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MKNODAT(2) Linux Programmer's Manual MKNODAT(2)
mknodat - create a special or ordinary file relative to a directory
int mknodat(int dirfd, const char *pathname, mode_t mode, dev_t dev);
The mknodat() system call operates in exactly the same way as mknod(2),
except for the differences described in this manual page.
If the pathname given in pathname is relative, then it is interpreted
relative to the directory referred to by the file descriptor dirfd
(rather than relative to the current working directory of the calling
process, as is done by mknod(2) for a relative pathname).
If the pathname given in pathname is relative and dirfd is the special
value AT_FDCWD, then pathname is interpreted relative to the current
working directory of the calling process (like mknod(2)).
If the pathname given in pathname is absolute, then dirfd is ignored.
On success, mknodat() returns 0. On error, -1 is returned and errno is
set to indicate the error.
The same errors that occur for mknod(2) can also occur for mknodat().
The following additional errors can occur for mknodat():
EBADF dirfd is not a valid file descriptor.
pathname is a relative path and dirfd is a file descriptor
referring to a file other than a directory.
See openat(2) for an explanation of the need for mknodat().
This system call is non-standard but is proposed for inclusion in a
future revision of POSIX.1.
mknodat() was added to Linux in kernel 2.6.16.
Linux 2.6.16 2006-04-06 MKNODAT(2)
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