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db0463bf | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
1f5596dd | 2 | |
3b5a3233 CB |
3 | #ifndef __LXCFS_BINDINGS_H |
4 | #define __LXCFS_BINDINGS_H | |
5 | ||
2c6e12b7 | 6 | #include "config.h" |
1f5596dd | 7 | |
285aea40 | 8 | #include <linux/types.h> |
dee86006 | 9 | #include <signal.h> |
2aa59b2e | 10 | #include <stdbool.h> |
1f5596dd CB |
11 | #include <stdio.h> |
12 | #include <stdlib.h> | |
13 | #include <sys/stat.h> | |
14 | #include <sys/types.h> | |
15 | #include <unistd.h> | |
16 | ||
bb4e3c8f | 17 | #include "lxcfs_fuse.h" |
0a5da718 | 18 | |
2aa59b2e | 19 | #include "cgroup_fuse.h" |
17e0e368 | 20 | #include "macro.h" |
1f5596dd CB |
21 | #include "proc_cpuview.h" |
22 | #include "proc_fuse.h" | |
23 | #include "proc_loadavg.h" | |
71f17cd2 | 24 | #include "sysfs_fuse.h" |
17e0e368 | 25 | |
237e200e | 26 | /* directory under which we mount the controllers - /run/lxcfs/controllers */ |
cc97d34c | 27 | #define BASEDIR RUNTIME_PATH "/lxcfs/controllers" |
8cb31294 | 28 | #define ROOTDIR RUNTIME_PATH "/lxcfs/root" |
237e200e | 29 | |
71f17cd2 YB |
30 | /* Maximum number for 64 bit integer is a string with 21 digits: 2^64 - 1 = 21 */ |
31 | #define LXCFS_NUMSTRLEN64 21 | |
32 | ||
71f17cd2 YB |
33 | enum lxcfs_virt_t { |
34 | LXC_TYPE_CGDIR, | |
35 | LXC_TYPE_CGFILE, | |
cbfc55fd | 36 | |
71f17cd2 | 37 | LXC_TYPE_PROC_MEMINFO, |
cbfc55fd CB |
38 | #define LXC_TYPE_PROC_MEMINFO_PATH "/proc/meminfo" |
39 | ||
71f17cd2 | 40 | LXC_TYPE_PROC_CPUINFO, |
cbfc55fd CB |
41 | #define LXC_TYPE_PROC_CPUINFO_PATH "/proc/cpuinfo" |
42 | ||
71f17cd2 | 43 | LXC_TYPE_PROC_UPTIME, |
cbfc55fd CB |
44 | #define LXC_TYPE_PROC_UPTIME_PATH "/proc/uptime" |
45 | ||
71f17cd2 | 46 | LXC_TYPE_PROC_STAT, |
cbfc55fd CB |
47 | #define LXC_TYPE_PROC_STAT_PATH "/proc/stat" |
48 | ||
71f17cd2 | 49 | LXC_TYPE_PROC_DISKSTATS, |
cbfc55fd CB |
50 | #define LXC_TYPE_PROC_DISKSTATS_PATH "/proc/diskstats" |
51 | ||
71f17cd2 | 52 | LXC_TYPE_PROC_SWAPS, |
cbfc55fd CB |
53 | #define LXC_TYPE_PROC_SWAPS_PATH "/proc/swaps" |
54 | ||
71f17cd2 | 55 | LXC_TYPE_PROC_LOADAVG, |
cbfc55fd CB |
56 | #define LXC_TYPE_PROC_LOADAVG_PATH "/proc/loadavg" |
57 | ||
6cc153e6 FS |
58 | LXC_TYPE_PROC_SLABINFO, |
59 | #define LXC_TYPE_PROC_SLABINFO_PATH "/proc/slabinfo" | |
60 | ||
26b717d0 | 61 | LXC_TYPE_SYS, |
71f17cd2 YB |
62 | LXC_TYPE_SYS_DEVICES, |
63 | LXC_TYPE_SYS_DEVICES_SYSTEM, | |
64 | LXC_TYPE_SYS_DEVICES_SYSTEM_CPU, | |
26b717d0 ZL |
65 | LXC_TYPE_SYS_DEVICES_SYSTEM_CPU_SUBDIR, |
66 | LXC_TYPE_SYS_DEVICES_SYSTEM_CPU_SUBFILE, | |
cbfc55fd | 67 | |
71f17cd2 | 68 | LXC_TYPE_SYS_DEVICES_SYSTEM_CPU_ONLINE, |
cbfc55fd | 69 | #define LXC_TYPE_SYS_DEVICES_SYSTEM_CPU_ONLINE_PATH "/sys/devices/system/cpu/online" |
71f17cd2 YB |
70 | }; |
71 | ||
72 | struct file_info { | |
73 | char *controller; | |
