1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _LINUX_SCHED_H
3#define _LINUX_SCHED_H
4
5#include <linux/types.h>
6
7/*
8 * cloning flags:
9 */
10#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
11#define CLONE_VM 0x00000100 /* set if VM shared between processes */
12#define CLONE_FS 0x00000200 /* set if fs info shared between processes */
13#define CLONE_FILES 0x00000400 /* set if open files shared between processes */
14#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
15#define CLONE_PIDFD 0x00001000 /* set if a pidfd should be placed in parent */
16#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
17#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
18#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
19#define CLONE_THREAD 0x00010000 /* Same thread group? */
20#define CLONE_NEWNS 0x00020000 /* New mount namespace group */
21#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
22#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
23#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
24#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
25#define CLONE_DETACHED 0x00400000 /* Unused, ignored */
26#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
27#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
28#define CLONE_NEWCGROUP 0x02000000 /* New cgroup namespace */
29#define CLONE_NEWUTS 0x04000000 /* New utsname namespace */
30#define CLONE_NEWIPC 0x08000000 /* New ipc namespace */
31#define CLONE_NEWUSER 0x10000000 /* New user namespace */
32#define CLONE_NEWPID 0x20000000 /* New pid namespace */
33#define CLONE_NEWNET 0x40000000 /* New network namespace */
34#define CLONE_IO 0x80000000 /* Clone io context */
35
36/* Flags for the clone3() syscall. */
37#define CLONE_CLEAR_SIGHAND 0x100000000ULL /* Clear any signal handler and reset to SIG_DFL. */
38#define CLONE_INTO_CGROUP 0x200000000ULL /* Clone into a specific cgroup given the right permissions. */
39
40/*
41 * cloning flags intersect with CSIGNAL so can be used with unshare and clone3
42 * syscalls only:
43 */
44#define CLONE_NEWTIME 0x00000080 /* New time namespace */
45
46#ifndef __ASSEMBLY__
47/**
48 * struct clone_args - arguments for the clone3 syscall
49 * @flags: Flags for the new process as listed above.
50 * All flags are valid except for CSIGNAL and
51 * CLONE_DETACHED.
52 * @pidfd: If CLONE_PIDFD is set, a pidfd will be
53 * returned in this argument.
54 * @child_tid: If CLONE_CHILD_SETTID is set, the TID of the
55 * child process will be returned in the child's
56 * memory.
57 * @parent_tid: If CLONE_PARENT_SETTID is set, the TID of
58 * the child process will be returned in the
59 * parent's memory.
60 * @exit_signal: The exit_signal the parent process will be
61 * sent when the child exits.
62 * @stack: Specify the location of the stack for the
63 * child process.
64 * Note, @stack is expected to point to the
65 * lowest address. The stack direction will be
66 * determined by the kernel and set up
67 * appropriately based on @stack_size.
68 * @stack_size: The size of the stack for the child process.
69 * @tls: If CLONE_SETTLS is set, the tls descriptor
70 * is set to tls.
71 * @set_tid: Pointer to an array of type *pid_t. The size
72 * of the array is defined using @set_tid_size.
73 * This array is used to select PIDs/TIDs for
74 * newly created processes. The first element in
75 * this defines the PID in the most nested PID
76 * namespace. Each additional element in the array
77 * defines the PID in the parent PID namespace of
78 * the original PID namespace. If the array has
79 * less entries than the number of currently
80 * nested PID namespaces only the PIDs in the
81 * corresponding namespaces are set.
82 * @set_tid_size: This defines the size of the array referenced
83 * in @set_tid. This cannot be larger than the
84 * kernel's limit of nested PID namespaces.
85 * @cgroup: If CLONE_INTO_CGROUP is specified set this to
86 * a file descriptor for the cgroup.
87 *
88 * The structure is versioned by size and thus extensible.
89 * New struct members must go at the end of the struct and
90 * must be properly 64bit aligned.
91 */
92struct clone_args {
93 __aligned_u64 flags;
94 __aligned_u64 pidfd;
95 __aligned_u64 child_tid;
96 __aligned_u64 parent_tid;
97 __aligned_u64 exit_signal;
98 __aligned_u64 stack;
99 __aligned_u64 stack_size;
100 __aligned_u64 tls;
101 __aligned_u64 set_tid;
102 __aligned_u64 set_tid_size;
103 __aligned_u64 cgroup;
104};
105#endif
106
107#define CLONE_ARGS_SIZE_VER0 64 /* sizeof first published struct */
108#define CLONE_ARGS_SIZE_VER1 80 /* sizeof second published struct */
109#define CLONE_ARGS_SIZE_VER2 88 /* sizeof third published struct */
110
111/*
112 * Scheduling policies
113 */
114#define SCHED_NORMAL 0
115#define SCHED_FIFO 1
116#define SCHED_RR 2
117#define SCHED_BATCH 3
118/* SCHED_ISO: reserved but not implemented yet */
119#define SCHED_IDLE 5
120#define SCHED_DEADLINE 6
121
122/* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
123#define SCHED_RESET_ON_FORK 0x40000000
124
125/*
126 * For the sched_{set,get}attr() calls
127 */
128#define SCHED_FLAG_RESET_ON_FORK 0x01
129#define SCHED_FLAG_RECLAIM 0x02
130#define SCHED_FLAG_DL_OVERRUN 0x04
131#define SCHED_FLAG_KEEP_POLICY 0x08
132#define SCHED_FLAG_KEEP_PARAMS 0x10
133#define SCHED_FLAG_UTIL_CLAMP_MIN 0x20
134#define SCHED_FLAG_UTIL_CLAMP_MAX 0x40
135
136#define SCHED_FLAG_KEEP_ALL (SCHED_FLAG_KEEP_POLICY | \
137 SCHED_FLAG_KEEP_PARAMS)
138
139#define SCHED_FLAG_UTIL_CLAMP (SCHED_FLAG_UTIL_CLAMP_MIN | \
140 SCHED_FLAG_UTIL_CLAMP_MAX)
141
142#define SCHED_FLAG_ALL (SCHED_FLAG_RESET_ON_FORK | \
143 SCHED_FLAG_RECLAIM | \
144 SCHED_FLAG_DL_OVERRUN | \
145 SCHED_FLAG_KEEP_ALL | \
146 SCHED_FLAG_UTIL_CLAMP)
147
148#endif /* _LINUX_SCHED_H */
149

source code of include/linux/sched.h