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acl_add_perm - Adds a permission to a set of permissions belonging to an ACL entry
#include <sys/acl.h>
int acl_add_perm(
acl_permset_t permset_d
acl_perm_t perm_d);
Specifies the permission set of the working storage internal representation of an ACL entry. Specifies the permission to be added to the permission set (a combination of ACL_EXECUTE, ACL_WRITE, and ACL_READ).
NOTE: This function is based on Draft 13 of the POSIX P1003.6 standard. The function may change as the P1003.6 standard is finalized.
The acl_add_perm() function adds the permission specified by perm_dcontained in the perms parameter to the permission set referred to by the permset_d parameter. Any permissions not designated in the perm_d parameter are left unchanged in the ACL entry. An attempt to add a permission already in the permission set is not treated as an error.
Upon successful completion, the acl_add_perm() function returns a value of 0 (zero). Otherwise a value of -1 is returned, and errno is set.
If any of the following conditions occur, the acl_add_perm() function sets errno to the corresponding value: The perm_d parameter does not refer to a valid ACL entry.
The permset_d parameter does not contain valid file permission bits. SH RELATED INFORMATION
acl_clear_perm(3),acl_delete_perm(3), acl_get_permset(3), acl_set_permset(3),acl_get_entry(3)
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