1 /* TODO merge/factor in debugfs.c here */
10 #include <sys/types.h>
18 static const char * const sysfs__fs_known_mountpoints[] = {
23 static const char * const procfs__known_mountpoints[] = {
30 const char * const *mounts;
31 char path[PATH_MAX + 1];
41 static struct fs fs__entries[] = {
44 .mounts = sysfs__fs_known_mountpoints,
49 .mounts = procfs__known_mountpoints,
50 .magic = PROC_SUPER_MAGIC,
54 static bool fs__read_mounts(struct fs *fs)
60 fp = fopen("/proc/mounts", "r");
65 fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
66 fs->path, type) == 2) {
68 if (strcmp(type, fs->name) == 0)
73 return fs->found = found;
76 static int fs__valid_mount(const char *fs, long magic)
80 if (statfs(fs, &st_fs) < 0)
82 else if ((long)st_fs.f_type != magic)
88 static bool fs__check_mounts(struct fs *fs)
90 const char * const *ptr;
94 if (fs__valid_mount(*ptr, fs->magic) == 0) {
96 strcpy(fs->path, *ptr);
105 static void mem_toupper(char *f, size_t len)
115 * Check for "NAME_PATH" environment variable to override fs location (for
116 * testing). This matches the recommendation in Documentation/sysfs-rules.txt
119 static bool fs__env_override(struct fs *fs)
122 size_t name_len = strlen(fs->name);
123 /* name + "_PATH" + '\0' */
124 char upper_name[name_len + 5 + 1];
125 memcpy(upper_name, fs->name, name_len);
126 mem_toupper(upper_name, name_len);
127 strcpy(&upper_name[name_len], "_PATH");
129 override_path = getenv(upper_name);
134 strncpy(fs->path, override_path, sizeof(fs->path));
138 static const char *fs__get_mountpoint(struct fs *fs)
140 if (fs__env_override(fs))
143 if (fs__check_mounts(fs))
146 if (fs__read_mounts(fs))
152 static const char *fs__mountpoint(int idx)
154 struct fs *fs = &fs__entries[idx];
157 return (const char *)fs->path;
159 return fs__get_mountpoint(fs);
162 #define FS__MOUNTPOINT(name, idx) \
163 const char *name##__mountpoint(void) \
165 return fs__mountpoint(idx); \
168 FS__MOUNTPOINT(sysfs, FS__SYSFS);
169 FS__MOUNTPOINT(procfs, FS__PROCFS);
171 int filename__read_int(const char *filename, int *value)
174 int fd = open(filename, O_RDONLY), err = -1;
179 if (read(fd, line, sizeof(line)) > 0) {
188 int sysctl__read_int(const char *sysctl, int *value)
191 const char *procfs = procfs__mountpoint();
196 snprintf(path, sizeof(path), "%s/sys/%s", procfs, sysctl);
198 return filename__read_int(path, value);