ACCESS(2)ACCESS(2)
NAME
access – determine accessibility of file
SYNOPSIS
#include <u.h>
#include <libc.h>
int access(char *name, int mode)
DESCRIPTION
Access
evaluates the given
file
name
for accessibility.
If mode&4
is nonzero,
read permission is expected;
if mode&2,
write permission;
if mode&1,
execute permission.
If mode==0,
the file merely need exist.
In any case
all directories leading to the file
must permit searches.
Zero is returned if the desired access is permitted,
–1 if not.
Only access for open is checked.
A file may look executable, but
exec(2)
will fail unless it is in proper format.
The include file
unhandled troff command .F
defines
AEXIST=0,
AEXEC=1,
AWRITE=2,
and
AREAD=4.
SOURCE
/sys/src/libc/9sys/access.c
SEE
stat(2)
DIAGNOSTICS
Sets
errstr.
BUGS
Since file permissions are checked by the server and group information
is not known to the client,
access
must open the file to check permissions.
(It calls
stat(2)
to check simple existence.)