glibc/sysdeps/unix/sysv/linux/bits/local_lim.h

/* Minimum guaranteed maximum values for system limits.  Linux version.
   Copyright (C) 1993-2019 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If
   not, see <https://www.gnu.org/licenses/>.  */

/* The kernel header pollutes the namespace with the NR_OPEN symbol
   and defines LINK_MAX although filesystems have different maxima.  A
   similar thing is true for OPEN_MAX: the limit can be changed at
   runtime and therefore the macro must not be defined.  Remove this
   after including the header if necessary.  */
#ifndef NR_OPEN
# define __undef_NR_OPEN
#endif
#ifndef LINK_MAX
# define __undef_LINK_MAX
#endif
#ifndef OPEN_MAX
# define __undef_OPEN_MAX
#endif
#ifndef ARG_MAX
# define __undef_ARG_MAX
#endif

/* The kernel sources contain a file with all the needed information.  */
#include <linux/limits.h>

/* Have to remove NR_OPEN?  */
#ifdef __undef_NR_OPEN
# undef NR_OPEN
# undef __undef_NR_OPEN
#endif
/* Have to remove LINK_MAX?  */
#ifdef __undef_LINK_MAX
# undef LINK_MAX
# undef __undef_LINK_MAX
#endif
/* Have to remove OPEN_MAX?  */
#ifdef __undef_OPEN_MAX
# undef OPEN_MAX
# undef __undef_OPEN_MAX
#endif
/* Have to remove ARG_MAX?  */
#ifdef __undef_ARG_MAX
# undef ARG_MAX
# undef __undef_ARG_MAX
#endif

/* The number of data keys per process.  */
#define _POSIX_THREAD_KEYS_MAX	128
/* This is the value this implementation supports.  */
#define PTHREAD_KEYS_MAX	1024

/* Controlling the iterations of destructors for thread-specific data.  */
#define _POSIX_THREAD_DESTRUCTOR_ITERATIONS	4
/* Number of iterations this implementation does.  */
#define PTHREAD_DESTRUCTOR_ITERATIONS	_POSIX_THREAD_DESTRUCTOR_ITERATIONS

/* The number of threads per process.  */
#define _POSIX_THREAD_THREADS_MAX	64
/* We have no predefined limit on the number of threads.  */
#undef PTHREAD_THREADS_MAX

/* Maximum amount by which a process can descrease its asynchronous I/O
   priority level.  */
#define AIO_PRIO_DELTA_MAX	20

/* Minimum size for a thread.  We are free to choose a reasonable value.  */
#define PTHREAD_STACK_MIN	16384

/* Maximum number of timer expiration overruns.  */
#define DELAYTIMER_MAX	2147483647

/* Maximum tty name length.  */
#define TTY_NAME_MAX		32

/* Maximum login name length.  This is arbitrary.  */
#define LOGIN_NAME_MAX		256

/* Maximum host name length.  */
#define HOST_NAME_MAX		64

/* Maximum message queue priority level.  */
#define MQ_PRIO_MAX		32768

/* Maximum value the semaphore can have.  */
#define SEM_VALUE_MAX   (2147483647)