Created
November 21, 2012 12:24
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devprot - (un)set write protection flag in block devices
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| /* | |
| devprot - (un)set write protection flag in block devices | |
| Copyright (C) 2012 Fernando Mercês | |
| This program is free software: you can redistribute it and/or modify | |
| it under the terms of the GNU General Public License as published by | |
| the Free Software Foundation, either version 3 of the License, or | |
| (at your option) any later version. | |
| This program is distributed in the hope that it will be useful, | |
| but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| GNU General Public License for more details. | |
| You should have received a copy of the GNU General Public License | |
| along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| */ | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <fcntl.h> | |
| #include <sys/ioctl.h> | |
| #include <linux/fs.h> | |
| #include <unistd.h> | |
| void fatal(const char *msg) | |
| { | |
| fprintf(stderr, msg); | |
| exit(1); | |
| } | |
| void usage() | |
| { | |
| printf("Usage:\n\t" | |
| "devprot <device>\n" | |
| "Example:\n\t" | |
| "devprot /dev/sdc\n"); | |
| } | |
| int main(int argc, char *argv[]) | |
| { | |
| int fd, state; | |
| if (argc != 2) | |
| { | |
| usage(); | |
| exit(1); | |
| } | |
| // tenta abri-lo | |
| if ((fd = open(argv[1], O_RDONLY|O_NONBLOCK)) == -1) | |
| fatal("unable to open device\n"); | |
| // pega o estado atual | |
| if (ioctl(fd, BLKROGET, &state) == -1) | |
| fatal("error getting device status - are you ruth?\n"); | |
| // inverte a logica da coisa | |
| state = !state; | |
| // configura o novo estado | |
| if (ioctl(fd, BLKROSET, &state) == -1) | |
| fatal("error setting device status - are you ruth?\n"); | |
| printf("%s%sprotected!\n", argv[1], !state ? " un" : " "); | |
| close(fd); | |
| return 0; | |
| } |
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