| shmget.2 (109831) | shmget.2 (131504) |
|---|---|
| 1.\" 2.\" Copyright (c) 1995 David Hovemeyer <daveho@infocom.com> 3.\" 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: --- 9 unchanged lines hidden (view full) --- 18.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" | 1.\" 2.\" Copyright (c) 1995 David Hovemeyer <daveho@infocom.com> 3.\" 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: --- 9 unchanged lines hidden (view full) --- 18.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" |
| 26.\" $FreeBSD: head/lib/libc/sys/shmget.2 109831 2003-01-25 21:33:05Z alfred $ | 26.\" $FreeBSD: head/lib/libc/sys/shmget.2 131504 2004-07-02 23:52:20Z ru $ |
| 27.\" 28.Dd July 3, 1995 29.Dt SHMGET 2 30.Os 31.Sh NAME 32.Nm shmget 33.Nd obtain a shared memory identifier 34.Sh LIBRARY --- 14 unchanged lines hidden (view full) --- 49returns the identifier of a newly created or previously existing shared 50memory segment. 51.\" 52.\" The following bit about keys and modes also applies to semaphores 53.\" and message queues. 54.\" 55The key 56is analogous to a filename: it provides a handle that names an | 27.\" 28.Dd July 3, 1995 29.Dt SHMGET 2 30.Os 31.Sh NAME 32.Nm shmget 33.Nd obtain a shared memory identifier 34.Sh LIBRARY --- 14 unchanged lines hidden (view full) --- 49returns the identifier of a newly created or previously existing shared 50memory segment. 51.\" 52.\" The following bit about keys and modes also applies to semaphores 53.\" and message queues. 54.\" 55The key 56is analogous to a filename: it provides a handle that names an |
| 57IPC object. There are three ways to specify a key: | 57IPC object. 58There are three ways to specify a key: |
| 58.Bl -bullet 59.It 60IPC_PRIVATE may be specified, in which case a new IPC object 61will be created. 62.It | 59.Bl -bullet 60.It 61IPC_PRIVATE may be specified, in which case a new IPC object 62will be created. 63.It |
| 63An integer constant may be specified. If no IPC object corresponding | 64An integer constant may be specified. 65If no IPC object corresponding |
| 64to 65.Fa key 66is specified and the IPC_CREAT bit is set in 67.Fa flag , 68a new one will be created. 69.It 70The 71.Xr ftok 3 --- 23 unchanged lines hidden (view full) --- 95.\" XXX - we should also mention how uid, euid, and gid affect ownership 96.\" and use 97.\" 98.\" end section about keys and modes 99.\" 100.Pp 101When creating a new shared memory segment, 102.Fa size | 66to 67.Fa key 68is specified and the IPC_CREAT bit is set in 69.Fa flag , 70a new one will be created. 71.It 72The 73.Xr ftok 3 --- 23 unchanged lines hidden (view full) --- 97.\" XXX - we should also mention how uid, euid, and gid affect ownership 98.\" and use 99.\" 100.\" end section about keys and modes 101.\" 102.Pp 103When creating a new shared memory segment, 104.Fa size |
| 103indicates the desired size of the new segment in bytes. The size | 105indicates the desired size of the new segment in bytes. 106The size |
| 104of the segment may be rounded up to a multiple convenient to the 105kernel (i.e., the page size). 106.Sh RETURN VALUES 107Upon successful completion, 108.Fn shmget 109returns the positive integer identifier of a shared memory segment. 110Otherwise, -1 is returned and 111.Va errno --- 32 unchanged lines hidden --- | 107of the segment may be rounded up to a multiple convenient to the 108kernel (i.e., the page size). 109.Sh RETURN VALUES 110Upon successful completion, 111.Fn shmget 112returns the positive integer identifier of a shared memory segment. 113Otherwise, -1 is returned and 114.Va errno --- 32 unchanged lines hidden --- |