|OPENAT(2)||Linux Programmer's Manual||OPENAT(2)|
NAMEopenat - open a file relative to a directory file descriptor
int openat(int dirfd , const char * pathname , int flags );
int openat(int dirfd , const char * pathname , int flags , mode_t mode );
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
- Since glibc 2.10:
- _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
- Before glibc 2.10:
DESCRIPTIONThe openat() system call operates in exactly the same way as open(2), except for the differences described in this manual page.
RETURN VALUEOn success, openat() returns a new file descriptor. On error, -1 is returned and errno is set to indicate the error.
ERRORSThe same errors that occur for open(2) can also occur for openat(). The following additional errors can occur for openat():
- dirfd is not a valid file descriptor.
- pathname is relative and dirfd is a file descriptor referring to a file other than a directory.
VERSIONSopenat() was added to Linux in kernel 2.6.16; library support was added to glibc in version 2.4.
CONFORMING TOPOSIX.1-2008. A similar system call exists on Solaris.
NOTESopenat() and other similar system calls suffixed "at" are supported for two reasons.
SEE ALSOfaccessat(2), fchmodat(2), fchownat(2), fstatat(2), futimesat(2), linkat(2), mkdirat(2), mknodat(2), open(2), readlinkat(2), renameat(2), symlinkat(2), unlinkat(2), utimensat(2), mkfifoat(3), path_resolution(7)
COLOPHONThis page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.