diff options
Diffstat (limited to 'sys/kern/kern_exit.c')
| -rw-r--r-- | sys/kern/kern_exit.c | 72 |
1 files changed, 71 insertions, 1 deletions
diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c index 0746e58..d7e4202 100644 --- a/sys/kern/kern_exit.c +++ b/sys/kern/kern_exit.c @@ -36,7 +36,7 @@ * SUCH DAMAGE. * * @(#)kern_exit.c 8.7 (Berkeley) 2/12/94 - * $Id: kern_exit.c,v 1.34 1996/07/27 03:23:42 dyson Exp $ + * $Id: kern_exit.c,v 1.35 1996/07/30 03:08:37 dyson Exp $ */ #include "opt_ktrace.h" @@ -81,6 +81,16 @@ static int wait1 __P((struct proc *, struct wait_args *, int [], int)); /* + * callout list for things to do at exit time + */ +typedef struct exit_list_element { + struct exit_list_element *next; + exitlist_fn function; +} *ele_p; + +static ele_p exit_list; + +/* * exit -- * Death of process. */ @@ -109,6 +119,7 @@ exit1(p, rv) { register struct proc *q, *nq; register struct vmspace *vm; + ele_p ep = exit_list; if (p->p_pid == 1) { printf("init died (signal %d, exit %d)\n", @@ -118,6 +129,16 @@ exit1(p, rv) #ifdef PGINPROF vmsizmon(); #endif + /* + * Check if any LKMs need anything done at process exit + * e.g. SYSV IPC stuff + * XXX what if one of these generates an error? + */ + while(ep) { + (*ep->function)(p); + ep = ep->next; + } + if (p->p_flag & P_PROFIL) stopprofclock(p); MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage), @@ -473,3 +494,52 @@ proc_reparent(child, parent) LIST_INSERT_HEAD(&parent->p_children, child, p_sibling); child->p_pptr = parent; } + +/********************************************************* + * general routines to handle adding/deleting items on the + * exit callout list + ***** + * Take the arguments given and put them onto the exit callout list. + * However first make sure that it's not already there. + * returns 0 on success. + */ +int +at_exit(exitlist_fn function) +{ + ele_p ep; + if(rm_at_exit(function)) { + printf("exit callout entry already present\n"); + } + ep = malloc(sizeof(*ep),M_TEMP,M_NOWAIT); + if(!ep) return ENOMEM; + ep->next = exit_list; + ep->function = function; + exit_list = ep; + return 0; +} +/* + * Scan the exit callout list for the given items and remove them. + * Returns the number of items removed. + */ +int +rm_at_exit(exitlist_fn function) +{ + ele_p *epp,ep; + int count = 0; + + epp = &exit_list; + ep = *epp; + while(ep) { + if(ep->function == function) { + *epp = ep->next; + free(ep,M_TEMP); + count++; + } else { + epp = &ep->next; + } + ep = *epp; + } + return count; +} + + |
