acl_free - Linux

Overview

The acl_free command takes an ACL (access control list) entry previously created by getfacl and frees its allocated memory. This is typically done after the ACL entry is no longer needed or before it is modified.

Syntax

acl_free(void *acl_entry)

Parameters:

• acl_entry: A pointer to the ACL entry to be freed.

Options/Flags

None.

Examples

To demonstrate the usage of acl_free, consider the following C program:

#include <stdio.h>
#include <acl/libacl.h>

int main() {
    acl_t acl = acl_get(path, ACL_TYPE_ACCESS);
    if (acl == NULL) {
        perror("acl_get");
        return 1;
    }

    acl_entry_t entry;
    int index = acl_get_entry(acl, 0, &entry);
    if (index < 0) {
        perror("acl_get_entry");
        acl_free(acl);
        return 1;
    }

    acl_free(entry);
    acl_free(acl);

    return 0;
}

Common Issues

None.

Integration

• acl_free is commonly used in conjunction with getfacl to retrieve and manipulate ACL entries.
• It can be integrated into scripts or programs that require dynamic ACL management.

Related Commands

• getfacl – Retrieves ACL information from a file or directory.
• setfacl – Sets ACL information on a file or directory.
• aclcheck – Verifies and optionally modifies ACLs.