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stat: fit AT_EMPTY_PATH

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Matheus
2026-06-28 11:45:17 -03:00
parent 13ccd19c1f
commit 85e12f7e7b
1 changed files with 35 additions and 20 deletions
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kernel-src/sys/syscalls/stat.c
+35 -20
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@@ -65,32 +65,46 @@ syscallret_t syscall_fstatat(context_t *ctx, int dirfd, char *upath, stat_t *ust
if (ret.errno) if (ret.errno)
return ret; return ret;
char *path = alloc(pathlen + 1);
if (path == NULL) {
ret.errno = ENOMEM;
return ret;
}
ret.errno = usercopy_fromuser(path, upath, pathlen);
if (ret.errno) {
free(path);
return ret;
}
vnode_t *node = NULL; vnode_t *node = NULL;
vnode_t *dirnode = NULL; vnode_t *dirnode = NULL;
file_t *file = NULL; file_t *file = NULL;
ret.errno = dirfd_enter(path, dirfd, &file, &dirnode); char *path = NULL;
if (ret.errno) if (pathlen == 0 && (flags & AT_EMPTY_PATH)) {
goto cleanup; file = fd_get(dirfd);
if (file == NULL) {
ret.errno = EBADF;
goto cleanup;
}
ret.errno = vfs_lookup(&node, dirnode, path, NULL, flags & AT_SYMLINK_NOFOLLOW ? VFS_LOOKUP_NOLINK : 0); node = file->vnode;
if (ret.errno) VOP_HOLD(node);
goto cleanup; fd_release(file);
VOP_LOCK(node);
file = NULL;
} else {
path = alloc(pathlen + 1);
if (path == NULL) {
ret.errno = ENOMEM;
return ret;
}
ret.errno = usercopy_fromuser(path, upath, pathlen);
if (ret.errno) {
free(path);
return ret;
}
ret.errno = dirfd_enter(path, dirfd, &file, &dirnode);
if (ret.errno)
goto cleanup;
ret.errno = vfs_lookup(&node, dirnode, path, NULL, flags & AT_SYMLINK_NOFOLLOW ? VFS_LOOKUP_NOLINK : 0);
if (ret.errno)
goto cleanup;
}
stat_t buf; stat_t buf;
ret.errno = dostat(node, &buf); ret.errno = dostat(node, &buf);
// locked by vfs_lookup
VOP_UNLOCK(node); VOP_UNLOCK(node);
if (ret.errno) if (ret.errno)
goto cleanup; goto cleanup;
@@ -105,7 +119,8 @@ syscallret_t syscall_fstatat(context_t *ctx, int dirfd, char *upath, stat_t *ust
if (dirnode) if (dirnode)
dirfd_leave(dirnode, file); dirfd_leave(dirnode, file);
free(path); if (path)
free(path);
return ret; return ret;
} }