diff options
Diffstat (limited to 'guts/fchmodat.c')
-rw-r--r-- | guts/fchmodat.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/guts/fchmodat.c b/guts/fchmodat.c new file mode 100644 index 0000000..36bd4d1 --- /dev/null +++ b/guts/fchmodat.c @@ -0,0 +1,70 @@ +/* + * static int + * wrap_fchmodat(int dirfd, const char *path, mode_t mode, int flags) { + * int rc = -1; + */ + pseudo_msg_t *msg; + struct stat64 buf; + int save_errno; + +#ifdef PSEUDO_NO_REAL_AT_FUNCTIONS + if (dirfd != AT_FDCWD) { + errno = ENOSYS; + return -1; + } + if (flags & AT_SYMLINK_NOFOLLOW) { + rc = real___lxstat64(_STAT_VER, path, &buf); + } else { + rc = real___xstat64(_STAT_VER, path, &buf); + } +#else + rc = real___fxstatat64(_STAT_VER, dirfd, path, &buf, flags); +#endif + if (rc == -1) { + return rc; + } + if (S_ISLNK(buf.st_mode)) { + /* we don't really support chmod of a symlink */ + errno = ENOSYS; + return -1; + } + save_errno = errno; + + /* purely for debugging purposes: check whether file + * is already in database. + */ + msg = pseudo_client_op(OP_STAT, flags, -1, -1, path, &buf); + if (!msg || msg->result != RESULT_SUCCEED) { + pseudo_debug(2, "chmodat to 0%o on %d/%s, ino %llu, new file.\n", + mode, dirfd, path, (unsigned long long) buf.st_ino); + + } + + /* user bits added so "root" can always access files. */ +#ifdef PSEUDO_NO_REAL_AT_FUNCTIONS + /* note: if path was a symlink, and AT_NOFOLLOW_SYMLINKS was + * specified, we already bailed previously. */ + real_chmod(path, PSEUDO_FS_MODE(mode)); +#else + real_fchmodat(dirfd, path, PSEUDO_FS_MODE(mode), flags); +#endif + /* we ignore a failure from underlying fchmod, because pseudo + * may believe you are permitted to change modes that the filesystem + * doesn't. + */ + + buf.st_mode = (buf.st_mode & ~07777) | (mode & 07777); + msg = pseudo_client_op(OP_CHMOD, flags, -1, dirfd, path, &buf); + if (!msg) { + errno = ENOSYS; + rc = -1; + } else if (msg->result != RESULT_SUCCEED) { + errno = msg->xerrno; + rc = -1; + } else { + rc = 0; + } + +/* return rc; + * } + */ |