1 /* 2 * Copyright (c) 1999-2000 Sendmail, Inc. and its suppliers. 3 * All rights reserved. 4 * 5 * By using this file, you agree to the terms and conditions set 6 * forth in the LICENSE file which can be found at the top level of 7 * the sendmail distribution. 8 * 9 * Contributed by Exactis.com, Inc. 10 * 11 */ 12 13 #ifndef lint 14 static char id[] = "@(#)$Id: shmticklib.c,v 8.6 2000/02/26 01:32:27 gshapiro Exp $"; 15 #endif /* ! lint */ 16 17 #if _FFR_SHM_STATUS 18 # if SFIO 19 # include <sfio/stdio.h> 20 # else /* !SFIO */ 21 # include <stdio.h> 22 # endif /* SFIO */ 23 # include <sys/types.h> 24 # include <sys/ipc.h> 25 # include <sys/shm.h> 26 27 # include "statusd_shm.h" 28 29 /* 30 ** SHMTICK -- increment a shared memory variable 31 ** 32 ** Parameters: 33 ** inc_me -- identity of shared memory segment 34 ** what -- which variable to increment 35 ** 36 ** Returns: 37 ** none 38 */ 39 40 void 41 shmtick(inc_me, what) 42 int inc_me; 43 int what; 44 { 45 static int shmid = -1; 46 static STATUSD_SHM *sp = (STATUSD_SHM *)-1; 47 static unsigned int cookie = 0; 48 49 if (shmid < 0) 50 { 51 int size = sizeof(STATUSD_SHM); 52 53 shmid = shmget(STATUSD_SHM_KEY, size, 0); 54 if (shmid < 0) 55 return; 56 } 57 if ((unsigned long *)sp == (unsigned long *)-1) 58 { 59 sp = (STATUSD_SHM *)shmat(shmid, NULL, 0); 60 if ((unsigned long *)sp == (unsigned long *)-1) 61 return; 62 } 63 if (sp->magic != STATUSD_MAGIC) 64 { 65 /* 66 ** possible race condition, wait for 67 ** statusd to initialize. 68 */ 69 70 return; 71 } 72 if (what >= STATUSD_LONGS) 73 what = STATUSD_LONGS - 1; 74 if (inc_me >= STATUSD_LONGS) 75 inc_me = STATUSD_LONGS - 1; 76 77 if (sp->ul[STATUSD_COOKIE] != cookie) 78 { 79 cookie = sp->ul[STATUSD_COOKIE]; 80 ++(sp->ul[inc_me]); 81 } 82 ++(sp->ul[what]); 83 } 84 #endif /* _FFR_SHM_STATUS */ 85