FM / sys

/usr/include/sys

Name	Size	Mode	Actions
platform/	-	0755	rm
acct.h	3302	0644	edit dl rm
auxv.h	1260	0644	edit dl rm
bitypes.h	86	0644	edit dl rm
cdefs.h	26257	0644	edit dl rm
debugreg.h	3576	0644	edit dl rm
dir.h	922	0644	edit dl rm
elf.h	1024	0644	edit dl rm
epoll.h	5076	0644	edit dl rm
errno.h	19	0644	edit dl rm
eventfd.h	1400	0644	edit dl rm
fanotify.h	1292	0644	edit dl rm
fcntl.h	19	0644	edit dl rm
file.h	1675	0644	edit dl rm
fsuid.h	1188	0644	edit dl rm
gmon.h	6230	0644	edit dl rm
gmon_out.h	2636	0644	edit dl rm
inotify.h	3901	0644	edit dl rm
io.h	5086	0644	edit dl rm
ioctl.h	2027	0644	edit dl rm
ipc.h	1462	0644	edit dl rm
kd.h	1112	0644	edit dl rm
klog.h	1204	0644	edit dl rm
mman.h	5552	0644	edit dl rm
mount.h	5706	0644	edit dl rm
msg.h	2623	0644	edit dl rm
mtio.h	11163	0644	edit dl rm
param.h	3149	0644	edit dl rm
pci.h	923	0644	edit dl rm
perm.h	1127	0644	edit dl rm
personality.h	2723	0644	edit dl rm
poll.h	3025	0644	edit dl rm
prctl.h	1795	0644	edit dl rm
procfs.h	4338	0644	edit dl rm
profil.h	1959	0644	edit dl rm
ptrace.h	6126	0644	edit dl rm
queue.h	19539	0644	edit dl rm
quota.h	5173	0644	edit dl rm
random.h	1471	0644	edit dl rm
raw.h	1182	0644	edit dl rm
reboot.h	1633	0644	edit dl rm
reg.h	1827	0644	edit dl rm
resource.h	4034	0644	edit dl rm
rseq.h	6405	0644	edit dl rm
select.h	5039	0644	edit dl rm
sem.h	2660	0644	edit dl rm
sendfile.h	1806	0644	edit dl rm
shm.h	2131	0644	edit dl rm
signal.h	20	0644	edit dl rm
signalfd.h	1714	0644	edit dl rm
single_threaded.h	1182	0644	edit dl rm
socket.h	12382	0644	edit dl rm
socketvar.h	141	0644	edit dl rm
soundcard.h	29	0644	edit dl rm
stat.h	13735	0644	edit dl rm
statfs.h	2094	0644	edit dl rm
statvfs.h	2821	0644	edit dl rm
swap.h	1593	0644	edit dl rm
syscall.h	1256	0644	edit dl rm
sysinfo.h	1518	0644	edit dl rm
syslog.h	7786	0644	edit dl rm
sysmacros.h	2103	0644	edit dl rm
termios.h	74	0644	edit dl rm
time.h	9139	0644	edit dl rm
timeb.h	1155	0644	edit dl rm
timerfd.h	2583	0644	edit dl rm
times.h	1597	0644	edit dl rm
timex.h	2839	0644	edit dl rm
ttychars.h	2499	0644	edit dl rm
ttydefaults.h	3568	0644	edit dl rm
types.h	5713	0644	edit dl rm
ucontext.h	5842	0644	edit dl rm
uio.h	6796	0644	edit dl rm
un.h	1453	0644	edit dl rm
unistd.h	20	0644	edit dl rm
user.h	5208	0644	edit dl rm
utsname.h	2481	0644	edit dl rm
vfs.h	161	0644	edit dl rm
vlimit.h	1880	0644	edit dl rm
vm86.h	1199	0644	edit dl rm
vt.h	22	0644	edit dl rm
wait.h	6233	0644	edit dl rm
xattr.h	4275	0644	edit dl rm

Edit: /usr/include/sys/rseq.h (6405B)

/* Restartable Sequences exported symbols.  Linux header.
   Copyright (C) 2021 Free Software Foundation, Inc.

