/* vi: set sw=4 ts=4: */ /* * freeramdisk and fdflush implementations for busybox * * Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it> * Adjusted a bit by Erik Andersen <andersen@codepoet.org> * Unified with fdflush by Tito Ragusa <farmatito@tiscali.it> * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ #include <stdio.h> #include <string.h> #include <sys/types.h> #include <fcntl.h> #include <sys/ioctl.h> #include <stdlib.h> #include <unistd.h> #include "busybox.h" /* From linux/fs.h */ #define BLKFLSBUF _IO(0x12,97) /* From <linux/fd.h> */ #define FDFLUSH _IO(2,0x4b) int freeramdisk_main(int argc, char **argv) { int result; int fd; if (argc != 2) bb_show_usage(); fd = bb_xopen(argv[1], O_RDWR); // Act like freeramdisk, fdflush, or both depending on configuration. result = ioctl(fd, (ENABLE_FREERAMDISK && bb_applet_name[1]=='r') || !ENABLE_FDFLUSH ? BLKFLSBUF : FDFLUSH); if (ENABLE_FEATURE_CLEAN_UP) close(fd); if (result) bb_perror_msg_and_die("%s", argv[1]); return EXIT_SUCCESS; }