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Minix/CD-ROM-2.0/MINIX/MANUALS/CAT2/ACCESS.2

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+ACCESS(2)                 Minix Programmer's Manual                  ACCESS(2)
+
+
+NAME
+     access - determine accessibility of file
+
+SYNOPSIS
+     #include <sys/types.h>
+     #include <unistd.h>
+
+     #define R_OK   4   /* test for read permission */
+     #define W_OK   2   /* test for write permission */
+     #define X_OK   1   /* test for execute (search) permission */
+     #define F_OK   0   /* test for presence of file */
+
+     int access(const char *path, mode_t mode)
+
+DESCRIPTION
+     Access checks the given file path for accessibility  according  to  mode,
+     which  is  an  inclusive  or of the bits R_OK, W_OK and X_OK.  Specifying
+     mode as F_OK (i.e., 0) tests whether the directories leading to the  file
+     can be searched and the file exists.
+
+     The real user ID and the group access list (including the real group  ID)
+     are  used  in  verifying  permission,  so  this call is useful to set-UID
+     programs.
+
+     Notice that only access bits are checked.  A directory may  be  indicated
+     as  writable  by  access, but an attempt to open it for writing will fail
+     (although files may be created there); a file may  look  executable,  but
+     execve will fail unless it is in proper format.
+
+RETURN VALUE
+     If path cannot be found or if any of the desired access modes  would  not
+     be granted, then a -1 value is returned; otherwise a 0 value is returned.
+
+ERRORS
+     Access to the file is denied if one or more of the following are true:
+
+     [ENOTDIR]      A component of the path prefix is not a directory.
+
+     [ENAMETOOLONG] The path name exceeds PATH_MAX characters.
+
+     [ENOENT]       The named file does not exist.
+
+     [EACCES]       Search permission is denied for a component  of  the  path
+                    prefix.
+
+     [ELOOP]        Too many symbolic links were  encountered  in  translating
+                    the pathname.  (Minix-vmd)
+
+
+
+
+
+4BSD                              May 22, 1986                               1
+
+
+
+ACCESS(2)                 Minix Programmer's Manual                  ACCESS(2)
+
+
+     [EROFS]        Write access is requested for a file on a  read-only  file
+                    system.
+
+     [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'' read,
+                    write, and execute mode bits, members of the file's  group
+                    other  than the owner have permission checked with respect
+                    to  the  ``group''  mode  bits,  and   all   others   have
+                    permissions  checked  with  respect  to the ``other'' mode
+                    bits.
+
+     [EFAULT]       Path points outside the process's allocated address space.
+
+     [EIO]          An I/O error occurred while reading from or writing to the
+                    file system.
+
+SEE ALSO
+     chmod(2), stat(2).
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+4BSD                              May 22, 1986                               2
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