projects / thirdparty / systemd.git / blame
| Commit | Line | Data |
|---|---|---|
| 53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
| c8b3094d LP |
2 | /*** |
| 3 | This file is part of systemd. | |
| 4 | ||
| 5 | Copyright 2010 Lennart Poettering | |
| c8b3094d LP |
6 | ***/ |
| 7 | ||
| 11c3a366 TA |
8 | #include <errno.h> |
| 9 | #include <fcntl.h> | |
| c8b3094d LP |
10 | #include <sys/ioctl.h> |
| 11 | #include <sys/stat.h> | |
| 12 | #include <linux/fs.h> | |
| 13 | ||
| 14 | #include "chattr-util.h" | |
| 15 | #include "fd-util.h" | |
| 11c3a366 | 16 | #include "macro.h" |
| c8b3094d LP |
17 | |
| 18 | int chattr_fd(int fd, unsigned value, unsigned mask) { | |
| 19 | unsigned old_attr, new_attr; | |
| 20 | struct stat st; | |
| 21 | ||
| 22 | assert(fd >= 0); | |
| 23 | ||
| 24 | if (fstat(fd, &st) < 0) | |
| 25 | return -errno; | |
| 26 | ||
| 27 | /* Explicitly check whether this is a regular file or | |
| 28 | * directory. If it is anything else (such as a device node or | |
| 29 | * fifo), then the ioctl will not hit the file systems but | |
| 30 | * possibly drivers, where the ioctl might have different | |
| 31 | * effects. Notably, DRM is using the same ioctl() number. */ | |
| 32 | ||
| 33 | if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode)) | |
| 34 | return -ENOTTY; | |
| 35 | ||
| 36 | if (mask == 0) | |
| 37 | return 0; | |
| 38 | ||
| 39 | if (ioctl(fd, FS_IOC_GETFLAGS, &old_attr) < 0) | |
| 40 | return -errno; | |
| 41 | ||
| 42 | new_attr = (old_attr & ~mask) | (value & mask); | |
| 43 | if (new_attr == old_attr) | |
| 44 | return 0; | |
| 45 | ||
| 46 | if (ioctl(fd, FS_IOC_SETFLAGS, &new_attr) < 0) | |
| 47 | return -errno; | |
| 48 | ||
| 49 | return 1; | |
| 50 | } | |
| 51 | ||
| 52 | int chattr_path(const char *p, unsigned value, unsigned mask) { | |
| 53 | _cleanup_close_ int fd = -1; | |
| 54 | ||
| 55 | assert(p); | |
| 56 | ||
| 57 | if (mask == 0) | |
| 58 | return 0; | |
| 59 | ||
| 60 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
| 61 | if (fd < 0) | |
| 62 | return -errno; | |
| 63 | ||
| 64 | return chattr_fd(fd, value, mask); | |
| 65 | } | |
| 66 | ||
| 67 | int read_attr_fd(int fd, unsigned *ret) { | |
| 68 | struct stat st; | |
| 69 | ||
| 70 | assert(fd >= 0); | |
| 71 | ||
| 72 | if (fstat(fd, &st) < 0) | |
| 73 | return -errno; | |
| 74 | ||
| 75 | if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode)) | |
| 76 | return -ENOTTY; | |
| 77 | ||
| 78 | if (ioctl(fd, FS_IOC_GETFLAGS, ret) < 0) | |
| 79 | return -errno; | |
| 80 | ||
| 81 | return 0; | |
| 82 | } | |
| 83 | ||
| 84 | int read_attr_path(const char *p, unsigned *ret) { | |
| 85 | _cleanup_close_ int fd = -1; | |
| 86 | ||
| 87 | assert(p); | |
| 88 | assert(ret); | |
| 89 | ||
| 90 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
| 91 | if (fd < 0) | |
| 92 | return -errno; | |
| 93 | ||
| 94 | return read_attr_fd(fd, ret); | |
| 95 | } |