b26fa1a2fb
This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.
108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <linux/fs.h>
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#include "chattr-util.h"
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#include "fd-util.h"
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#include "macro.h"
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int chattr_fd(int fd, unsigned value, unsigned mask) {
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unsigned old_attr, new_attr;
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struct stat st;
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assert(fd >= 0);
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if (fstat(fd, &st) < 0)
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return -errno;
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/* Explicitly check whether this is a regular file or
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* directory. If it is anything else (such as a device node or
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* fifo), then the ioctl will not hit the file systems but
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* possibly drivers, where the ioctl might have different
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* effects. Notably, DRM is using the same ioctl() number. */
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if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode))
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return -ENOTTY;
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if (mask == 0)
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return 0;
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if (ioctl(fd, FS_IOC_GETFLAGS, &old_attr) < 0)
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return -errno;
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new_attr = (old_attr & ~mask) | (value & mask);
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if (new_attr == old_attr)
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return 0;
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if (ioctl(fd, FS_IOC_SETFLAGS, &new_attr) < 0)
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return -errno;
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return 1;
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}
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int chattr_path(const char *p, unsigned value, unsigned mask) {
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_cleanup_close_ int fd = -1;
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assert(p);
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if (mask == 0)
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return 0;
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fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
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if (fd < 0)
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return -errno;
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return chattr_fd(fd, value, mask);
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}
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int read_attr_fd(int fd, unsigned *ret) {
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struct stat st;
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assert(fd >= 0);
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if (fstat(fd, &st) < 0)
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return -errno;
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if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode))
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return -ENOTTY;
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if (ioctl(fd, FS_IOC_GETFLAGS, ret) < 0)
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return -errno;
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return 0;
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}
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int read_attr_path(const char *p, unsigned *ret) {
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_cleanup_close_ int fd = -1;
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assert(p);
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assert(ret);
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fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
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if (fd < 0)
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return -errno;
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return read_attr_fd(fd, ret);
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}
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