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xattr-util: support AT_EMPTY_PATH in fgetxattrat_fake() 

Let's expose fstatat() like behaviour if AT_EMPTY_PATH is defined.

Also, check the specified flags returning EINVAL on the flags we don't
emulate.
This commit is contained in:
Lennart Poettering 2018-02-20 12:46:14 +01:00
parent 8fc58f1ad3
commit 1133dea477
1 changed files with 15 additions and 4 deletions
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19
src/basic/xattr-util.c
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@ -31,6 +31,7 @@
#include "macro.h"
#include "sparse-endian.h"
#include "stdio-util.h"
#include "string-util.h"
#include "time-util.h"
#include "xattr-util.h"
@ -111,11 +112,21 @@ ssize_t fgetxattrat_fake(int dirfd, const char *filename, const char *attribute,
/* The kernel doesn't have a fgetxattrat() command, hence let's emulate one */
fd = openat(dirfd, filename, O_CLOEXEC|O_PATH|(flags & AT_SYMLINK_NOFOLLOW ? O_NOFOLLOW : 0));
if (fd < 0)
return -errno;
if (flags & ~(AT_SYMLINK_NOFOLLOW|AT_EMPTY_PATH))
return -EINVAL;
xsprintf(fn, "/proc/self/fd/%i", fd);
if (isempty(filename)) {
if (!(flags & AT_EMPTY_PATH))
return -EINVAL;
xsprintf(fn, "/proc/self/fd/%i", dirfd);
} else {
fd = openat(dirfd, filename, O_CLOEXEC|O_PATH|(flags & AT_SYMLINK_NOFOLLOW ? O_NOFOLLOW : 0));
if (fd < 0)
return -errno;
xsprintf(fn, "/proc/self/fd/%i", fd);
}
l = getxattr(fn, attribute, value, size);
if (l < 0)