access(2)							   System Calls 							 access(2)

NAME

       access - determine accessibility of a file

SYNOPSIS

       #include <unistd.h>

       int access(const char *path, int amode);

DESCRIPTION

       The  access() function checks the file named by the pathname pointed to by the path argument for accessibility according to the bit pattern
       contained in amode, using the real user ID in place of the effective user ID and the real group ID in place of the effective group ID. This
       allows a setuid process to verify that the user running it would have had permission to access this file.

       The  value  of  amode  is either the bitwise inclusive OR of the access permissions to be checked (R_OK, W_OK, X_OK) or the existence test,
       F_OK.

       These constants are defined in <unistd.h> as follows:

       R_OK	Test for read permission.

       W_OK	Test for write permission.

       X_OK	Test for execute or search permission.

       F_OK	Check existence of file

       See intro(2) for additional information about "File Access Permission".

       If any access permissions are to be checked, each will be checked individually, as described in intro(2). If the  process  has  appropriate
       privileges, an implementation may indicate success for X_OK even if none of the execute file permission bits are set.

RETURN VALUES

       If the requested access is permitted, access() succeeds and returns 0. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The access() function will fail if:

       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.

       EFAULT		       path points to an illegal address.

       EINTR		       A signal was caught during the access() function.

       ELOOP		       Too many symbolic links were encountered in resolving path.

       ELOOP		       A loop exists in symbolic links encountered during resolution of the path argument.

       ENAMETOOLONG	       The length of the path argument exceeds {PATH_MAX}, or  a  pathname  component  is  longer  than  {NAME_MAX}  while
			       _POSIX_NO_TRUNC is in effect.

       ENOENT		       A component of path does not name an existing file or path is an empty string.

       ENOLINK		       path points to a remote machine and the link to that machine is no longer active.

       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.

       The access() function may fail if:

       EINVAL		       The value of the amode argument is invalid.

       ENAMETOOLONG	       Pathname resolution of a symbolic link produced an intermediate result whose length exceeds {PATH_MAX}.

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

USAGE

       Additional  values of amode other than the set defined in the description might be valid, for example, if a system has extended access con-
       trols.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       intro(2), chmod(2), stat(2), attributes(5), standards(5)

SunOS 5.10							    23 Apr 2002 							 access(2)