Calculate the group class mask for an access control list (ACL)
#include <sys/acl.h> int acl_calc_mask( acl_t *acl_p );
- A pointer to the ACL whose mask you want to calculate.
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The acl_calc_mask() function calculates the file group mask for an ACL, as the union of the permissions granted by the ACL_GROUP (named group), ACL_GROUP_OBJ (owning group), and ACL_USER (named user) tags. If the ACL already has a mask entry, the function updates it; otherwise it adds a mask entry.
0, or -1 if an error occurred (errno is set).
- The acl_p argument isn't the address of a pointer to a valid ACL.
- There wasn't enough memory available to allocate space for a new mask entry.
This function is based on the withdrawn POSIX draft P1003.1e.