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sysfs: Allow file symlinks

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To test behavior on read error the test file can be linked to something
like /proc/self/mem that does not support read() but currently all
symlinks are skipped. Use fstatat instead of the directory entry type to
determine file type.
This commit is contained in:
Michal Suchanek
2026-05-06 14:19:44 +00:00
committed by Michal Suchánek
parent 66c2951a47
commit 639e040445
1 changed files with 16 additions and 4 deletions
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lib/sysfs.c
+16 -4
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@@ -570,13 +570,25 @@ static int sensors_read_dynamic_chip(sensors_chip_features *chip,
while ((ent = readdir(dir))) { while ((ent = readdir(dir))) {
char *name; char *name;
int nr; int nr, type;
struct stat st;
/* Skip directories and symlinks */ /* Skip directories and special files */
if (ent->d_type != DT_REG) if (ent->d_type == DT_DIR)
continue; continue;
name = ent->d_name; name = ent->d_name;
if (fstatat(dirfd(dir), name, &st, 0)) {
fprintf(stderr, "%s/%s: %s.\n", dev_path, name, sensors_strerror(errno));
continue;
}
type = (st.st_mode & S_IFMT);
switch (type) {
case S_IFREG: break;
default:
fprintf(stderr, "%s/%s: Not a regular file.\n", dev_path, name);
/* fallthrough */
case S_IFDIR: continue;
}
sftype = sensors_subfeature_get_type(name, &nr); sftype = sensors_subfeature_get_type(name, &nr);
if (sftype == SENSORS_SUBFEATURE_UNKNOWN) if (sftype == SENSORS_SUBFEATURE_UNKNOWN)