Date: Tue, 13 Aug 2013 03:07:49 +0000 (UTC) From: Mark Johnston <markj@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r254266 - in head: share/man/man9 sys/kern sys/sys Message-ID: <201308130307.r7D37nZl017329@svn.freebsd.org>
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Author: markj Date: Tue Aug 13 03:07:49 2013 New Revision: 254266 URL: http://svnweb.freebsd.org/changeset/base/254266 Log: Add event handlers for module load and unload events. The load handlers are called after the module has been loaded, and the unload handlers are called before the module is unloaded. Moreover, the module unload handlers may return an error to prevent the unload from proceeding. Reviewed by: avg MFC after: 2 weeks Modified: head/share/man/man9/EVENTHANDLER.9 head/sys/kern/kern_linker.c head/sys/sys/eventhandler.h Modified: head/share/man/man9/EVENTHANDLER.9 ============================================================================== --- head/share/man/man9/EVENTHANDLER.9 Tue Aug 13 02:31:46 2013 (r254265) +++ head/share/man/man9/EVENTHANDLER.9 Tue Aug 13 03:07:49 2013 (r254266) @@ -23,7 +23,7 @@ .\" SUCH DAMAGE. .\" $FreeBSD$ .\" -.Dd May 11, 2012 +.Dd August 1, 2013 .Dt EVENTHANDLER 9 .Os .Sh NAME @@ -199,6 +199,12 @@ Callbacks invoked when a new network int Callbacks invoked when a network interface is taken down. .It Vt bpf_track Callbacks invoked when a BPF listener attaches to/detaches from network interface. +.It Vt mod_load +Callbacks invoked after a module has been loaded. +.It Vt mod_unload +Callbacks invoked before a module is about to be unloaded. +These callbacks may be used to return an error and prevent the unload from +proceeding. .It Vt power_profile_change Callbacks invoked when the power profile of the system changes. .It Vt process_exec Modified: head/sys/kern/kern_linker.c ============================================================================== --- head/sys/kern/kern_linker.c Tue Aug 13 02:31:46 2013 (r254265) +++ head/sys/kern/kern_linker.c Tue Aug 13 03:07:49 2013 (r254266) @@ -45,6 +45,7 @@ __FBSDID("$FreeBSD$"); #include <sys/module.h> #include <sys/mount.h> #include <sys/linker.h> +#include <sys/eventhandler.h> #include <sys/fcntl.h> #include <sys/jail.h> #include <sys/libkern.h> @@ -1046,6 +1047,9 @@ kern_kldload(struct thread *td, const ch lf->userrefs++; if (fileid != NULL) *fileid = lf->id; + + EVENTHANDLER_INVOKE(mod_load, lf); + #ifdef HWPMC_HOOKS KLD_DOWNGRADE(); pkm.pm_file = lf->filename; @@ -1101,8 +1105,10 @@ kern_kldunload(struct thread *td, int fi if (lf) { KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); - /* Check if there are DTrace probes enabled on this file. */ - if (lf->nenabled > 0) { + EVENTHANDLER_INVOKE(mod_unload, lf, &error); + if (error != 0) + error = EBUSY; + else if (lf->nenabled > 0) { printf("kldunload: attempt to unload file that has" " DTrace probes enabled\n"); error = EBUSY; Modified: head/sys/sys/eventhandler.h ============================================================================== --- head/sys/sys/eventhandler.h Tue Aug 13 02:31:46 2013 (r254265) +++ head/sys/sys/eventhandler.h Tue Aug 13 03:07:49 2013 (r254266) @@ -266,4 +266,11 @@ EVENTHANDLER_DECLARE(nmbclusters_change, EVENTHANDLER_DECLARE(nmbufs_change, uma_zone_chfn); EVENTHANDLER_DECLARE(maxsockets_change, uma_zone_chfn); +/* Module load and unload events */ +struct linker_file; +typedef void (*mod_load_fn)(void *, struct linker_file *); +typedef void (*mod_unload_fn)(void *, struct linker_file *, int *); +EVENTHANDLER_DECLARE(mod_load, mod_load_fn); +EVENTHANDLER_DECLARE(mod_unload, mod_unload_fn); + #endif /* SYS_EVENTHANDLER_H */
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