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avc_context_to_sid(3) — Linux manual page

avc_context_to_sid(3)   SELinux API documentationavc_context_to_sid(3)

NAME        top

       avc_context_to_sid, avc_sid_to_context, avc_get_initial_sid -       obtain and manipulate SELinux security ID's

SYNOPSIS        top

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

DESCRIPTION        top

       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 givencontext in the       memory referenced bysid.avc_sid_to_context() returns a copy of the context represented bysid in the memory referenced byctx.  The user must free the copy       withfreecon(3).avc_get_initial_sid() returns a SID for the kernel initial       security identifier specified byname.

RETURN VALUE        top

avc_context_to_sid() andavc_sid_to_context() return zero on       success.  On error, -1 is returned anderrno is set appropriately.

ERRORS        top

ENOMEMAn attempt to allocate memory failed.

NOTES        top

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

AUTHOR        top

       Eamon Walsh <ewalsh@tycho.nsa.gov>

SEE ALSO        top

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

COLOPHON        top

       This page is part of theselinux (Security-Enhanced Linux user-       space libraries and tools) project.  Information about the project       can be found at ⟨https://github.com/SELinuxProject/selinux/wiki⟩.       If you have a bug report for this manual page, see       ⟨https://github.com/SELinuxProject/selinux/wiki/Contributing⟩.       This page was obtained from the project's upstream Git repository       ⟨https://github.com/SELinuxProject/selinux⟩ on 2025-08-11.  (At       that time, the date of the most recent commit that was found in       the repository was 2025-08-04.)  If you discover any rendering       problems in this HTML version of the page, or you believe there is       a better or more up-to-date source for the page, or you have       corrections or improvements to the information in this COLOPHON       (which isnot part of the original manual page), send a mail to       man-pages@man7.org                               27 May 2004avc_context_to_sid(3)

Pages that refer to this page:avc_add_callback(3), avc_cache_stats(3), avc_compute_create(3), avc_context_to_sid(3), avc_has_perm(3), avc_open(3)

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