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/*
* Copyright (c) 2011 Wind River Systems; see
* guts/COPYRIGHT for information.
*
* SPDX-License-Identifier: LGPL-2.1-only
*
* int mknodat(int dirfd, const char *path, mode_t mode, dev_t dev)
* int rc = -1;
*/
pseudo_msg_t *msg;
PSEUDO_STATBUF buf;
int save_errno = errno;
/* mask out mode bits appropriately */
mode = mode & ~pseudo_umask;
/* if you don't specify a type, assume regular file */
if (!(mode & S_IFMT)) {
mode |= S_IFREG;
}
pseudo_debug(PDBGF_FILE, "mknodat creating '%s', mode 0%o\n",
path ? path : "<no name>", (int) mode);
#ifdef PSEUDO_NO_REAL_AT_FUNCTIONS
if (dirfd != AT_FDCWD) {
errno = ENOSYS;
return -1;
}
rc = base_stat(path, &buf);
#else
rc = base_fstatat(dirfd, path, &buf, AT_SYMLINK_NOFOLLOW);
#endif
if (rc != -1) {
/* if we can stat the file, you can't mknod it */
errno = EEXIST;
return -1;
}
#ifdef PSEUDO_NO_REAL_AT_FUNCTIONS
rc = real_open(path, O_CREAT | O_WRONLY | O_EXCL,
PSEUDO_FS_MODE(mode, 0));
#else
rc = real_openat(dirfd, path, O_CREAT | O_WRONLY | O_EXCL,
PSEUDO_FS_MODE(mode, 0));
#endif
if (rc == -1) {
return -1;
}
real_fchmod(rc, PSEUDO_FS_MODE(mode, 0));
base_fstat(rc, &buf);
/* mknod does not really open the file. We don't have
* to use wrap_close because we've never exposed this file
* descriptor to the client code.
*/
real_close(rc);
/* mask in the mode type bits again */
buf.st_mode = (PSEUDO_DB_MODE(buf.st_mode, mode) & 07777) |
(mode & ~07777);
buf.st_rdev = dev;
msg = pseudo_client_op(OP_MKNOD, 0, -1, dirfd, path, &buf);
if (msg && msg->result != RESULT_SUCCEED) {
errno = EPERM;
rc = -1;
} else {
/* just pretend we worked */
errno = save_errno;
rc = 0;
}
if (rc == -1) {
save_errno = errno;
#ifdef PSEUDO_NO_REAL_AT_FUNCTIONS
real_unlink(path);
#else
real_unlinkat(dirfd, path, AT_SYMLINK_NOFOLLOW);
#endif
errno = save_errno;
}
/* return rc;
* }
*/
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