bindings: improve returned errnos

Signed-off-by: Christian Brauner <cbrauner@suse.de>

diff --git a/bindings.c b/bindings.c
index 8a5909acf19468a523c575de511ac2fd0cafb64b..aaba840a1862725b6e471968e25fb8ac88ea79b4 100644 (file)
--- a/bindings.c
+++ b/bindings.c
@@ -1541,12 +1541,17 @@ static const char *find_cgroup_in_path(const char *path)
 {
        const char *p1;
 
-       if (strlen(path) < 9)
+       if (strlen(path) < 9) {
+               errno = EINVAL;
                return NULL;
-       p1 = strstr(path+8, "/");
-       if (!p1)
+       }
+       p1 = strstr(path + 8, "/");
+       if (!p1) {
+               errno = EINVAL;
                return NULL;
-       return p1+1;
+       }
+       errno = 0;
+       return p1 + 1;
 }
 
 /*
@@ -1866,7 +1871,7 @@ int cg_open(const char *path, struct fuse_file_info *fi)
                return -errno;
        cgroup = find_cgroup_in_path(path);
        if (!cgroup)
-               return -EINVAL;
+               return -errno;
 
        get_cgdir_and_path(cgroup, &cgdir, &last);
        if (!last) {
@@ -2717,15 +2722,16 @@ int cg_chown(const char *path, uid_t uid, gid_t gid)
                return -EIO;
 
        if (strcmp(path, "/cgroup") == 0)
-               return -EINVAL;
+               return -EPERM;
 
        controller = pick_controller_from_path(fc, path);
        if (!controller)
-               return -errno;
+               return errno == ENOENT ? -EPERM : -errno;
+
        cgroup = find_cgroup_in_path(path);
        if (!cgroup)
                /* this is just /cgroup/controller */
-               return -EINVAL;
+               return -EPERM;
 
        get_cgdir_and_path(cgroup, &cgdir, &last);
 
@@ -2782,15 +2788,16 @@ int cg_chmod(const char *path, mode_t mode)
                return -EIO;
 
        if (strcmp(path, "/cgroup") == 0)
-               return -EINVAL;
+               return -EPERM;
 
        controller = pick_controller_from_path(fc, path);
        if (!controller)
-               return -errno;
+               return errno == ENOENT ? -EPERM : -errno;
+
        cgroup = find_cgroup_in_path(path);
        if (!cgroup)
                /* this is just /cgroup/controller */
-               return -EINVAL;
+               return -EPERM;
 
        get_cgdir_and_path(cgroup, &cgdir, &last);
 
@@ -2848,14 +2855,13 @@ int cg_mkdir(const char *path, mode_t mode)
        if (!fc)
                return -EIO;
 
-
        controller = pick_controller_from_path(fc, path);
        if (!controller)
                return errno == ENOENT ? -EPERM : -errno;
 
        cgroup = find_cgroup_in_path(path);
        if (!cgroup)
-               return -EINVAL;
+               return -errno;
 
        get_cgdir_and_path(cgroup, &cgdir, &last);
        if (!last)
@@ -2909,7 +2915,7 @@ int cg_rmdir(const char *path)
 
        cgroup = find_cgroup_in_path(path);
        if (!cgroup)
-               return -EINVAL;
+               return -errno;
 
        get_cgdir_and_path(cgroup, &cgdir, &last);
        if (!last) {