1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
#ifndef LIBPSX_H
#define LIBPSX_H
/*
* Copyright (c) 2025 Andrew G. Morgan <morgan@kernel.org>
*
* These header definitions are private to the PSX mechanism. External
* API references are to be found in <sys/psx_syscall.h>
*
* Since we no longer (libcap-2.72) operate at the pthreads
* abstraction, we need our own mutex etc implementation.
*/
typedef unsigned char psx_mutex_t;
#define _psx_mu_blocked(x) \
__atomic_test_and_set((void *)(x), __ATOMIC_SEQ_CST)
#define _psx_mu_lock(x) \
while (_psx_mu_blocked(x)) sched_yield()
#define _psx_mu_unlock(x) \
__atomic_clear((void *)(x), __ATOMIC_SEQ_CST)
#define _psx_mu_unlock_return(x, y) \
do { _psx_mu_unlock(x); return (y); } while (0)
#define _psx_mu_cond_wait(x) \
do { \
_psx_mu_unlock(x); \
sched_yield(); \
_psx_mu_lock(x); \
} while (0)
/* Not reliably defined by *libc so, alias the direct syscall. */
#define _psx_gettid() syscall(SYS_gettid)
extern void psx_lock(void);
extern void psx_unlock(void);
extern void psx_cond_wait(void);
extern long psx_mix(long value);
typedef enum {
_PSX_IDLE = 0,
_PSX_SETUP = 1,
_PSX_SYSCALL = 2,
_PSX_EXITING = 3,
} psx_tracker_state_t;
/*
* Tracking threads is done via a hash map of these objects.
*/
typedef struct psx_thread_ref_s {
long sweep;
long pending;
long tid;
long retval;
} psx_thread_ref_t;
/*
* This global structure holds the global coordination state for
* libcap's psx_syscall() support.
*/
typedef struct {
long pid;
char *pid_path;
psx_mutex_t state_mu;
psx_tracker_state_t state;
int initialized;
int incomplete;
int psx_sig;
int force_failure; /* leave this as zero to avoid forcing a crash */
psx_sensitivity_t sensitivity;
struct {
long syscall_nr;
long arg1, arg2, arg3, arg4, arg5, arg6;
int six;
int active;
} cmd;
/* This is kept opaque here, but its details are known to psx_calls.c */
void *actions;
int map_entries;
long map_mask;
psx_thread_ref_t *map;
} psx_tracker_t;
/* defined in psx_calls.c */
extern psx_tracker_t psx_tracker;
extern int psx_actions_size(void);
extern void psx_confirm_sigaction(void);
#endif /* def LIBPSX_H */
|
