FM / sys

/usr/include/sys

Name	Size	Mode	Actions
acct.h	3296	0644	edit dl rm
auxv.h	1259	0644	edit dl rm
bitypes.h	86	0644	edit dl rm
capability.h	7233	0644	edit dl rm
cdefs.h	20682	0644	edit dl rm
debugreg.h	3575	0644	edit dl rm
dir.h	921	0644	edit dl rm
elf.h	1023	0644	edit dl rm
epoll.h	4410	0644	edit dl rm
errno.h	19	0644	edit dl rm
eventfd.h	1399	0644	edit dl rm
fanotify.h	1291	0644	edit dl rm
fcntl.h	19	0644	edit dl rm
file.h	1674	0644	edit dl rm
fsuid.h	1187	0644	edit dl rm
gmon.h	6230	0644	edit dl rm
gmon_out.h	2635	0644	edit dl rm
inotify.h	3837	0644	edit dl rm
io.h	5085	0644	edit dl rm
ioctl.h	1739	0644	edit dl rm
ipc.h	1461	0644	edit dl rm
kd.h	1111	0644	edit dl rm
klog.h	1203	0644	edit dl rm
mman.h	5551	0644	edit dl rm
mount.h	5611	0644	edit dl rm
msg.h	2365	0644	edit dl rm
mtio.h	11162	0644	edit dl rm
param.h	3148	0644	edit dl rm
pci.h	922	0644	edit dl rm
perm.h	1126	0644	edit dl rm
personality.h	2722	0644	edit dl rm
poll.h	2549	0644	edit dl rm
prctl.h	1058	0644	edit dl rm
procfs.h	4985	0644	edit dl rm
profil.h	1958	0644	edit dl rm
psx_syscall.h	2833	0644	edit dl rm
ptrace.h	5988	0644	edit dl rm
queue.h	19539	0644	edit dl rm
quota.h	5172	0644	edit dl rm
random.h	1443	0644	edit dl rm
raw.h	1181	0644	edit dl rm
reboot.h	1632	0644	edit dl rm
reg.h	1826	0644	edit dl rm
resource.h	3645	0644	edit dl rm
sdt-config.h	276	0644	edit dl rm
sdt.h	22157	0644	edit dl rm
select.h	4140	0644	edit dl rm
sem.h	2036	0644	edit dl rm
sendfile.h	1805	0644	edit dl rm
shm.h	1873	0644	edit dl rm
signal.h	20	0644	edit dl rm
signalfd.h	1599	0644	edit dl rm
socket.h	10203	0644	edit dl rm
socketvar.h	141	0644	edit dl rm
soundcard.h	29	0644	edit dl rm
stat.h	16236	0644	edit dl rm
statfs.h	2093	0644	edit dl rm
statvfs.h	2819	0644	edit dl rm
swap.h	1592	0644	edit dl rm
syscall.h	1335	0644	edit dl rm
sysctl.h	2004	0644	edit dl rm
sysinfo.h	1517	0644	edit dl rm
syslog.h	7702	0644	edit dl rm
sysmacros.h	2102	0644	edit dl rm
termios.h	74	0644	edit dl rm
time.h	6656	0644	edit dl rm
timeb.h	1376	0644	edit dl rm
timerfd.h	1873	0644	edit dl rm
times.h	1596	0644	edit dl rm
timex.h	2205	0644	edit dl rm
ttychars.h	2499	0644	edit dl rm
ttydefaults.h	3568	0644	edit dl rm
types.h	5712	0644	edit dl rm
ucontext.h	5841	0644	edit dl rm
uio.h	6279	0644	edit dl rm
un.h	1452	0644	edit dl rm
unistd.h	20	0644	edit dl rm
user.h	5207	0644	edit dl rm
utsname.h	2480	0644	edit dl rm
vfs.h	161	0644	edit dl rm
vlimit.h	1879	0644	edit dl rm
vm86.h	1198	0644	edit dl rm
vt.h	22	0644	edit dl rm
vtimes.h	2462	0644	edit dl rm
wait.h	5604	0644	edit dl rm
xattr.h	4274	0644	edit dl rm

Edit: /usr/include/sys/psx_syscall.h (2833B)

/*
 * Copyright (c) 2019 Andrew G. Morgan <morgan@kernel.org>
 *
 * This header, and the -lpsx library, provide a number of things to
 * support POSIX semantics for syscalls associated with the pthread
 * library. Linking this code is tricky and is done as follows:
 *
 *     ld ... -lpsx -lpthread --wrap=pthread_create
 * or, gcc ... -lpsx -lpthread -Wl,-wrap,pthread_create
 *
 * glibc provides a subset of this functionality natively through the
 * nptl:setxid mechanism and could implement psx_syscall() directly
 * using that style of functionality but, as of 2019-11-30, the setxid
 * mechanism is limited to 9 specific set*() syscalls that do not
 * support the syscall6 API (needed for prctl functions and the ambient
 * capabilities set for example).
 */

#ifndef _SYS_PSX_SYSCALL_H
#define _SYS_PSX_SYSCALL_H

#ifdef __cplusplus
extern "C" {
#endif

#include <pthread.h>

/*
 * psx_syscall performs the specified syscall on all psx registered
 * threads. The mechanism by which this occurs is much less efficient
 * than a standard system call on Linux, so it should only be used
 * when POSIX semantics are required to change process relevant
 * security state.
 *
 * Glibc has native support for POSIX semantics on setgroups() and the
 * 8 set*[gu]id() functions. So, there is no need to use psx_syscall()
 * for these calls. This call exists for all the other system calls
 * that need to maintain parity on all pthreads of a program.
 *
 * Some macrology is used to allow the caller to provide only as many
 * arguments as needed, thus psx_syscall() cannot be used as a
 * function pointer. For those situations, we define psx_syscall3()
 * and psx_syscall6().
 */
#define psx_syscall(syscall_nr, ...) \
    __psx_syscall(syscall_nr, __VA_ARGS__, (long int) 6, (long int) 5, \
		  (long int) 4, (long int) 3, (long int) 2, \
		  (long int) 1, (long int) 0)
long int __psx_syscall(long int syscall_nr, ...);
long int psx_syscall3(long int syscall_nr,
		      long int arg1, long int arg2, long int arg3);
long int psx_syscall6(long int syscall_nr,
		      long int arg1, long int arg2, long int arg3,
		      long int arg4, long int arg5, long int arg6);

/*
 * This function should be used by systems to obtain pointers to the
 * two syscall functions provided by the PSX library. A linkage trick
 * is to define this function as weak in a library that can optionally
 * use libpsx and then, should the caller link -lpsx, that library can
 * implicitly use these POSIX semantics syscalls. See libcap for an
 * example of this useage.
 */
void psx_load_syscalls(long int (**syscall_fn)(long int,
					       long int, long int, long int),
		       long int (**syscall6_fn)(long int,
						long int, long int, long int,
						long int, long int, long int));

#ifdef __cplusplus
}
#endif

#endif /* _SYS_PSX_SYSCALL_H */

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