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Diffstat (limited to 'contrib/sendmail/libsm/sem.c')
| -rw-r--r-- | contrib/sendmail/libsm/sem.c | 201 |
1 files changed, 0 insertions, 201 deletions
diff --git a/contrib/sendmail/libsm/sem.c b/contrib/sendmail/libsm/sem.c deleted file mode 100644 index a429cf4a2ed2..000000000000 --- a/contrib/sendmail/libsm/sem.c +++ /dev/null @@ -1,201 +0,0 @@ -/* - * Copyright (c) 2000-2001, 2005 Sendmail, Inc. and its suppliers. - * All rights reserved. - * - * By using this file, you agree to the terms and conditions set - * forth in the LICENSE file which can be found at the top level of - * the sendmail distribution. - */ - -#include <sm/gen.h> -SM_RCSID("@(#)$Id: sem.c,v 1.12 2005/03/25 21:27:02 ca Exp $") - -#if SM_CONF_SEM -# include <stdlib.h> -# include <unistd.h> -# include <sm/sem.h> -# include <sm/heap.h> - -/* -** SM_SEM_START -- initialize semaphores -** -** Parameters: -** key -- key for semaphores. -** nsem -- number of semaphores. -** semflg -- flag for semget(), if 0, use a default. -** owner -- create semaphores. -** -** Returns: -** id for semaphores. -** < 0 on failure. -*/ - -int -sm_sem_start(key, nsem, semflg, owner) - key_t key; - int nsem; - int semflg; - bool owner; -{ - int semid, i; - unsigned short *semvals; - - semvals = NULL; - if (semflg == 0) - semflg = (SEM_A|SEM_R)|((SEM_A|SEM_R) >> 3); - if (owner) - semflg |= IPC_CREAT|IPC_EXCL; - semid = semget(key, nsem, semflg); - if (semid < 0) - goto error; - - if (owner) - { - union semun semarg; - - semvals = (unsigned short *) sm_malloc(nsem * sizeof semvals); - if (semvals == NULL) - goto error; - semarg.array = semvals; - - /* initialize semaphore values to be available */ - for (i = 0; i < nsem; i++) - semvals[i] = 1; - if (semctl(semid, 0, SETALL, semarg) < 0) - goto error; - } - return semid; - -error: - if (semvals != NULL) - sm_free(semvals); - if (semid >= 0) - sm_sem_stop(semid); - return -1; -} - -/* -** SM_SEM_STOP -- stop using semaphores. -** -** Parameters: -** semid -- id for semaphores. -** -** Returns: -** 0 on success. -** < 0 on failure. -*/ - -int -sm_sem_stop(semid) - int semid; -{ - return semctl(semid, 0, IPC_RMID, NULL); -} - -/* -** SM_SEM_ACQ -- acquire semaphore. -** -** Parameters: -** semid -- id for semaphores. -** semnum -- number of semaphore. -** timeout -- how long to wait for operation to succeed. -** -** Returns: -** 0 on success. -** < 0 on failure. -*/ - -int -sm_sem_acq(semid, semnum, timeout) - int semid; - int semnum; - int timeout; -{ - int r; - struct sembuf semops[1]; - - semops[0].sem_num = semnum; - semops[0].sem_op = -1; - semops[0].sem_flg = SEM_UNDO | - (timeout != SM_TIME_FOREVER ? 0 : IPC_NOWAIT); - if (timeout == SM_TIME_IMMEDIATE || timeout == SM_TIME_FOREVER) - return semop(semid, semops, 1); - do - { - r = semop(semid, semops, 1); - if (r == 0) - return r; - sleep(1); - --timeout; - } while (timeout > 0); - return r; -} - -/* -** SM_SEM_REL -- release semaphore. -** -** Parameters: -** semid -- id for semaphores. -** semnum -- number of semaphore. -** timeout -- how long to wait for operation to succeed. -** -** Returns: -** 0 on success. -** < 0 on failure. -*/ - -int -sm_sem_rel(semid, semnum, timeout) - int semid; - int semnum; - int timeout; -{ - int r; - struct sembuf semops[1]; - -#if PARANOID - /* XXX should we check whether the value is already 0 ? */ - SM_REQUIRE(sm_get_sem(semid, semnum) > 0); -#endif /* PARANOID */ - - semops[0].sem_num = semnum; - semops[0].sem_op = 1; - semops[0].sem_flg = SEM_UNDO | - (timeout != SM_TIME_FOREVER ? 0 : IPC_NOWAIT); - if (timeout == SM_TIME_IMMEDIATE || timeout == SM_TIME_FOREVER) - return semop(semid, semops, 1); - do - { - r = semop(semid, semops, 1); - if (r == 0) - return r; - sleep(1); - --timeout; - } while (timeout > 0); - return r; -} - -/* -** SM_SEM_GET -- get semaphore value. -** -** Parameters: -** semid -- id for semaphores. -** semnum -- number of semaphore. -** -** Returns: -** value of semaphore on success. -** < 0 on failure. -*/ - -int -sm_sem_get(semid, semnum) - int semid; - int semnum; -{ - int semval; - - if ((semval = semctl(semid, semnum, GETVAL, NULL)) < 0) - return -1; - return semval; -} -#endif /* SM_CONF_SEM */ |