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avc_context_to_sid - Man Page

obtain and manipulate SELinux security ID's


#include <selinux/selinux.h>
#include <selinux/avc.h>

int avc_context_to_sid(const char *ctx, security_id_t *sid);

int avc_sid_to_context(security_id_t sid, char **ctx);

int avc_get_initial_sid(const char *name, security_id_t *sid);


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 identifier 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.



An attempt to allocate memory failed.


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(3) and sidput(3) functions, formerly used to adjust the reference count, are no-ops and are deprecated.


Eamon Walsh <ewalsh@tycho.nsa.gov>

See Also

avc_init(3), avc_has_perm(3), avc_cache_stats(3), avc_add_callback(3), getcon(3), freecon(3), selinux(8)

Referenced By

avc_add_callback(3), avc_cache_stats(3), avc_compute_create(3), avc_has_perm(3), avc_open(3).

The man pages avc_get_initial_context(3), avc_get_initial_sid(3), avc_sid_to_context(3), sidget(3) and sidput(3) are aliases of avc_context_to_sid(3).

27 May 2004 SELinux API documentation