diff options
Diffstat (limited to 'lib/libc/sys/shmctl.2')
| -rw-r--r-- | lib/libc/sys/shmctl.2 | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/lib/libc/sys/shmctl.2 b/lib/libc/sys/shmctl.2 deleted file mode 100644 index 788e79f1900d..000000000000 --- a/lib/libc/sys/shmctl.2 +++ /dev/null @@ -1,141 +0,0 @@ -.\" -.\" Copyright (c) 1995 David Hovemeyer <daveho@infocom.com> -.\" -.\" All rights reserved. -.\" -.\" Redistribution and use in source and binary forms, with or without -.\" modification, are permitted provided that the following conditions -.\" are met: -.\" 1. Redistributions of source code must retain the above copyright -.\" notice, this list of conditions and the following disclaimer. -.\" 2. Redistributions in binary form must reproduce the above copyright -.\" notice, this list of conditions and the following disclaimer in the -.\" documentation and/or other materials provided with the distribution. -.\" -.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR -.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES -.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. -.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, -.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT -.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF -.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -.\" -.\" $FreeBSD$ -.\" -.Dd October 10, 2015 -.Dt SHMCTL 2 -.Os -.Sh NAME -.Nm shmctl -.Nd shared memory control -.Sh LIBRARY -.Lb libc -.Sh SYNOPSIS -.In sys/types.h -.In sys/ipc.h -.In sys/shm.h -.Ft int -.Fn shmctl "int shmid" "int cmd" "struct shmid_ds *buf" -.Sh DESCRIPTION -Performs the action specified by -.Fa cmd -on the shared memory segment identified by -.Fa shmid : -.Bl -tag -width SHM_UNLOCKX -.It Dv IPC_STAT -Fetch the segment's -.Fa "struct shmid_ds" , -storing it in the memory pointed to by -.Fa buf . -.\" -.\" XXX need to make sure that this is correct for FreeBSD -.\" -.It Dv IPC_SET -Changes the -.Fa shm_perm.uid , -.Fa shm_perm.gid , -and -.Fa shm_perm.mode -members of the segment's -.Fa "struct shmid_ds" -to match those of the struct pointed to by -.Fa buf . -The calling process's effective uid must -match either -.Fa shm_perm.uid -or -.Fa shm_perm.cuid , -or it must have superuser privileges. -.It Dv IPC_RMID -Removes the segment from the system. -The removal will not take -effect until all processes having attached the segment have exited. -For the operation -to succeed, the calling process's effective uid must match -.Fa shm_perm.uid -or -.Fa shm_perm.cuid , -or the process must have superuser privileges. -If the -.Va kern.ipc.shm_allow_removed -.Xr sysctl 3 -variable is set to 0, once the IPC_RMID operation has taken place, -no further processes will be allowed to attach the segment. -.\" .It Dv SHM_LOCK -.\" Locks the segment in memory. The calling process must have -.\" superuser privileges. Not implemented in FreeBSD. -.\" .It Dv SHM_UNLOCK -.\" Unlocks the segment from memory. The calling process must -.\" have superuser privileges. Not implemented in FreeBSD. -.El -.Pp -The -.Vt shmid_ds -structure is defined as follows: -.\" -.\" I fiddled with the spaces a bit to make it fit well when viewed -.\" with nroff, but otherwise it is straight from sys/shm.h -.\" -.Bd -literal -struct shmid_ds { - struct ipc_perm shm_perm; /* operation permission structure */ - size_t shm_segsz; /* size of segment in bytes */ - pid_t shm_lpid; /* process ID of last shared memory op */ - pid_t shm_cpid; /* process ID of creator */ - int shm_nattch; /* number of current attaches */ - time_t shm_atime; /* time of last shmat() */ - time_t shm_dtime; /* time of last shmdt() */ - time_t shm_ctime; /* time of last change by shmctl() */ -}; -.Ed -.Sh RETURN VALUES -.Rv -std shmctl -.Sh ERRORS -The -.Fn shmctl -system call -will fail if: -.Bl -tag -width Er -.It Bq Er EINVAL -Invalid operation, or -no shared memory segment was found corresponding to -.Fa shmid . -.\" -.\" XXX I think the following is right: ipcperm() only returns EPERM -.\" when an attempt is made to modify (IPC_M) by a non-creator -.\" non-owner -.It Bq Er EPERM -The calling process's effective uid does not match the uid of -the shared memory segment's owner or creator. -.It Bq Er EACCES -Permission denied due to mismatch between operation and mode of -shared memory segment. -.El -.Sh "SEE ALSO" -.Xr shmat 2 , -.Xr shmdt 2 , -.Xr shmget 2 , -.Xr ftok 3 |