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The C and C++ Include Header Files

cat -n /usr/include/x86_64-linux-gnu/bits/sched.h

     1	/* Definitions of constants and data structure for POSIX 1003.1b-1993
     2	   scheduling interface.
     3	   Copyright (C) 1996-2026 Free Software Foundation, Inc.
     4	   This file is part of the GNU C Library.
     5	
     6	   The GNU C Library is free software; you can redistribute it and/or
     7	   modify it under the terms of the GNU Lesser General Public
     8	   License as published by the Free Software Foundation; either
     9	   version 2.1 of the License, or (at your option) any later version.
    10	
    11	   The GNU C Library is distributed in the hope that it will be useful,
    12	   but WITHOUT ANY WARRANTY; without even the implied warranty of
    13	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    14	   Lesser General Public License for more details.
    15	
    16	   You should have received a copy of the GNU Lesser General Public
    17	   License along with the GNU C Library; if not, see
    18	   <https://www.gnu.org/licenses/>.  */
    19	
    20	#ifndef _BITS_SCHED_H
    21	#define _BITS_SCHED_H 1
    22	
    23	#ifndef _SCHED_H
    24	# error "Never include <bits/sched.h> directly; use <sched.h> instead."
    25	#endif
    26	
    27	/* Scheduling algorithms.  */
    28	#define SCHED_OTHER		0
    29	#define SCHED_FIFO		1
    30	#define SCHED_RR		2
    31	#ifdef __USE_GNU
    32	# define SCHED_NORMAL		0
    33	# define SCHED_BATCH		3
    34	# define SCHED_ISO		4
    35	# define SCHED_IDLE		5
    36	# define SCHED_DEADLINE		6
    37	# define SCHED_EXT		7
    38	
    39	/* Flags that can be used in policy values.  */
    40	# define SCHED_RESET_ON_FORK	0x40000000
    41	
    42	/* Flags for the sched_flags field in struct sched_attr.   */
    43	#define SCHED_FLAG_RESET_ON_FORK	0x01
    44	#define SCHED_FLAG_RECLAIM		0x02
    45	#define SCHED_FLAG_DL_OVERRUN		0x04
    46	#define SCHED_FLAG_KEEP_POLICY		0x08
    47	#define SCHED_FLAG_KEEP_PARAMS		0x10
    48	#define SCHED_FLAG_UTIL_CLAMP_MIN	0x20
    49	#define SCHED_FLAG_UTIL_CLAMP_MAX	0x40
    50	
    51	/* Combinations of sched_flags fields.  */
    52	#define SCHED_FLAG_KEEP_ALL \
    53	  (SCHED_FLAG_KEEP_POLICY | SCHED_FLAG_KEEP_PARAMS)
    54	#define SCHED_FLAG_UTIL_CLAMP \
    55	  (SCHED_FLAG_UTIL_CLAMP_MIN | SCHED_FLAG_UTIL_CLAMP_MAX)
    56	
    57	/* Use "" to work around incorrect macro expansion of the
    58	   __has_include argument (GCC PR 80005).  */
    59	# ifdef __has_include
    60	#  if __has_include ("linux/sched/types.h")
    61	/* Some older Linux versions defined sched_param in <linux/sched/types.h>.  */
    62	#   define sched_param __glibc_mask_sched_param
    63	#   include <linux/sched/types.h>
    64	#   undef sched_param
    65	#  endif
    66	# endif
    67	# ifndef SCHED_ATTR_SIZE_VER0
    68	#  include <linux/types.h>
    69	#  define SCHED_ATTR_SIZE_VER0 48
    70	#  define SCHED_ATTR_SIZE_VER1 56
    71	struct sched_attr
    72	{
    73	  __u32 size;
    74	  __u32 sched_policy;
    75	  __u64 sched_flags;
    76	  __s32 sched_nice;
    77	  __u32 sched_priority;
    78	  __u64 sched_runtime;
    79	  __u64 sched_deadline;
    80	  __u64 sched_period;
    81	  __u32 sched_util_min;
    82	  __u32 sched_util_max;
    83	  /* Additional fields may be added at the end.  */
    84	};
    85	# endif /* !SCHED_ATTR_SIZE_VER0 */
    86	
    87	/* Cloning flags.  */
    88	# define CSIGNAL       0x000000ff /* Signal mask to be sent at exit.  */
