101 lines
1.6 KiB
C
101 lines
1.6 KiB
C
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/* diskctl - control disk device driver parameters - by D.C. van Moolenbroek */
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <fcntl.h>
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static char *name, *dev;
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static void usage(void)
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{
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fprintf(stderr, "usage: %s <device> <command> [args]\n"
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"\n"
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"supported commands:\n"
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" getwcache return write cache status\n"
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" setwcache [on|off] set write cache status\n"
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" flush flush write cache\n",
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name);
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exit(EXIT_FAILURE);
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}
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static int open_dev(int flags)
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{
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int fd;
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fd = open(dev, flags);
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if (fd < 0) {
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perror("open");
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exit(EXIT_FAILURE);
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}
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return fd;
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}
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int main(int argc, char **argv)
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{
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int fd, val;
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name = argv[0];
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if (argc < 3) usage();
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dev = argv[1];
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if (!strcasecmp(argv[2], "getwcache")) {
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if (argc != 3) usage();
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fd = open_dev(O_RDONLY);
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if (ioctl(fd, DIOCGETWC, &val) != 0) {
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perror("ioctl");
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return EXIT_FAILURE;
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}
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close(fd);
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printf("write cache is %s\n", val ? "on" : "off");
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}
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else if (!strcasecmp(argv[2], "setwcache")) {
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if (argc != 4) usage();
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fd = open_dev(O_WRONLY);
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if (!strcasecmp(argv[3], "on")) val = 1;
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else if (!strcasecmp(argv[3], "off")) val = 0;
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else usage();
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if (ioctl(fd, DIOCSETWC, &val) != 0) {
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perror("ioctl");
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return EXIT_FAILURE;
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}
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close(fd);
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printf("write cache %sabled\n", val ? "en" : "dis");
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}
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else if (!strcasecmp(argv[2], "flush")) {
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if (argc != 3) usage();
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fd = open_dev(O_WRONLY);
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if (ioctl(fd, DIOCFLUSH, NULL) != 0) {
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perror("ioctl");
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return EXIT_FAILURE;
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}
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close(fd);
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printf("write cache flushed\n");
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}
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else usage();
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return EXIT_SUCCESS;
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}
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