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authorLennart Poettering <lennart@poettering.net>2010-07-12 18:16:44 +0200
committerLennart Poettering <lennart@poettering.net>2010-07-12 18:16:44 +0200
commit35d2e7ec19f8d3960a14dc04642060ccee3faa43 (patch)
treeec7b2c683f18f477a1dbc9af98b29273de17149e /src/util.c
parentdbd821acb4d91181b309860bb4d4b711b38da7b4 (diff)
cgroup: reimplement the last bit of libcgroup functionality natively
Diffstat (limited to 'src/util.c')
-rw-r--r--src/util.c77
1 files changed, 66 insertions, 11 deletions
diff --git a/src/util.c b/src/util.c
index 69eb14be61..fa34137bdc 100644
--- a/src/util.c
+++ b/src/util.c
@@ -609,8 +609,22 @@ int get_process_cmdline(pid_t pid, size_t max_length, char **line) {
fclose(f);
- if (r[0] == 0)
- return get_process_name(pid, line);
+ /* Kernel threads have no argv[] */
+ if (r[0] == 0) {
+ char *t;
+ int h;
+
+ free(r);
+
+ if ((h = get_process_name(pid, &t)) < 0)
+ return h;
+
+ h = asprintf(&r, "[%s]", t);
+ free(t);
+
+ if (h < 0)
+ return -ENOMEM;
+ }
*line = r;
return 0;
@@ -698,6 +712,48 @@ int readlink_and_make_absolute(const char *p, char **r) {
return 0;
}
+int parent_of_path(const char *path, char **_r) {
+ const char *e, *a = NULL, *b = NULL, *p;
+ char *r;
+ bool slash = false;
+
+ assert(path);
+ assert(_r);
+
+ if (!*path)
+ return -EINVAL;
+
+ for (e = path; *e; e++) {
+
+ if (!slash && *e == '/') {
+ a = b;
+ b = e;
+ slash = true;
+ } else if (slash && *e != '/')
+ slash = false;
+ }
+
+ if (*(e-1) == '/')
+ p = a;
+ else
+ p = b;
+
+ if (!p)
+ return -EINVAL;
+
+ if (p == path)
+ r = strdup("/");
+ else
+ r = strndup(path, p-path);
+
+ if (!r)
+ return -ENOMEM;
+
+ *_r = r;
+ return 0;
+}
+
+
char *file_name_from_path(const char *p) {
char *r;
@@ -2201,25 +2257,24 @@ ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) {
int path_is_mount_point(const char *t) {
struct stat a, b;
- char *copy;
+ char *parent;
+ int r;
if (lstat(t, &a) < 0) {
-
if (errno == ENOENT)
return 0;
return -errno;
}
- if (!(copy = strdup(t)))
- return -ENOMEM;
+ if ((r = parent_of_path(t, &parent)) < 0)
+ return r;
- if (lstat(dirname(copy), &b) < 0) {
- free(copy);
- return -errno;
- }
+ r = lstat(parent, &b);
+ free(parent);
- free(copy);
+ if (r < 0)
+ return -errno;
return a.st_dev != b.st_dev;
}