avc_context_to_sid - Online Linux Manual PageSection : 3
Updated : 27 May 2004
Source :
Note : SELinux API documentation

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NAMEavc_context_to_sid, avc_sid_to_context, avc_get_initial_sid − obtain and manipulate SELinux security ID's

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SYNOPSIS#include <selinux/selinux.h>
#include <selinux/avc.h> int avc_context_to_sid(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);

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DESCRIPTIONSecurity 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.

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RETURN VALUEavc_context_to_sid() and avc_sid_to_context() return zero on success. On error, −1 is returned and errno is set appropriately.

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ERRORSENOMEM  An attempt to allocate memory failed.

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NOTESAs 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.

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AUTHOREamon Walsh <ewalsh@tycho.nsa.gov>

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SEE ALSOavc_init(3), avc_has_perm(3), avc_cache_stats(3), avc_add_callback(3), getcon(3), freecon(3), selinux(8) 0

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