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mknodat() - Unix, Linux System Call


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NAME

mknodat - create a special or ordinary file relative to a directory file descriptor

SYNOPSIS

#include <sys/stat.h> 

int mknodat(int dirfd, const char *pathname, mode_t mode ", dev_t " dev );

DESCRIPTION

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.

RETURN VALUE

On success, mknodat() returns 0. On error, -1 is returned and errno is set to indicate the error.

ERRORS

The same errors that occur for mknod(2) can also occur for mknodat(). The following additional errors can occur for mknodat():
TagDescription
EBADF dirfd is not a valid file descriptor.
ENOTDIR
  pathname is a relative path and dirfd is a file descriptor referring to a file other than a directory.

NOTES

See openat(2) for an explanation of the need for mknodat().

CONFORMING TO

This system call is non-standard but is proposed for inclusion in a future revision of POSIX.1.

VERSIONS

mknodat() was added to Linux in kernel 2.6.16.

SEE ALSO



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