exec: allow passing arbitrary path names to blkio cgroup attributes

[elogind.git] / src / util.c

diff --git a/src/util.c b/src/util.c
index 6382c01c556eb7d7f0e83f1de62338909b248f78..017b99589735de53a459b9c06c30cc8c7b4e109e 100644 (file)
--- a/src/util.c
+++ b/src/util.c
@@ -73,7 +73,7 @@ size_t page_size(void) {
         static __thread size_t pgsz = 0;
         long r;
 
-        if (pgsz)
+        if (_likely_(pgsz))
                 return pgsz;
 
         assert_se((r = sysconf(_SC_PAGESIZE)) > 0);
@@ -1439,6 +1439,19 @@ char *delete_chars(char *s, const char *bad) {
         return s;
 }
 
+bool in_charset(const char *s, const char* charset) {
+        const char *i;
+
+        assert(s);
+        assert(charset);
+
+        for (i = s; *i; i++)
+                if (!strchr(charset, *i))
+                        return false;
+
+        return true;
+}
+
 char *file_in_same_dir(const char *path, const char *filename) {
         char *e, *r;
         size_t k;
@@ -2969,6 +2982,62 @@ int parse_usec(const char *t, usec_t *usec) {
         return 0;
 }
 
+int parse_bytes(const char *t, off_t *bytes) {
+        static const struct {
+                const char *suffix;
+                off_t factor;
+        } table[] = {
+                { "B", 1 },
+                { "K", 1024ULL },
+                { "M", 1024ULL*1024ULL },
+                { "G", 1024ULL*1024ULL*1024ULL },
+                { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
+                { "", 1 },
+        };
+
+        const char *p;
+        off_t r = 0;
+
+        assert(t);
+        assert(bytes);
+
+        p = t;
+        do {
+                long long l;
+                char *e;
+                unsigned i;
+
+                errno = 0;
+                l = strtoll(p, &e, 10);
+
+                if (errno != 0)
+                        return -errno;
+
+                if (l < 0)
+                        return -ERANGE;
+
+                if (e == p)
+                        return -EINVAL;
+
+                e += strspn(e, WHITESPACE);
+
+                for (i = 0; i < ELEMENTSOF(table); i++)
+                        if (startswith(e, table[i].suffix)) {
+                                r += (off_t) l * table[i].factor;
+                                p = e + strlen(table[i].suffix);
+                                break;
+                        }
+
+                if (i >= ELEMENTSOF(table))
+                        return -EINVAL;
+
+        } while (*p != 0);
+
+        *bytes = r;
+
+        return 0;
+}
+
 int make_stdio(int fd) {
         int r, s, t;
 
@@ -3768,7 +3837,7 @@ int columns(void) {
         static __thread int parsed_columns = 0;
         const char *e;
 
-        if (parsed_columns > 0)
+        if (_likely_(parsed_columns > 0))
                 return parsed_columns;
 
         if ((e = getenv("COLUMNS")))
@@ -4364,7 +4433,7 @@ int detect_virtualization(const char **id) {
         const char *_id;
         int r;
 
-        if (cached_id) {
+        if (_likely_(cached_id)) {
 
                 if (cached_id == (const char*) -1)
                         return 0;
@@ -5536,6 +5605,76 @@ char *join(const char *x, ...) {
         return r;
 }
 
+bool is_main_thread(void) {
+        static __thread int cached = 0;
+
+        if (_unlikely_(cached == 0))
+                cached = getpid() == gettid() ? 1 : -1;
+
+        return cached > 0;
+}
+
+int block_get_whole_disk(dev_t d, dev_t *ret) {
+        char *p, *s;
+        int r;
+        unsigned n, m;
+
+        assert(ret);
+
+        /* If it has a queue this is good enough for us */
+        if (asprintf(&p, "/sys/dev/block/%u:%u/queue", major(d), minor(d)) < 0)
+                return -ENOMEM;
+
+        r = access(p, F_OK);
+        free(p);
+
+        if (r >= 0) {
+                *ret = d;
+                return 0;
+        }
+
+        /* If it is a partition find the originating device */
+        if (asprintf(&p, "/sys/dev/block/%u:%u/partition", major(d), minor(d)) < 0)
+                return -ENOMEM;
+
+        r = access(p, F_OK);
+        free(p);
+
+        if (r < 0)
+                return -ENOENT;
+
+        /* Get parent dev_t */
+        if (asprintf(&p, "/sys/dev/block/%u:%u/../dev", major(d), minor(d)) < 0)
+                return -ENOMEM;
+
+        r = read_one_line_file(p, &s);
+        free(p);
+
+        if (r < 0)
+                return r;
+
+        r = sscanf(s, "%u:%u", &m, &n);
+        free(s);
+
+        if (r != 2)
+                return -EINVAL;
+
+        /* Only return this if it is really good enough for us. */
+        if (asprintf(&p, "/sys/dev/block/%u:%u/queue", m, n) < 0)
+                return -ENOMEM;
+
+        r = access(p, F_OK);
+        free(p);
+
+        if (r >= 0) {
+                *ret = makedev(m, n);
+                return 0;
+        }
+
+        return -ENOENT;
+}
+
+
 static const char *const ioprio_class_table[] = {
         [IOPRIO_CLASS_NONE] = "none",
         [IOPRIO_CLASS_RT] = "realtime",