^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <limits.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <stdbool.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <sys/vfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <sys/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "debug-internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define _STR(x) #x
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define STR(x) _STR(x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #ifndef SYSFS_MAGIC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define SYSFS_MAGIC 0x62656572
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #ifndef PROC_SUPER_MAGIC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define PROC_SUPER_MAGIC 0x9fa0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #ifndef DEBUGFS_MAGIC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define DEBUGFS_MAGIC 0x64626720
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #ifndef TRACEFS_MAGIC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define TRACEFS_MAGIC 0x74726163
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #ifndef HUGETLBFS_MAGIC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define HUGETLBFS_MAGIC 0x958458f6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #ifndef BPF_FS_MAGIC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define BPF_FS_MAGIC 0xcafe4a11
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static const char * const sysfs__fs_known_mountpoints[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) "/sys",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static const char * const procfs__known_mountpoints[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) "/proc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #ifndef DEBUGFS_DEFAULT_PATH
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #define DEBUGFS_DEFAULT_PATH "/sys/kernel/debug"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static const char * const debugfs__known_mountpoints[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) DEBUGFS_DEFAULT_PATH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) "/debug",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #ifndef TRACEFS_DEFAULT_PATH
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #define TRACEFS_DEFAULT_PATH "/sys/kernel/tracing"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static const char * const tracefs__known_mountpoints[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) TRACEFS_DEFAULT_PATH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) "/sys/kernel/debug/tracing",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) "/tracing",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) "/trace",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static const char * const hugetlbfs__known_mountpoints[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static const char * const bpf_fs__known_mountpoints[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) "/sys/fs/bpf",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct fs {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) const char * const *mounts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) char path[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) bool found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) bool checked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) long magic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) FS__SYSFS = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) FS__PROCFS = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) FS__DEBUGFS = 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) FS__TRACEFS = 3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) FS__HUGETLBFS = 4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) FS__BPF_FS = 5,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) #ifndef TRACEFS_MAGIC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) #define TRACEFS_MAGIC 0x74726163
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static struct fs fs__entries[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) [FS__SYSFS] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) .name = "sysfs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) .mounts = sysfs__fs_known_mountpoints,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) .magic = SYSFS_MAGIC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) .checked = false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) [FS__PROCFS] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) .name = "proc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) .mounts = procfs__known_mountpoints,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) .magic = PROC_SUPER_MAGIC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) .checked = false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) [FS__DEBUGFS] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) .name = "debugfs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) .mounts = debugfs__known_mountpoints,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) .magic = DEBUGFS_MAGIC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) .checked = false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) [FS__TRACEFS] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) .name = "tracefs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) .mounts = tracefs__known_mountpoints,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) .magic = TRACEFS_MAGIC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) .checked = false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) [FS__HUGETLBFS] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) .name = "hugetlbfs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) .mounts = hugetlbfs__known_mountpoints,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) .magic = HUGETLBFS_MAGIC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .checked = false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) [FS__BPF_FS] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) .name = "bpf",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) .mounts = bpf_fs__known_mountpoints,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) .magic = BPF_FS_MAGIC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) .checked = false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) static bool fs__read_mounts(struct fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) bool found = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) char type[100];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) FILE *fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) fp = fopen("/proc/mounts", "r");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (fp == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) while (!found &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) fs->path, type) == 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (strcmp(type, fs->name) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) found = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) fclose(fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) fs->checked = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return fs->found = found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) static int fs__valid_mount(const char *fs, long magic)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) struct statfs st_fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (statfs(fs, &st_fs) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) else if ((long)st_fs.f_type != magic)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) static bool fs__check_mounts(struct fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) const char * const *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) ptr = fs->mounts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) while (*ptr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) if (fs__valid_mount(*ptr, fs->magic) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) fs->found = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) strcpy(fs->path, *ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) ptr++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) static void mem_toupper(char *f, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) while (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) *f = toupper(*f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) f++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * Check for "NAME_PATH" environment variable to override fs location (for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) * testing). This matches the recommendation in Documentation/admin-guide/sysfs-rules.rst
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * for SYSFS_PATH.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static bool fs__env_override(struct fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) char *override_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) size_t name_len = strlen(fs->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) /* name + "_PATH" + '\0' */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) char upper_name[name_len + 5 + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) memcpy(upper_name, fs->name, name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) mem_toupper(upper_name, name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) strcpy(&upper_name[name_len], "_PATH");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) override_path = getenv(upper_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (!override_path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) fs->found = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) fs->checked = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) strncpy(fs->path, override_path, sizeof(fs->path) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) fs->path[sizeof(fs->path) - 1] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) static const char *fs__get_mountpoint(struct fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) if (fs__env_override(fs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) return fs->path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) if (fs__check_mounts(fs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) return fs->path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (fs__read_mounts(fs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return fs->path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static const char *fs__mountpoint(int idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) struct fs *fs = &fs__entries[idx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (fs->found)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return (const char *)fs->path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) /* the mount point was already checked for the mount point
