1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 #pragma weak semctl = _semctl 34 #pragma weak semctl64 = _semctl64 35 #pragma weak semget = _semget 36 #pragma weak semop = _semop 37 #pragma weak semids = _semids 38 #pragma weak semtimedop = _semtimedop 39 40 #include "synonyms.h" 41 #include <sys/types.h> 42 #include <sys/ipc.h> 43 #include <sys/ipc_impl.h> 44 #include <sys/sem.h> 45 #include <sys/sem_impl.h> 46 #include <sys/syscall.h> 47 #include <stdarg.h> 48 #include <errno.h> 49 50 union semun { 51 int val; 52 struct semid_ds *buf; 53 struct semid_ds64 *buf64; 54 ushort_t *array; 55 }; 56 57 /* 58 * The kernel implementation of semsys expects an argument containing the 59 * value of the semun argument, but the Sparc compiler passes a pointer 60 * to it, since it is a union. So, we convert here and pass the value, 61 * but to keep the naive user from being penalized for the counterintuitive 62 * behaviour of the Sparc compiler, we ignore the union if it will not be 63 * used by the system call (to protect the caller from SIGSEGVs, e.g. 64 * semctl(semid, semnum, cmd, NULL); which would otherwise always result 65 * in a segmentation violation). We do this partly for consistency, since 66 * the ICL port did it. This all works just fine for the Intel compiler, 67 * which actually does pass the union by value. 68 */ 69 int 70 semctl(int semid, int semnum, int cmd, ...) 71 { 72 uintptr_t arg; 73 va_list ap; 74 75 switch (cmd) { 76 case SETVAL: 77 va_start(ap, cmd); 78 arg = (uintptr_t)va_arg(ap, union semun).val; 79 va_end(ap); 80 break; 81 case GETALL: 82 case SETALL: 83 va_start(ap, cmd); 84 arg = (uintptr_t)va_arg(ap, union semun).array; 85 va_end(ap); 86 break; 87 case IPC_STAT: 88 case IPC_SET: 89 va_start(ap, cmd); 90 arg = (uintptr_t)va_arg(ap, union semun).buf; 91 va_end(ap); 92 break; 93 case IPC_SET64: 94 case IPC_STAT64: 95 (void) __set_errno(EINVAL); 96 return (-1); 97 default: 98 arg = 0; 99 break; 100 } 101 102 return (syscall(SYS_semsys, SEMCTL, semid, semnum, cmd, arg)); 103 } 104 105 int 106 semctl64(int semid, int semnum, int cmd, ...) 107 { 108 struct semid_ds64 *buf; 109 va_list ap; 110 111 if (cmd != IPC_SET64 && cmd != IPC_STAT64) { 112 (void) __set_errno(EINVAL); 113 return (-1); 114 } 115 116 va_start(ap, cmd); 117 buf = va_arg(ap, union semun).buf64; 118 va_end(ap); 119 120 return (syscall(SYS_semsys, SEMCTL, semid, semnum, cmd, buf)); 121 } 122 123 int 124 semget(key_t key, int nsems, int semflg) 125 { 126 return (syscall(SYS_semsys, SEMGET, key, nsems, semflg)); 127 } 128 129 int 130 semop(int semid, struct sembuf *sops, size_t nsops) 131 { 132 return (syscall(SYS_semsys, SEMOP, semid, sops, nsops)); 133 } 134 135 int 136 semids(int *buf, uint_t nids, uint_t *pnids) 137 { 138 return (syscall(SYS_semsys, SEMIDS, buf, nids, pnids)); 139 } 140 141 int 142 semtimedop(int semid, struct sembuf *sops, size_t nsops, 143 const timespec_t *timeout) 144 { 145 return (syscall(SYS_semsys, SEMTIMEDOP, semid, sops, nsops, 146 timeout)); 147 } 148