avc_context_to_sid(3) SELinux API documentation avc_context_to_sid(3)NAME
avc_context_to_sid, avc_sid_to_context, avc_get_initial_sid - obtain
and manipulate SELinux security ID's.
SYNOPSIS
#include <selinux/selinux.h>
#include <selinux/avc.h>
int avc_context_to_sid(security_context_t ctx, security_id_t *sid);
int avc_sid_to_context(security_id_t sid, security_context_t *ctx);
int avc_get_initial_sid(const char *name, security_id_t *sid);
DESCRIPTION
Security ID's (SID's) are opaque representations of security contexts,
managed by the userspace AVC.
avc_context_to_sid returns a SID for the given context in the memory
referenced by sid.
avc_sid_to_context returns a copy of the context represented by sid in
the memory referenced by ctx. The user must free the copy with
freecon(3).
avc_get_initial_sid returns a SID for the kernel initial security iden‐
tifier specified by name.
RETURN VALUE
avc_context_to_sid and avc_sid_to_context return zero on success. On
error, -1 is returned and errno is set appropriately.
ERRORS
ENOMEM An attempt to allocate memory failed.
NOTES
As of libselinux version 2.0.86, SID's are no longer reference counted.
A SID will be valid from the time it is first obtained until the next
call to avc_destroy(3). The sidget and sidput functions, formerly used
to adjust the reference count, are no-ops and are deprecated.
AUTHOR
Eamon Walsh <ewalsh@tycho.nsa.gov>
SEE ALSOavc_init(3), avc_has_perm(3), avc_cache_stats(3), avc_add_callback(3),
getcon(3), freecon(3)selinux(8)
27 May 2004 avc_context_to_sid(3)
