Man Readlinkat en anglais
READLINKAT(2)              Linux Programmer's Manual             READLINKAT(2)



 

NAME


       readlinkat - read value of a symbolic link relative to a directory file
       descriptor

 

SYNOPSIS


       #define _ATFILE_SOURCE
       #include  /* Definition of AT_* constants */
       #include 

       int readlinkat(int dirfd, const char *pathname,
                      char *buf, size_t bufsiz);

 

DESCRIPTION






       The readlinkat() system call operates in exactly the same way as  read-
       link(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 readlink(2) for a relative pathname).

       If 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 readlink(2)).

       If pathname is absolute, then dirfd is ignored.

 

RETURN VALUE


       On success, readlinkat() returns the number of bytes placed in buf.  On
       error, -1 is returned and errno is set to indicate the error.

 

ERRORS


       The  same  errors  that  occur for readlink(2) can also occur for read-
       linkat().  The following additional errors can occur for readlinkat():

       EBADF  dirfd is not a valid file descriptor.

 

       ENOTDIR


              pathname is relative and dirfd is a file descriptor referring to
              a file other than a directory.

 

VERSIONS


       readlinkat() was added to Linux in kernel 2.6.16.

 

CONFORMING TO


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

 

NOTES


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

 

SEE ALSO


       openat(2), readlink(2), path_resolution(7)

 

COLOPHON


       This page is part of release 3.05 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/.



Linux                             2006-07-21                     READLINKAT(2)