+int get_process_cmdline(pid_t pid, size_t max_length, char **line) {
+ char *p, *r, *k;
+ int c;
+ bool space = false;
+ size_t left;
+ FILE *f;
+
+ assert(pid >= 1);
+ assert(max_length > 0);
+ assert(line);
+
+ if (asprintf(&p, "/proc/%lu/cmdline", (unsigned long) pid) < 0)
+ return -ENOMEM;
+
+ f = fopen(p, "r");
+ free(p);
+
+ if (!f)
+ return -errno;
+
+ if (!(r = new(char, max_length))) {
+ fclose(f);
+ return -ENOMEM;
+ }
+
+ k = r;
+ left = max_length;
+ while ((c = getc(f)) != EOF) {
+
+ if (isprint(c)) {
+ if (space) {
+ if (left <= 4)
+ break;
+
+ *(k++) = ' ';
+ space = false;
+ }
+
+ if (left <= 4)
+ break;
+
+ *(k++) = (char) c;
+ } else
+ space = true;
+ }
+
+ if (left <= 4) {
+ size_t n = MIN(left-1, 3U);
+ memcpy(k, "...", n);
+ k[n] = 0;
+ } else
+ *k = 0;
+
+ fclose(f);
+
+ *line = r;
+ return 0;
+}
+