c175cce5e6
- move from minix/commands to minix/usr.sbin; - install into /usr/sbin instead of /usr/bin; - move manual page into source directory; - resolve compilation warning; - convert to KNF. Change-Id: Iccb4a8b27ae220254bae19e9198478b40706f542
106 lines
1.7 KiB
C
106 lines
1.7 KiB
C
/* 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 <string.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 void __dead
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usage(void)
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{
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fprintf(stderr,
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"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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getprogname());
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exit(EXIT_FAILURE);
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}
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static int
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open_dev(const char * 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
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main(int argc, char ** argv)
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{
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int fd, val;
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setprogname(argv[0]);
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if (argc < 3) usage();
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if (!strcasecmp(argv[2], "getwcache")) {
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if (argc != 3) usage();
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fd = open_dev(argv[1], 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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} else if (!strcasecmp(argv[2], "setwcache")) {
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if (argc != 4) usage();
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if (!strcasecmp(argv[3], "on"))
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val = 1;
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else if (!strcasecmp(argv[3], "off"))
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val = 0;
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else
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usage();
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fd = open_dev(argv[1], O_WRONLY);
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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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} else if (!strcasecmp(argv[2], "flush")) {
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if (argc != 3) usage();
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fd = open_dev(argv[1], 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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} else
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usage();
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return EXIT_SUCCESS;
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}
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