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avc_context_to_sid(3)

27 May 2004
Aliases: avc_get_initial_context(3), avc_get_initial_context(3), avc_get_initial_sid(3), avc_get_initial_sid(3), avc_sid_to_context(3), avc_sid_to_context(3), sidget(3), sidget(3), sidput(3), sidput(3)

libselinux1-dev

SELinux development headers

libselinux-devel

Development files for the SELinux runtime library

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(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);

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 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.

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

AUTHOR

Eamon Walsh <>
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