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File psx_syscall.h

/*
 * 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 */

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-06-12 01:10:56
..	DIR	-	drwxr-xr-x	2025-06-25 01:10:46
acct.h	text/x-c	3.22 KB	-rw-r--r--	2025-06-09 08:25:26
auxv.h	text/x-c	1.23 KB	-rw-r--r--	2025-06-09 08:25:26
bitypes.h	text/x-c	86 B	-rw-r--r--	2025-06-09 08:25:39
capability.h	text/x-c	7.06 KB	-rw-r--r--	2024-01-10 02:34:46
cdefs.h	text/x-c	20.2 KB	-rw-r--r--	2025-06-09 08:25:26
debugreg.h	text/x-c	3.49 KB	-rw-r--r--	2025-06-09 08:25:26
dir.h	text/x-c	921 B	-rw-r--r--	2025-06-09 08:25:26
elf.h	text/x-c	1023 B	-rw-r--r--	2025-06-09 08:25:26
epoll.h	text/x-c	4.31 KB	-rw-r--r--	2025-06-09 08:25:26
errno.h	text/x-c	19 B	-rw-r--r--	2025-06-09 08:25:24
eventfd.h	text/x-c	1.37 KB	-rw-r--r--	2025-06-09 08:25:26
fanotify.h	text/x-c	1.26 KB	-rw-r--r--	2025-06-09 08:25:26
fcntl.h	text/x-c	19 B	-rw-r--r--	2025-06-09 08:25:26
file.h	text/x-c	1.63 KB	-rw-r--r--	2025-06-09 08:25:26
fsuid.h	text/x-c	1.16 KB	-rw-r--r--	2025-06-09 08:25:26
gmon.h	text/x-c	6.08 KB	-rw-r--r--	2025-06-09 08:25:26
gmon_out.h	text/x-c	2.57 KB	-rw-r--r--	2025-06-09 08:25:26
inotify.h	text/x-c	3.75 KB	-rw-r--r--	2025-06-09 08:25:26
io.h	text/x-c	4.97 KB	-rw-r--r--	2025-06-09 08:25:26
ioctl.h	text/x-c	1.7 KB	-rw-r--r--	2025-06-09 08:25:26
ipc.h	text/x-c	1.43 KB	-rw-r--r--	2025-06-09 08:25:26
kd.h	text/x-c	1.08 KB	-rw-r--r--	2025-06-09 08:25:26
klog.h	text/x-c	1.17 KB	-rw-r--r--	2025-06-09 08:25:26
mman.h	text/x-c	5.42 KB	-rw-r--r--	2025-06-09 08:25:26
mount.h	text/x-c	5.48 KB	-rw-r--r--	2025-06-09 08:25:26
msg.h	text/x-c	2.31 KB	-rw-r--r--	2025-06-09 08:25:26
mtio.h	text/x-c	10.9 KB	-rw-r--r--	2025-06-09 08:25:26
param.h	text/x-c	3.07 KB	-rw-r--r--	2025-06-09 08:25:26
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personality.h	text/x-c	2.66 KB	-rw-r--r--	2025-06-09 08:25:26
poll.h	text/x-c	2.49 KB	-rw-r--r--	2025-06-09 08:25:26
prctl.h	text/x-c	1.03 KB	-rw-r--r--	2025-06-09 08:25:26
procfs.h	text/x-c	4.87 KB	-rw-r--r--	2025-06-09 08:25:38
profil.h	text/x-c	1.91 KB	-rw-r--r--	2025-06-09 08:25:26
psx_syscall.h	text/x-c	2.77 KB	-rw-r--r--	2024-01-10 02:34:46
ptrace.h	text/x-c	5.85 KB	-rw-r--r--	2025-06-09 08:25:26
queue.h	text/x-c	19.08 KB	-rw-r--r--	2025-06-09 08:25:26
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random.h	text/x-c	1.41 KB	-rw-r--r--	2025-06-09 08:25:24
raw.h	text/x-c	1.15 KB	-rw-r--r--	2025-06-09 08:25:26
reboot.h	text/x-c	1.59 KB	-rw-r--r--	2025-06-09 08:25:26
reg.h	text/x-c	1.78 KB	-rw-r--r--	2025-06-09 08:25:26
resource.h	text/x-c	3.56 KB	-rw-r--r--	2025-06-09 08:25:26
sdt-config.h	text/plain	276 B	-rw-r--r--	2023-10-14 01:06:47
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select.h	text/x-c	4.04 KB	-rw-r--r--	2025-06-09 08:25:26
sem.h	text/x-c	1.99 KB	-rw-r--r--	2025-06-09 08:25:26
sendfile.h	text/x-c	1.76 KB	-rw-r--r--	2025-06-09 08:25:26
shm.h	text/x-c	1.83 KB	-rw-r--r--	2025-06-09 08:25:26
signal.h	text/x-c	20 B	-rw-r--r--	2025-06-09 08:25:24
signalfd.h	text/x-c	1.56 KB	-rw-r--r--	2025-06-09 08:25:26
socket.h	text/x-c	9.96 KB	-rw-r--r--	2025-06-09 08:25:26
socketvar.h	text/x-c	141 B	-rw-r--r--	2025-06-09 08:25:26
soundcard.h	text/x-c	29 B	-rw-r--r--	2025-06-09 08:25:26
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swap.h	text/x-c	1.55 KB	-rw-r--r--	2025-06-09 08:25:26
syscall.h	text/x-c	1.3 KB	-rw-r--r--	2025-06-09 08:25:26
sysctl.h	text/x-c	1.96 KB	-rw-r--r--	2025-06-09 08:25:26
sysinfo.h	text/x-c	1.48 KB	-rw-r--r--	2025-06-09 08:25:26
syslog.h	text/x-c	7.52 KB	-rw-r--r--	2025-06-09 08:25:26
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termios.h	text/x-c	74 B	-rw-r--r--	2025-06-09 08:25:26
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timerfd.h	text/x-c	1.83 KB	-rw-r--r--	2025-06-09 08:25:26
times.h	text/x-c	1.56 KB	-rw-r--r--	2025-06-09 08:25:25
timex.h	text/x-c	2.15 KB	-rw-r--r--	2025-06-09 08:25:25
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ttydefaults.h	text/x-c	3.48 KB	-rw-r--r--	2025-06-09 08:25:26
types.h	text/x-c	5.58 KB	-rw-r--r--	2025-06-09 08:25:25
ucontext.h	text/x-c	5.7 KB	-rw-r--r--	2025-06-09 08:25:24
uio.h	text/x-c	6.13 KB	-rw-r--r--	2025-06-09 08:25:26
un.h	text/x-c	1.42 KB	-rw-r--r--	2025-06-09 08:25:26
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user.h	text/x-c	5.08 KB	-rw-r--r--	2025-06-09 08:25:26
utsname.h	text/x-c	2.42 KB	-rw-r--r--	2025-06-09 08:25:25
vfs.h	text/x-c	161 B	-rw-r--r--	2025-06-09 08:25:26
vlimit.h	text/x-c	1.83 KB	-rw-r--r--	2025-06-09 08:25:26
vm86.h	text/x-c	1.17 KB	-rw-r--r--	2025-06-09 08:25:26
vt.h	text/x-c	22 B	-rw-r--r--	2025-06-09 08:25:26
vtimes.h	text/x-c	2.4 KB	-rw-r--r--	2025-06-09 08:25:26
wait.h	text/x-c	5.47 KB	-rw-r--r--	2025-06-09 08:25:25
xattr.h	text/x-c	4.17 KB	-rw-r--r--	2025-06-09 08:25:26

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