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dirent-util: tweak readdir_ensure_type() a bit

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So far we ignored if readdir_ensure_type() failed, the .d_type would
then still possibly report DT_UNKNOWN, possibly confusing the caller.

Let's make this safer: if we get an error on readdir_ensure_type() then
report it — except if it is ENOENT which indicates the dirent vanished
by now, which is not a problem and we should just skip to the next
entry.
This commit is contained in:
Lennart Poettering 2021-10-07 22:58:43 +02:00
parent 3214129369
commit 49a0931f62
1 changed files with 30 additions and 14 deletions
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44
src/basic/dirent-util.c
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@ -66,24 +66,40 @@ bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) {
}
struct dirent *readdir_ensure_type(DIR *d) {
struct dirent *de;
int r;
assert(d);
errno = 0;
de = readdir(d);
if (de)
(void) dirent_ensure_type(d, de);
return de;
}
struct dirent *readdir_no_dot(DIR *dirp) {
struct dirent *d;
/* Like readdir(), but fills in .d_type if it is DT_UNKNOWN */
for (;;) {
d = readdir_ensure_type(dirp);
if (d && dot_or_dot_dot(d->d_name))
continue;
return d;
struct dirent *de;
errno = 0;
de = readdir(d);
if (!de)
return NULL;
r = dirent_ensure_type(d, de);
if (r >= 0)
return de;
if (r != -ENOENT) {
errno = -r; /* We want to be compatible with readdir(), hence propagate error via errno here */
return NULL;
}
/* Vanished by now? Then skip immedately to next */
}
}
struct dirent *readdir_no_dot(DIR *d) {
assert(d);
for (;;) {
struct dirent *de;
de = readdir_ensure_type(d);
if (!de || !dot_or_dot_dot(de->d_name))
return de;
}
}