projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 6d2010ae A |
1 | .\" $Darwin$ |
| 2 | .\" | |
| 3 | .\" Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. | |
| 4 | .\" | |
| 5 | .\" @APPLE_LICENSE_HEADER_START@ | |
| 6 | .\" | |
| 7 | .\" The contents of this file constitute Original Code as defined in and | |
| 8 | .\" are subject to the Apple Public Source License Version 1.1 (the | |
| 9 | .\" "License"). You may not use this file except in compliance with the | |
| 10 | .\" License. Please obtain a copy of the License at | |
| 11 | .\" http://www.apple.com/publicsource and read it before using this file. | |
| 12 | .\" | |
| 13 | .\" This Original Code and all software distributed under the License are | |
| 14 | .\" distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 15 | .\" EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 16 | .\" INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 17 | .\" FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the | |
| 18 | .\" License for the specific language governing rights and limitations | |
| 19 | .\" under the License. | |
| 20 | .\" | |
| 21 | .\" @APPLE_LICENSE_HEADER_END@ | |
| 22 | .\" | |
| 23 | .Dd June 8, 2000 | |
| 24 | .Dt SEM_UNLINK 2 | |
| 25 | .Os Darwin | |
| 26 | .Sh NAME | |
| 27 | .Nm sem_unlink | |
| 28 | .Nd remove a named semaphore | |
| 29 | .Sh SYNOPSIS | |
| 30 | .Fd #include <semaphore.h> | |
| 31 | .Ft int | |
| 32 | .Fn sem_unlink "const char *name" | |
| 33 | .Sh DESCRIPTION | |
| 34 | The named semaphore named | |
| 35 | .Fa name | |
| 36 | is removed. If the semaphore is in use by other processes, then | |
| 37 | .Fa name | |
| 38 | is immediately disassociated with the semaphore, but the semaphore | |
| 39 | itself will not be removed until all references to it have been | |
| 40 | closed. Subsequent calls to | |
| 41 | .Fn sem_open | |
| 42 | using | |
| 43 | .Fa name | |
| 44 | will refer to or create a new semaphore named | |
| 45 | .Fa name . | |
| 46 | .Pp | |
| 47 | If successful, | |
| 48 | .Fn sem_unlink | |
| 49 | will return 0. Otherwise, -1 is returned and | |
| 50 | .Va errno | |
| 51 | is set, and the state of the semaphore is unchanged. | |
| 52 | .Sh ERRORS | |
| 53 | .Fn sem_unlink | |
| 54 | succeeds unless: | |
| 55 | .Bl -tag -width Er | |
| 56 | .It Bq Er EACCES | |
| 57 | Permission is denied to be remove the semaphore. | |
| 58 | .It Bq Er ENAMETOOLONG | |
| 59 | .Fa name | |
| 60 | exceeded | |
| 3e170ce0 | 61 | .Dv PSEMNAMLEN |
| 6d2010ae A |
62 | characters. |
| 63 | .It Bq Er ENOENT | |
| 64 | The named semaphore does not exist. | |
| 65 | .El | |
| 66 | .Sh SEE ALSO | |
| 67 | .Xr sem_close 2 , | |
| 68 | .Xr sem_open 2 , | |
| 69 | .Xr semctl 2 , | |
| 70 | .Xr semget 2 , | |
| 71 | .Xr semop 2 | |
| 72 | .Sh HISTORY | |
| 73 | .Fn sem_unlink | |
| 74 | is specified in the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995). |