glibc (2.38)
1 /* Minimum guaranteed maximum values for system limits. Linux version.
2 Copyright (C) 1993-2023 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 Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If
17 not, see <https://www.gnu.org/licenses/>. */
18
19 /* The kernel header pollutes the namespace with the NR_OPEN symbol
20 and defines LINK_MAX although filesystems have different maxima. A
21 similar thing is true for OPEN_MAX: the limit can be changed at
22 runtime and therefore the macro must not be defined. Remove this
23 after including the header if necessary. */
24 #ifndef NR_OPEN
25 # define __undef_NR_OPEN
26 #endif
27 #ifndef LINK_MAX
28 # define __undef_LINK_MAX
29 #endif
30 #ifndef OPEN_MAX
31 # define __undef_OPEN_MAX
32 #endif
33 #ifndef ARG_MAX
34 # define __undef_ARG_MAX
35 #endif
36
37 /* The kernel sources contain a file with all the needed information. */
38 #include <linux/limits.h>
39
40 /* Have to remove NR_OPEN? */
41 #ifdef __undef_NR_OPEN
42 # undef NR_OPEN
43 # undef __undef_NR_OPEN
44 #endif
45 /* Have to remove LINK_MAX? */
46 #ifdef __undef_LINK_MAX
47 # undef LINK_MAX
48 # undef __undef_LINK_MAX
49 #endif
50 /* Have to remove OPEN_MAX? */
51 #ifdef __undef_OPEN_MAX
52 # undef OPEN_MAX
53 # undef __undef_OPEN_MAX
54 #endif
55 /* Have to remove ARG_MAX? */
56 #ifdef __undef_ARG_MAX
57 # undef ARG_MAX
58 # undef __undef_ARG_MAX
59 #endif
60
61 /* The number of data keys per process. */
62 #define _POSIX_THREAD_KEYS_MAX 128
63 /* This is the value this implementation supports. */
64 #define PTHREAD_KEYS_MAX 1024
65
66 /* Controlling the iterations of destructors for thread-specific data. */
67 #define _POSIX_THREAD_DESTRUCTOR_ITERATIONS 4
68 /* Number of iterations this implementation does. */
69 #define PTHREAD_DESTRUCTOR_ITERATIONS _POSIX_THREAD_DESTRUCTOR_ITERATIONS
70
71 /* The number of threads per process. */
72 #define _POSIX_THREAD_THREADS_MAX 64
73 /* We have no predefined limit on the number of threads. */
74 #undef PTHREAD_THREADS_MAX
75
76 /* Maximum amount by which a process can decrease its asynchronous I/O
77 priority level. */
78 #define AIO_PRIO_DELTA_MAX 20
79
80 /* Arrange for the definition of PTHREAD_STACK_MIN. */
81 #include <bits/pthread_stack_min-dynamic.h>
82
83 /* Maximum number of timer expiration overruns. */
84 #define DELAYTIMER_MAX 2147483647
85
86 /* Maximum tty name length. */
87 #define TTY_NAME_MAX 32
88
89 /* Maximum login name length. This is arbitrary. */
90 #define LOGIN_NAME_MAX 256
91
92 /* Maximum host name length. */
93 #define HOST_NAME_MAX 64
94
95 /* Maximum message queue priority level. */
96 #define MQ_PRIO_MAX 32768
97
98 /* Maximum value the semaphore can have. */
99 #define SEM_VALUE_MAX (2147483647)
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