74 | char *cgroup; | |
75 | char *file; | |
76 | int type; | |
99b183fb | 77 | char *buf; /* unused */ |
71f17cd2 | 78 | int buflen; |
99b183fb | 79 | int size; /*actual data size */ |
71f17cd2 YB |
80 | int cached; |
81 | }; | |
82 | ||
7e60aa1b | 83 | struct lxcfs_opts { |
84 | bool swap_off; | |
2aa59b2e | 85 | bool use_pidfd; |
0274438c | 86 | bool use_cfs; |
285aea40 CB |
87 | /* |
88 | * Ideally we'd version by size but because of backwards compatability | |
89 | * and the use of bool instead of explicited __u32 and __u64 we can't. | |
90 | */ | |
91 | __u32 version; | |
7e60aa1b | 92 | }; |
93 | ||
84e184b1 CB |
94 | typedef enum lxcfs_opt_t { |
95 | LXCFS_SWAP_ON = 0, | |
96 | LXCFS_PIDFD_ON = 1, | |
97 | LXCFS_CFS_ON = 2, | |
98 | LXCFS_OPTS_MAX = LXCFS_CFS_ON, | |
99 | } lxcfs_opt_t; | |
100 | ||
101 | ||
71f17cd2 | 102 | extern pid_t lookup_initpid_in_store(pid_t qpid); |
71f17cd2 | 103 | extern void prune_init_slice(char *cg); |
2aa59b2e | 104 | extern bool supports_pidfd(void); |
cbfc55fd | 105 | extern bool liblxcfs_functional(void); |
c6805016 | 106 | extern bool liblxcfs_can_use_swap(void); |
50f7faee | 107 | extern bool liblxcfs_memory_is_cgroupv2(void); |
285aea40 CB |
108 | extern bool liblxcfs_can_use_sys_cpu(void); |
109 | extern bool liblxcfs_has_versioned_opts(void); | |
71f17cd2 | 110 | |
84e184b1 CB |
111 | static inline bool lxcfs_has_opt(struct lxcfs_opts *opts, lxcfs_opt_t opt) |
112 | { | |
113 | if (!opts) | |
114 | return false; | |
115 | ||
116 | if (opt > LXCFS_OPTS_MAX) | |
117 | return false; | |
118 | ||
119 | switch (opt) { | |
120 | case LXCFS_SWAP_ON: | |
121 | if (!opts->swap_off) | |
122 | return liblxcfs_can_use_swap(); | |
123 | return false; | |
124 | case LXCFS_PIDFD_ON: | |
125 | return opts->use_pidfd; | |
126 | case LXCFS_CFS_ON: | |
127 | return opts->use_cfs; | |
128 | } | |
129 | ||
130 | return false; | |
131 | } | |
132 | ||
dee86006 CB |
133 | static inline int install_signal_handler(int signo, |
134 | void (*handler)(int, siginfo_t *, void *)) | |
135 | { | |
136 | struct sigaction action = { | |
137 | .sa_flags = SA_SIGINFO, | |
138 | .sa_sigaction = handler, | |
139 | }; | |
140 | ||
141 | return sigaction(signo, &action, NULL); | |
142 | } | |
143 | ||
1bdeec69 CB |
144 | extern pid_t lxcfs_raw_clone(unsigned long flags, int *pidfd); |
145 | ||
146 | static inline pid_t lxcfs_clone(int (*fn)(void *), void *arg, int flags) | |
147 | { | |
148 | pid_t pid; | |
149 | ||
150 | pid = lxcfs_raw_clone(flags, NULL); | |
151 | if (pid < 0) | |
152 | return -1; | |
153 | ||
154 | if (pid == 0) | |
155 | _exit(fn(arg)); | |
156 | ||
157 | return pid; | |
158 | } | |
6abff455 | 159 | |
0d5383b7 | 160 | __visible extern void *lxcfs_fuse_init(struct fuse_conn_info *conn, void *data); |
285aea40 | 161 | |
17e0e368 | 162 | #endif /* __LXCFS_BINDINGS_H */ |