1READLINKAT(2)              Linux Programmer's Manual             READLINKAT(2)
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NAME

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

10       #define _ATFILE_SOURCE
11       #include <fcntl.h> /* Definition of AT_* constants */
12       #include <unistd.h>
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14       int readlinkat(int dirfd, const char *pathname,
15                      char *buf, size_t bufsiz);
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DESCRIPTION

18       The readlinkat() system call operates in exactly the same way as  read‐
19       link(2), except for the differences described in this manual page.
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21       If  the  pathname given in pathname is relative, then it is interpreted
22       relative to the directory referred to  by  the  file  descriptor  dirfd
23       (rather  than  relative to the current working directory of the calling
24       process, as is done by readlink(2) for a relative pathname).
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26       If pathname is relative and dirfd is the special value  AT_FDCWD,  then
27       pathname  is  interpreted  relative to the current working directory of
28       the calling process (like readlink(2)).
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30       If pathname is absolute, then dirfd is ignored.
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RETURN VALUE

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

37       The  same  errors  that  occur for readlink(2) can also occur for read‐
38       linkat().  The following additional errors can occur for readlinkat():
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40       EBADF  dirfd is not a valid file descriptor.
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42       ENOTDIR
43              pathname is relative and dirfd is a file descriptor referring to
44              a file other than a directory.
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VERSIONS

47       readlinkat() was added to Linux in kernel 2.6.16.
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CONFORMING TO

50       POSIX.1-2008.
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NOTES

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

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

59       This  page  is  part of release 3.22 of the Linux man-pages project.  A
60       description of the project, and information about reporting  bugs,  can
61       be found at http://www.kernel.org/doc/man-pages/.
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65Linux                             2008-08-21                     READLINKAT(2)
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