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) * but and did not exist, so return NULL to avoid scanning again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * This makes the found and not found paths cost equivalent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * in case of multiple calls.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (fs->checked)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) return fs__get_mountpoint(fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) static const char *mount_overload(struct fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) size_t name_len = strlen(fs->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) /* "PERF_" + name + "_ENVIRONMENT" + '\0' */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) char upper_name[5 + name_len + 12 + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) snprintf(upper_name, name_len, "PERF_%s_ENVIRONMENT", fs->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) mem_toupper(upper_name, name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return getenv(upper_name) ?: *fs->mounts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) static const char *fs__mount(int idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) struct fs *fs = &fs__entries[idx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) const char *mountpoint;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) if (fs__mountpoint(idx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) return (const char *)fs->path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) mountpoint = mount_overload(fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (mount(NULL, mountpoint, fs->name, 0, NULL) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return fs__check_mounts(fs) ? fs->path : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) #define FS(name, idx) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) const char *name##__mountpoint(void) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) return fs__mountpoint(idx); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) const char *name##__mount(void) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) return fs__mount(idx); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) bool name##__configured(void) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) return name##__mountpoint() != NULL; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) FS(sysfs, FS__SYSFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) FS(procfs, FS__PROCFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) FS(debugfs, FS__DEBUGFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) FS(tracefs, FS__TRACEFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) FS(hugetlbfs, FS__HUGETLBFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) FS(bpf_fs, FS__BPF_FS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) int filename__read_int(const char *filename, int *value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) char line[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) int fd = open(filename, O_RDONLY), err = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) if (fd < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) if (read(fd, line, sizeof(line)) > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) *value = atoi(line);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) static int filename__read_ull_base(const char *filename,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) unsigned long long *value, int base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) char line[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) int fd = open(filename, O_RDONLY), err = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (fd < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) if (read(fd, line, sizeof(line)) > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) *value = strtoull(line, NULL, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) if (*value != ULLONG_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * Parses @value out of @filename with strtoull.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) * By using 16 for base to treat the number as hex.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) int filename__read_xll(const char *filename, unsigned long long *value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) return filename__read_ull_base(filename, value, 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) * Parses @value out of @filename with strtoull.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) * By using 0 for base, the strtoull detects the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) * base automatically (see man strtoull).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) int filename__read_ull(const char *filename, unsigned long long *value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) return filename__read_ull_base(filename, value, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) #define STRERR_BUFSIZE 128 /* For the buffer size of strerror_r */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) int filename__read_str(const char *filename, char **buf, size_t *sizep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) size_t size = 0, alloc_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) void *bf = NULL, *nbf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) int fd, n, err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) char sbuf[STRERR_BUFSIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) fd = open(filename, O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) if (fd < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) return -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (size == alloc_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) alloc_size += BUFSIZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) nbf = realloc(bf, alloc_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (!nbf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) bf = nbf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) n = read(fd, bf + size, alloc_size - size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) if (n < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) if (size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) pr_warn("read failed %d: %s\n", errno,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) strerror_r(errno, sbuf, sizeof(sbuf)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) err = -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) size += n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) } while (n > 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) *sizep = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) *buf = bf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) free(bf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) int filename__write_int(const char *filename, int value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) int fd = open(filename, O_WRONLY), err = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) char buf[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) if (fd < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) sprintf(buf, "%d", value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) if (write(fd, buf, sizeof(buf)) == sizeof(buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) int procfs__read_str(const char *entry, char **buf, size_t *sizep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) char path[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) const char *procfs = procfs__mountpoint();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) if (!procfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) snprintf(path, sizeof(path), "%s/%s", procfs, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) return filename__read_str(path, buf, sizep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) static int sysfs__read_ull_base(const char *entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) unsigned long long *value, int base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) char path[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) const char *sysfs = sysfs__mountpoint();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) if (!sysfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) snprintf(path, sizeof(path), "%s/%s", sysfs, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) return filename__read_ull_base(path, value, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) int sysfs__read_xll(const char *entry, unsigned long long *value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return sysfs__read_ull_base(entry, value, 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) int sysfs__read_ull(const char *entry, unsigned long long *value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) return sysfs__read_ull_base(entry, value, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) int sysfs__read_int(const char *entry, int *value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) char path[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) const char *sysfs = sysfs__mountpoint();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if (!sysfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) snprintf(path, sizeof(path), "%s/%s", sysfs, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) return filename__read_int(path, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) int sysfs__read_str(const char *entry, char **buf, size_t *sizep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) char path[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) const char *sysfs = sysfs__mountpoint();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if (!sysfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) snprintf(path, sizeof(path), "%s/%s", sysfs, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) return filename__read_str(path, buf, sizep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) int sysfs__read_bool(const char *entry, bool *value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) char *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) size_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) ret = sysfs__read_str(entry, &buf, &size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) switch (buf[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) case '1':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) case 'y':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) case 'Y':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) *value = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) case '0':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) case 'n':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) case 'N':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) *value = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) ret = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) free(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) int sysctl__read_int(const char *sysctl, int *value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) char path[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) const char *procfs = procfs__mountpoint();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) if (!procfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) snprintf(path, sizeof(path), "%s/sys/%s", procfs, sysctl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) return filename__read_int(path, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) int sysfs__write_int(const char *entry, int value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) char path[PATH_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) const char *sysfs = sysfs__mountpoint();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) if (!sysfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) if (snprintf(path, sizeof(path), "%s/%s", sysfs, entry) >= PATH_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) return filename__write_int(path, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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