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