS
60 /* Number of open files. */
62 __RLIMIT_OFILE
= RLIMIT_NOFILE
, /* BSD name for same. */
63 #define RLIMIT_NOFILE RLIMIT_NOFILE
64 #define RLIMIT_OFILE __RLIMIT_OFILE
66 /* Address space limit. */
68 #define RLIMIT_AS RLIMIT_AS
70 /* Number of processes. */
72 #define RLIMIT_NPROC __RLIMIT_NPROC
74 /* Locked-in-memory address space. */
76 #define RLIMIT_MEMLOCK __RLIMIT_MEMLOCK
78 /* Maximum number of file locks. */
80 #define RLIMIT_LOCKS __RLIMIT_LOCKS
82 /* Maximum number of pending signals. */
83 __RLIMIT_SIGPENDING
= 11,
84 #define RLIMIT_SIGPENDING __RLIMIT_SIGPENDING
86 /* Maximum bytes in POSIX message queues. */
87 __RLIMIT_MSGQUEUE
= 12,
88 #define RLIMIT_MSGQUEUE __RLIMIT_MSGQUEUE
90 /* Maximum nice priority allowed to raise to.
91 Nice levels 19 .. -20 correspond to 0 .. 39
92 values of this resource limit. */
94 #define RLIMIT_NICE __RLIMIT_NICE
96 /* Maximum realtime priority allowed for non-priviledged
99 #define RLIMIT_RTPRIO __RLIMIT_RTPRIO
101 /* Maximum CPU time in µs that a process scheduled under a real-time
102 scheduling policy may consume without making a blocking system
103 call before being forcibly descheduled. */
104 __RLIMIT_RTTIME
= 15,
105 #define RLIMIT_RTTIME __RLIMIT_RTTIME
107 __RLIMIT_NLIMITS
= 16,
108 __RLIM_NLIMITS
= __RLIMIT_NLIMITS
109 #define RLIMIT_NLIMITS __RLIMIT_NLIMITS
110 #define RLIM_NLIMITS __RLIM_NLIMITS
113 /* Value to indicate that there is no limit. */
114 #ifndef __USE_FILE_OFFSET64
115 # define RLIM_INFINITY ((__rlim_t) -1)
117 # define RLIM_INFINITY 0xffffffffffffffffuLL
120 #ifdef __USE_LARGEFILE64
121 # define RLIM64_INFINITY 0xffffffffffffffffuLL
124 /* We can represent all limits. */
125 #define RLIM_SAVED_MAX RLIM_INFINITY
126 #define RLIM_SAVED_CUR RLIM_INFINITY
129 /* Type for resource quantity measurement. */
130 #ifndef __USE_FILE_OFFSET64
131 typedef __rlim_t rlim_t
;
133 typedef __rlim64_t rlim_t
;
135 #ifdef __USE_LARGEFILE64
136 typedef __rlim64_t rlim64_t
;
141 /* The current (soft) limit. */
143 /* The hard limit. */
147 #ifdef __USE_LARGEFILE64
150 /* The current (soft) limit. */
152 /* The hard limit. */
157 /* Whose usage statistics do you want? */
160 /* The calling process. */
162 #define RUSAGE_SELF RUSAGE_SELF
164 /* All of its terminated child processes. */
166 #define RUSAGE_CHILDREN RUSAGE_CHILDREN
170 /* The calling thread. */
172 # define RUSAGE_THREAD RUSAGE_THREAD
173 /* Name for the same functionality on Solaris. */
174 # define RUSAGE_LWP RUSAGE_THREAD
178 #define __need_timeval
179 #include <bits/time.h> /* For `struct timeval'. */
181 /* Structure which says how much of each resource has been used. */
183 /* The purpose of all the unions is to have the kernel-compatible layout
184 while keeping the API type as 'long int', and among machines where
185 __syscall_slong_t is not 'long int', this only does the right thing
186 for little-endian ones, like x32. */
189 /* Total amount of user time used. */
190 struct timeval ru_utime
;
191 /* Total amount of system time used. */
192 struct timeval ru_stime
;
193 /* Maximum resident set size (in kilobytes). */
197 __syscall_slong_t __ru_maxrss_word
;
199 /* Amount of sharing of text segment memory
200 with other processes (kilobyte-seconds). */
201 /* Maximum resident set size (in kilobytes). */
205 __syscall_slong_t __ru_ixrss_word
;
207 /* Amount of data segment memory used (kilobyte-seconds). */
211 __syscall_slong_t __ru_idrss_word
;
213 /* Amount of stack memory used (kilobyte-seconds). */
217 __syscall_slong_t __ru_isrss_word
;
219 /* Number of soft page faults (i.e. those serviced by reclaiming
220 a page from the list of pages awaiting reallocation. */
224 __syscall_slong_t __ru_minflt_word
;
226 /* Number of hard page faults (i.e. those that required I/O). */
230 __syscall_slong_t __ru_majflt_word
;
232 /* Number of times a process was swapped out of physical memory. */
236 __syscall_slong_t __ru_nswap_word
;
238 /* Number of input operations via the file system. Note: This
239 and `ru_oublock' do not include operations with the cache. */
243 __syscall_slong_t __ru_inblock_word
;
245 /* Number of output operations via the file system. */
249 __syscall_slong_t __ru_oublock_word
;
251 /* Number of IPC messages sent. */
255 __syscall_slong_t __ru_msgsnd_word
;
257 /* Number of IPC messages received. */
261 __syscall_slong_t __ru_msgrcv_word
;
263 /* Number of signals delivered. */
266 long int ru_nsignals
;
267 __syscall_slong_t __ru_nsignals_word
;
269 /* Number of voluntary context switches, i.e. because the process
270 gave up the process before it had to (usually to wait for some
271 resource to be available). */
275 __syscall_slong_t __ru_nvcsw_word
;
277 /* Number of involuntary context switches, i.e. a higher priority process
278 became runnable or the current process used up its time slice. */
282 __syscall_slong_t __ru_nivcsw_word
;
286 /* Priority limits. */
287 #define PRIO_MIN -20 /* Minimum priority a process can have. */
288 #define PRIO_MAX 20 /* Maximum priority a process can have. */
290 /* The type of the WHICH argument to `getpriority' and `setpriority',
291 indicating what flavor of entity the WHO argument specifies. */
292 enum __priority_which
294 PRIO_PROCESS
= 0, /* WHO is a process ID. */
295 #define PRIO_PROCESS PRIO_PROCESS
296 PRIO_PGRP
= 1, /* WHO is a process group ID. */
297 #define PRIO_PGRP PRIO_PGRP
298 PRIO_USER
= 2 /* WHO is a user ID. */
299 #define PRIO_USER PRIO_USER
306 /* Modify and return resource limits of a process atomically. */
307 # ifndef __USE_FILE_OFFSET64
308 extern int prlimit (__pid_t __pid
, enum __rlimit_resource __resource
,
309 const struct rlimit
*__new_limit
,
310 struct rlimit
*__old_limit
) __THROW
;
312 # ifdef __REDIRECT_NTH
313 extern int __REDIRECT_NTH (prlimit
, (__pid_t __pid
,
314 enum __rlimit_resource __resource
,
315 const struct rlimit
*__new_limit
,
316 struct rlimit
*__old_limit
), prlimit64
);
318 # define prlimit prlimit64
321 # ifdef __USE_LARGEFILE64
322 extern int prlimit64 (__pid_t __pid
, enum __rlimit_resource __resource
,
323 const struct rlimit64
*__new_limit
,
324 struct rlimit64
*__old_limit
) __THROW
;