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access(2)							     access(2)

Name
       access - determine the accessibility of file

Syntax
       #include <unistd.h>
       accessible = access(path, mode)
       int accessible;
       char *path;
       int mode;

Description
       The system call, checks the given file path for accessibility according
       to mode.	 The argument mode is an inclusive OR of the bits R_OK,	 W_OK,
       and  X_OK.   Specifying	the  argument  mode  as F_OK tests whether the
       directories leading to the file can be searched and  whether  the  file
       exists.

       The  real  user	ID and the group access list (including the real group
       ID) are used to verify permissions.  This call  is  useful  to  set-UID
       programs.

       Note  that  only access bits are checked.  The call may indicate that a
       directory is writeable, but an attempt to  open	the  directory	fails,
       although	 files are present in the directory.  Additionally, a file may
       appear to be executable, but fails unless the file is in proper format.

       If a path cannot be found, or if	 the  desired  access  modes  are  not
       granted, a -1 value is returned; otherwise, a 0 value is returned.

Diagnostics
       Access to the file is denied if any of the following is true:

       [EACCES]	      Permission  bits	of  the	 file  mode  do not permit the
		      requested access or search permission  is	 denied	 on  a
		      component	 of  the path prefix.  The owner of a file has
		      permission checked with respect  to  the	owner's	 read,
		      write,  and  execute  mode  bits.	 Members of the file's
		      group, other than the  owner,  have  permission  checked
		      with  respect to the group's mode bits.  All others have
		      permissions checked with respect to the other mode bits.

       [EFAULT]	      The path points outside the process's allocated  address
		      space.

       [EIO]	      An  I/O  error occurred while reading from or writing to
		      the file system.

       [ELOOP]	      Too many symbolic links were encountered in  translating
		      the pathname.

       [ENAMETOOLONG] A	 path  component  length exceeds 255 characters or the
		      length of path exceeds 1023 characters.

       [ENOENT]	      The file referred to by path does not exist or the  path
		      points to an empty string and the environment defined is
		      POSIX or SYSTEM_FIVE.

       [ENOTDIR]      A component of the path prefix is not a directory.

       [EROFS]	      Write access is requested for a file on a read-only file
		      system.

       [ESTALE]	      The  file handle given in the argument was invalid.  The
		      file referred to by that file handle no longer exists or
		      has been revoked.

       [ETIMEDOUT]    A connect request or remote file operation fails because
		      the connected party did not respond after	 a  period  of
		      time determined by the communications protocol.

       [ETXTBSY]      Write  access  is requested for a pure procedure (shared
		      text) file that is being executed.

See Also
       chmod(2), stat(2)

								     access(2)
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