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76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
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/* Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/sysmacros.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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#include <bp-checks.h>
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/* Create a device file named PATH relative to FD, with permission and
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special bits MODE and device number DEV (which can be constructed
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from major and minor device numbers with the `makedev' macro above). */
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int
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__xmknodat (int vers, int fd, const char *file, mode_t mode, dev_t *dev)
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{
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if (vers != _MKNOD_VER)
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{
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__set_errno (EINVAL);
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return -1;
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}
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char *buf = NULL;
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if (fd != AT_FDCWD && file[0] != '/')
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{
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size_t filelen = strlen (file);
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static const char procfd[] = "/proc/self/fd/%d/%s";
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/* Buffer for the path name we are going to use. It consists of
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- the string /proc/self/fd/
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- the file descriptor number
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- the file name provided.
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The final NUL is included in the sizeof. A bit of overhead
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due to the format elements compensates for possible negative
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numbers. */
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size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen;
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buf = alloca (buflen);
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__snprintf (buf, buflen, procfd, fd, file);
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file = buf;
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}
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/* We must convert the value to dev_t type used by the kernel. */
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unsigned long long int k_dev = (*dev) & ((1ULL << 32) - 1);
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if (k_dev != *dev)
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{
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__set_errno (EINVAL);
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return -1;
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}
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return INLINE_SYSCALL (mknod, 3, CHECK_STRING (file), mode,
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(unsigned int) k_dev);
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}
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libc_hidden_def (__xmknodat)
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