| 1 | /* |
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| 2 | * Copyright (c) 1999-2000 Sendmail, Inc. and its suppliers. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * By using this file, you agree to the terms and conditions set |
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| 6 | * forth in the LICENSE file which can be found at the top level of |
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| 7 | * the sendmail distribution. |
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| 8 | * |
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| 9 | * Contributed by Exactis.com, Inc. |
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| 10 | * |
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| 11 | */ |
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| 12 | |
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| 13 | #include <sm/gen.h> |
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| 14 | SM_RCSID("@(#)$Id: shmticklib.c,v 1.1.1.1 2003-04-08 15:06:12 zacheiss Exp $") |
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| 15 | |
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| 16 | #if _FFR_SHM_STATUS |
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| 17 | # include <sys/types.h> |
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| 18 | # include <sys/ipc.h> |
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| 19 | # include <sys/shm.h> |
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| 20 | |
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| 21 | # include "statusd_shm.h" |
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| 22 | |
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| 23 | /* |
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| 24 | ** SHMTICK -- increment a shared memory variable |
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| 25 | ** |
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| 26 | ** Parameters: |
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| 27 | ** inc_me -- identity of shared memory segment |
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| 28 | ** what -- which variable to increment |
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| 29 | ** |
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| 30 | ** Returns: |
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| 31 | ** none |
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| 32 | */ |
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| 33 | |
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| 34 | void |
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| 35 | shmtick(inc_me, what) |
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| 36 | int inc_me; |
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| 37 | int what; |
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| 38 | { |
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| 39 | static int shmid = -1; |
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| 40 | static STATUSD_SHM *sp = (STATUSD_SHM *)-1; |
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| 41 | static unsigned int cookie = 0; |
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| 42 | |
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| 43 | if (shmid < 0) |
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| 44 | { |
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| 45 | int size = sizeof(STATUSD_SHM); |
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| 46 | |
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| 47 | shmid = shmget(STATUSD_SHM_KEY, size, 0); |
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| 48 | if (shmid < 0) |
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| 49 | return; |
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| 50 | } |
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| 51 | if ((unsigned long *) sp == (unsigned long *)-1) |
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| 52 | { |
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| 53 | sp = (STATUSD_SHM *) shmat(shmid, NULL, 0); |
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| 54 | if ((unsigned long *) sp == (unsigned long *) -1) |
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| 55 | return; |
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| 56 | } |
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| 57 | if (sp->magic != STATUSD_MAGIC) |
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| 58 | { |
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| 59 | /* |
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| 60 | ** possible race condition, wait for |
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| 61 | ** statusd to initialize. |
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| 62 | */ |
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| 63 | |
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| 64 | return; |
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| 65 | } |
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| 66 | if (what >= STATUSD_LONGS) |
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| 67 | what = STATUSD_LONGS - 1; |
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| 68 | if (inc_me >= STATUSD_LONGS) |
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| 69 | inc_me = STATUSD_LONGS - 1; |
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| 70 | |
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| 71 | if (sp->ul[STATUSD_COOKIE] != cookie) |
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| 72 | { |
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| 73 | cookie = sp->ul[STATUSD_COOKIE]; |
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| 74 | ++(sp->ul[inc_me]); |
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| 75 | } |
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| 76 | ++(sp->ul[what]); |
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| 77 | } |
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| 78 | #endif /* _FFR_SHM_STATUS */ |
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