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acl_get_qualifier (3)
  • acl_get_qualifier (3) ( FreeBSD man: Библиотечные вызовы )
  • >> acl_get_qualifier (3) ( Linux man: Библиотечные вызовы )

  • BSD mandoc
    Linux ACL  

    NAME

    acl_get_qualifier
    
     - retrieve the qualifier from an ACL entry
    
     
    

    LIBRARY

    Linux Access Control Lists library (libacl, -lacl).
     
    

    SYNOPSIS

       #include <sys/types.h>
       #include <sys/acl.h>
    void * acl_get_qualifier (acl_entry_t entry_d);
     

    DESCRIPTION

    The acl_get_qualifier ();
    function retrieves the qualifier from the ACL entry indicated by the argument entry_d into working storage and returns a pointer to that storage.

    If the value of the tag type in the ACL entry referred to by entry_d is ACL_USER, then the value returned by acl_get_qualifier ();
    is a pointer to type uid_t If the value of the tag type in the ACL entry referred to by entry_d is ACL_GROUP, then the value returned by acl_get_qualifier ();
    is a pointer to type gid_t If the tag type in the ACL entry referred to by entry_d is a tag type for which a qualifier is not supported, acl_get_qualifier ();
    returns a value of (void *)NULL and the function fails. Subsequent operations using the returned pointer operate on an independent copy of the qualifier in working storage, and will not change the qualifier of the ACL entry.

    This function may cause memory to be allocated. The caller should free any releasable memory, when the new qualifier is no longer required, by calling acl_free ();
    with the void value returned by acl_get_qualifier ();
    as an argument.

    The argument entry_d and any other ACL entry descriptors that refer to entries within the ACL containing the entry referred to by entry_d continue to refer to those entries. The order of all existing entries in the ACL containing the entry referred to by entry_d remains unchanged.  

    RETURN VALUE

    On success, the function returns a pointer to the tag qualifier that was retrieved into ACL working storage. On error, a value of (void *)NULL is returned and errno is set appropriately.  

    ERRORS

    If any of the following conditions occur, the acl_get_qualifier ();
    function returns (void *)NULL and sets errno to the corresponding value:

    Bq Er EINVAL
    The argument entry_d is not a valid descriptor for an ACL entry.

    The value of the tag type in the ACL entry referenced by the argument entry_d is neither ACL_USER nor ACL_GROUP.

    Bq Er ENOMEM
    The value to be returned requires more memory than is allowed by the hardware or system-imposed memory management constraints.

     

    STANDARDS

    IEEE Std 1003.1e draft 17 (lqPOSIX.1erq, abandoned)  

    SEE ALSO

    acl_create_entry3, acl_free3, acl_get_entry3, acl_get_permset3, acl_get_tag_type3, acl_set_permset3, acl_set_qualifier3, acl_set_tag_type3, acl(5)  

    AUTHOR

    Derived from the FreeBSD manual pages written by An Robert N M Watson Aq rwatson@FreeBSD.org , and adapted for Linux by An Andreas Gruenbacher Aq a.gruenbacher@bestbits.at .


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    STANDARDS
    SEE ALSO
    AUTHOR


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