meminfo: Add process command line to the output

userspace/meminfo/main.cpp

@@ -30,6 +30,43 @@ int main()
 		if (!is_only_digits(proc_ent->d_name))
 			continue;
 
+		printf("process: ");
+
+		{
+			strcpy(path_buffer, proc_ent->d_name);
+			strcat(path_buffer, "/cmdline");
+
+			int fd = openat(dirfd(proc), path_buffer, O_RDONLY);
+			if (fd == -1)
+			{
+				perror("openat");
+				continue;
+			}
+
+			while (ssize_t nread = read(fd, path_buffer, sizeof(path_buffer) - 1))
+			{
+				if (nread == -1)
+				{
+					perror("read");
+					break;
+				}
+				for (int i = 0; i < nread; i++)
+					if (path_buffer[i] == '\0')
+						path_buffer[i] = ' ';
+
+				path_buffer[nread] = '\0';
+
+				int written = 0;
+				while (written < nread)
+					written += printf("%s ", path_buffer + written);
+			}
+
+			close(fd);
+		}
+
+		printf("\n  pid:  %s\n", proc_ent->d_name);
+
+		{
 			strcpy(path_buffer, proc_ent->d_name);
 			strcat(path_buffer, "/meminfo");
 		
@@ -45,14 +82,13 @@ int main()
 				perror("read");
 			else
 			{
-			printf("process:\n");
-			printf("  pid:  %s\n", proc_ent->d_name);
 				printf("  vmem: %zu pages (%zu bytes)\n", meminfo.virt_pages, meminfo.page_size * meminfo.virt_pages);
 				printf("  pmem: %zu pages (%zu bytes)\n", meminfo.phys_pages, meminfo.page_size * meminfo.phys_pages);
 			}
 
 			close(fd);
 		}
+	}
 
 	closedir(proc);
 }