/* 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 (__glibc_unlikely (filelen == 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)