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.\" @(#)$RCSfile: Cns_access.man,v $ $Revision: 3515 $ $Date: 2010-04-05 09:51:26 +0200 (Mon, 05 Apr 2010) $ CERN IT-PDP/DM Jean-Philippe Baud
.\" Copyright (C) 1999-2010 by CERN/IT/PDP/DM
.\" All rights reserved
.\"
.TH CNS_ACCESS 3 "$Date: 2010-04-05 09:51:26 +0200 (Mon, 05 Apr 2010) $" CASTOR "Cns Library Functions"
.SH NAME
Cns_access \- check existence/accessibility of a file/directory
.SH SYNOPSIS
Under Unix:
.br
.B #include <sys/types.h>
.br
.B #include <unistd.h>
.br
\fB#include "Cns_api.h"\fR
.sp
Under Windows/NT:
.br
.B #include <sys/types.h>
.br
.B #define R_OK 4
.br
.B #define W_OK 2
.br
.B #define X_OK 1
.br
.B #define F_OK 0
.br
\fB#include "Cns_api.h"\fR
.sp
.BI "int Cns_access (const char *" path ,
.BI "int " amode );
.SH DESCRIPTION
.B Cns_access
checks in the name server database the existence or the accessibility of the
file/directory
.I path
according to the bit pattern in
.I amode
using the real user ID.
.TP
.I path
specifies the logical pathname relative to the current CASTOR directory or
the full CASTOR pathname.
.TP
.I amode
the bit pattern is built by an OR of the constants defined in
.RB < unistd.h >
under Unix or to be explicitly defined under Windows/NT:
.RS
.TP
.B R_OK
test for read permission
.TP
.B W_OK
test for write permission
.TP
.B X_OK
test for search/execute permission
.TP
.B F_OK
test for existence of the directory/file.
.RE
.SH RETURN VALUE
This routine returns 0 if the operation was successful or -1 if the operation
failed. In the latter case,
.B serrno
is set appropriately.
.SH ERRORS
.TP 1.3i
.B ENOENT
The named file/directory does not exist.
.TP
.B EACCES
Search permission is denied on a component of the
.I path
prefix or specified access to the file itself is denied.
.TP
.B EFAULT
.I path
is a NULL pointer.
.TP
.B ENOTDIR
A component of
.I path
prefix is not a directory.
.TP
.B EINVAL
.I amode
is invalid.
.TP
.B ENAMETOOLONG
The length of
.I path
exceeds
.B CA_MAXPATHLEN
or the length of a
.I path
component exceeds
.BR CA_MAXNAMELEN .
.TP
.B SENOSHOST
Host unknown.
.TP
.B SENOSSERV
Service unknown.
.TP
.B SECOMERR
Communication error.
.TP
.B ENSNACT
Name server is not running or is being shutdown.
.SH SEE ALSO
.BR Castor_limits(4) ,
.BR Cns_chdir(3) ,
.BR Cns_chmod(3) ,
.B Cns_stat(3)
.SH AUTHOR
\fBCASTOR\fP Team <castor.support@cern.ch>
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