0c69794138
These lines are generally out-of-date, incomplete and unnecessary. With SPDX and git repository much more accurate and fine grained information about licensing and authorship is available, hence let's drop the per-file copyright notice. Of course, removing copyright lines of others is problematic, hence this commit only removes my own lines and leaves all others untouched. It might be nicer if sooner or later those could go away too, making git the only and accurate source of authorship information.
91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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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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