| /* Copyright (C) 2005-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/sysmacros.h> |
| |
| #include <sysdep.h> |
| #include <kernel-features.h> |
| #include <sys/syscall.h> |
| |
| |
| /* Create a device file named PATH relative to FD, with permission and |
| special bits MODE and device number DEV (which can be constructed |
| from major and minor device numbers with the `makedev' macro above). */ |
| int |
| __xmknodat (int vers, int fd, const char *file, mode_t mode, dev_t *dev) |
| { |
| if (vers != _MKNOD_VER) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| |
| /* We must convert the value to dev_t type used by the kernel. */ |
| unsigned long long int k_dev = (*dev) & ((1ULL << 32) - 1); |
| if (k_dev != *dev) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| |
| #ifdef __NR_mknodat |
| # ifndef __ASSUME_ATFCTS |
| if (__have_atfcts >= 0) |
| # endif |
| { |
| int res = INLINE_SYSCALL (mknodat, 4, fd, file, mode, |
| (unsigned int) k_dev); |
| # ifndef __ASSUME_ATFCTS |
| if (res == -1 && errno == ENOSYS) |
| __have_atfcts = -1; |
| else |
| # endif |
| return res; |
| } |
| #endif |
| |
| #ifndef __ASSUME_ATFCTS |
| char *buf = NULL; |
| |
| if (fd != AT_FDCWD && file[0] != '/') |
| { |
| size_t filelen = strlen (file); |
| if (__builtin_expect (filelen == 0, 0)) |
| { |
| __set_errno (ENOENT); |
| return -1; |
| } |
| |
| static const char procfd[] = "/proc/self/fd/%d/%s"; |
| /* Buffer for the path name we are going to use. It consists of |
| - the string /proc/self/fd/ |
| - the file descriptor number |
| - the file name provided. |
| The final NUL is included in the sizeof. A bit of overhead |
| due to the format elements compensates for possible negative |
| numbers. */ |
| size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen; |
| buf = alloca (buflen); |
| |
| __snprintf (buf, buflen, procfd, fd, file); |
| file = buf; |
| } |
| |
| return INLINE_SYSCALL (mknod, 3, file, mode, (unsigned int) k_dev); |
| #endif |
| } |
| |
| libc_hidden_def (__xmknodat) |