11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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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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