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; if not, see
   <https://www.gnu.org/licenses/>.  */

#ifndef _SYS_RSEQ_H
#define _SYS_RSEQ_H	1

/* Architecture-specific rseq signature.  */
#include <bits/rseq.h>

#include <stddef.h>
#include <stdint.h>
#include <sys/cdefs.h>

#ifdef __has_include
# if __has_include ("linux/rseq.h")
#  define __GLIBC_HAVE_KERNEL_RSEQ
# endif
#else
# include <linux/version.h>
# if LINUX_VERSION_CODE >= KERNEL_VERSION (4, 18, 0)
#  define __GLIBC_HAVE_KERNEL_RSEQ
# endif
#endif

#ifdef __GLIBC_HAVE_KERNEL_RSEQ
/* We use the structures declarations from the kernel headers.  */
# include <linux/rseq.h>
#else /* __GLIBC_HAVE_KERNEL_RSEQ */
/* We use a copy of the include/uapi/linux/rseq.h kernel header.  */

enum rseq_cpu_id_state
  {
    RSEQ_CPU_ID_UNINITIALIZED = -1,
    RSEQ_CPU_ID_REGISTRATION_FAILED = -2,
  };

enum rseq_flags
  {
    RSEQ_FLAG_UNREGISTER = (1 << 0),
  };

enum rseq_cs_flags_bit
  {
    RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT = 0,
    RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT = 1,
    RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT = 2,
  };

enum rseq_cs_flags
  {
    RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT =
      (1U << RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT),
    RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL =
      (1U << RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT),
    RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE =
      (1U << RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT),
  };

/* struct rseq_cs is aligned on 32 bytes to ensure it is always
   contained within a single cache-line.  It is usually declared as
   link-time constant data.  */
struct rseq_cs
  {
    /* Version of this structure.  */
    uint32_t version;
    /* enum rseq_cs_flags.  */
    uint32_t flags;
    uint64_t start_ip;
    /* Offset from start_ip.  */
    uint64_t post_commit_offset;
    uint64_t abort_ip;
  } __attribute__ ((__aligned__ (32)));

/* struct rseq is aligned on 32 bytes to ensure it is always
   contained within a single cache-line.

A single struct rseq per thread is allowed.  */
struct rseq
  {
    /* Restartable sequences cpu_id_start field.  Updated by the
       kernel.  Read by user-space with single-copy atomicity
       semantics.  This field should only be read by the thread which
       registered this data structure.  Aligned on 32-bit.  Always
       contains a value in the range of possible CPUs, although the
       value may not be the actual current CPU (e.g. if rseq is not
       initialized).  This CPU number value should always be compared
       against the value of the cpu_id field before performing a rseq
       commit or returning a value read from a data structure indexed
       using the cpu_id_start value.  */
    uint32_t cpu_id_start;
    /* Restartable sequences cpu_id field.  Updated by the kernel.
       Read by user-space with single-copy atomicity semantics.  This
       field should only be read by the thread which registered this
       data structure.  Aligned on 32-bit.  Values
       RSEQ_CPU_ID_UNINITIALIZED and RSEQ_CPU_ID_REGISTRATION_FAILED
       have a special semantic: the former means "rseq uninitialized",
       and latter means "rseq initialization failed".  This value is
       meant to be read within rseq critical sections and compared
       with the cpu_id_start value previously read, before performing
       the commit instruction, or read and compared with the
       cpu_id_start value before returning a value loaded from a data
       structure indexed using the cpu_id_start value.  */
    uint32_t cpu_id;
    /* Restartable sequences rseq_cs field.

Contains NULL when no critical section is active for the current
       thread, or holds a pointer to the currently active struct rseq_cs.

Updated by user-space, which sets the address of the currently
       active rseq_cs at the beginning of assembly instruction sequence
       block, and set to NULL by the kernel when it restarts an assembly
       instruction sequence block, as well as when the kernel detects that
       it is preempting or delivering a signal outside of the range
       targeted by the rseq_cs.  Also needs to be set to NULL by user-space
       before reclaiming memory that contains the targeted struct rseq_cs.

Read and set by the kernel. Set by user-space with single-copy
       atomicity semantics. This field should only be updated by the
       thread which registered this data structure. Aligned on 64-bit.

32-bit architectures should update the low order bits of the
       rseq_cs field, leaving the high order bits initialized to 0.  */
    uint64_t rseq_cs;
    /* Restartable sequences flags field.

This field should only be updated by the thread which
       registered this data structure.  Read by the kernel.
       Mainly used for single-stepping through rseq critical sections
       with debuggers.

- RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT
           Inhibit instruction sequence block restart on preemption
           for this thread.
       - RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL
           Inhibit instruction sequence block restart on signal
           delivery for this thread.
       - RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE
           Inhibit instruction sequence block restart on migration for
           this thread.  */
    uint32_t flags;
  } __attribute__ ((__aligned__ (32)));

#endif /* __GLIBC_HAVE_KERNEL_RSEQ */

/* Offset from the thread pointer to the rseq area.  */
extern const ptrdiff_t __rseq_offset;

/* Size of the registered rseq area.  0 if the registration was
   unsuccessful.  */
extern const unsigned int __rseq_size;

/* Flags used during rseq registration.  */
extern const unsigned int __rseq_flags;

#endif /* sys/rseq.h */

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