    89	# define CLONE_VM      0x00000100 /* Set if VM shared between processes.  */
    90	# define CLONE_FS      0x00000200 /* Set if fs info shared between processes.  */
    91	# define CLONE_FILES   0x00000400 /* Set if open files shared between processes.  */
    92	# define CLONE_SIGHAND 0x00000800 /* Set if signal handlers shared.  */
    93	# define CLONE_PIDFD   0x00001000 /* Set if a pidfd should be placed
    94					     in parent.  */
    95	# define CLONE_PTRACE  0x00002000 /* Set if tracing continues on the child.  */
    96	# define CLONE_VFORK   0x00004000 /* Set if the parent wants the child to
    97					     wake it up on mm_release.  */
    98	# define CLONE_PARENT  0x00008000 /* Set if we want to have the same
    99					     parent as the cloner.  */
   100	# define CLONE_THREAD  0x00010000 /* Set to add to same thread group.  */
   101	# define CLONE_NEWNS   0x00020000 /* Set to create new namespace.  */
   102	# define CLONE_SYSVSEM 0x00040000 /* Set to shared SVID SEM_UNDO semantics.  */
   103	# define CLONE_SETTLS  0x00080000 /* Set TLS info.  */
   104	# define CLONE_PARENT_SETTID 0x00100000 /* Store TID in userlevel buffer
   105						   before MM copy.  */
   106	# define CLONE_CHILD_CLEARTID 0x00200000 /* Register exit futex and memory
   107						    location to clear.  */
   108	# define CLONE_DETACHED 0x00400000 /* Create clone detached.  */
   109	# define CLONE_UNTRACED 0x00800000 /* Set if the tracing process can't
   110					      force CLONE_PTRACE on this clone.  */
   111	# define CLONE_CHILD_SETTID 0x01000000 /* Store TID in userlevel buffer in
   112						  the child.  */
   113	# define CLONE_NEWCGROUP    0x02000000	/* New cgroup namespace.  */
   114	# define CLONE_NEWUTS	0x04000000	/* New utsname group.  */
   115	# define CLONE_NEWIPC	0x08000000	/* New ipcs.  */
   116	# define CLONE_NEWUSER	0x10000000	/* New user namespace.  */
   117	# define CLONE_NEWPID	0x20000000	/* New pid namespace.  */
   118	# define CLONE_NEWNET	0x40000000	/* New network namespace.  */
   119	# define CLONE_IO	0x80000000	/* Clone I/O context.  */
   120	
   121	/* cloning flags intersect with CSIGNAL so can be used only with unshare and
   122	   clone3 syscalls.  */
   123	#define CLONE_NEWTIME	0x00000080      /* New time namespace */
   124	#endif
   125	
   126	#include <bits/types/struct_sched_param.h>
   127	
   128	__BEGIN_DECLS
   129	
   130	#ifdef __USE_GNU
   131	/* Clone current process.  */
   132	extern int clone (int (*__fn) (void *__arg), void *__child_stack,
   133			  int __flags, void *__arg, ...) __THROW;
   134	
   135	/* Unshare the specified resources.  */
   136	extern int unshare (int __flags) __THROW;
   137	
   138	/* Get index of currently used CPU.  */
   139	extern int sched_getcpu (void) __THROW;
   140	
   141	/* Get currently used CPU and NUMA node.  */
   142	extern int getcpu (unsigned int *, unsigned int *) __THROW;
   143	
   144	/* Switch process to namespace of type NSTYPE indicated by FD.  */
   145	extern int setns (int __fd, int __nstype) __THROW;
   146	
   147	/* Apply the scheduling attributes from *ATTR to the process or thread TID.  */
   148	int sched_setattr (pid_t tid, struct sched_attr *attr, unsigned int flags)
   149	  __THROW __nonnull ((2));
   150	
   151	/* Obtain the scheduling attributes of the process or thread TID and
   152	   store it in *ATTR.  */
   153	int sched_getattr (pid_t tid, struct sched_attr *attr, unsigned int size,
   154			   unsigned int flags)
   155	  __THROW __nonnull ((2));
   156	
   157	#endif
   158	
   159	__END_DECLS
   160	
   161	#endif /* bits/sched.h */