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head/lib/libc/sys/shmctl.2
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| .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||||
| .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||||
| .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||||
| .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | ||||
| .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||||
| .\" | .\" | ||||
| .\" $FreeBSD$ | .\" $FreeBSD$ | ||||
| .\" | .\" | ||||
| .Dd July 17, 1995 | .Dd October 10, 2015 | ||||
| .Dt SHMCTL 2 | .Dt SHMCTL 2 | ||||
| .Os | .Os | ||||
| .Sh NAME | .Sh NAME | ||||
| .Nm shmctl | .Nm shmctl | ||||
| .Nd shared memory control | .Nd shared memory control | ||||
| .Sh LIBRARY | .Sh LIBRARY | ||||
| .Lb libc | .Lb libc | ||||
| .Sh SYNOPSIS | .Sh SYNOPSIS | ||||
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| match either | match either | ||||
| .Fa shm_perm.uid | .Fa shm_perm.uid | ||||
| or | or | ||||
| .Fa shm_perm.cuid , | .Fa shm_perm.cuid , | ||||
| or it must have superuser privileges. | or it must have superuser privileges. | ||||
| .It Dv IPC_RMID | .It Dv IPC_RMID | ||||
| Removes the segment from the system. | Removes the segment from the system. | ||||
| The removal will not take | The removal will not take | ||||
| effect until all processes having attached the segment have exited; | effect until all processes having attached the segment have exited. | ||||
| however, once the IPC_RMID operation has taken place, no further | |||||
| processes will be allowed to attach the segment. | |||||
| For the operation | For the operation | ||||
| to succeed, the calling process's effective uid must match | to succeed, the calling process's effective uid must match | ||||
| .Fa shm_perm.uid | .Fa shm_perm.uid | ||||
| or | or | ||||
| .Fa shm_perm.cuid , | .Fa shm_perm.cuid , | ||||
| or the process must have superuser privileges. | 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 | .\" .It Dv SHM_LOCK | ||||
| .\" Locks the segment in memory. The calling process must have | .\" Locks the segment in memory. The calling process must have | ||||
| .\" superuser privileges. Not implemented in FreeBSD. | .\" superuser privileges. Not implemented in FreeBSD. | ||||
| .\" .It Dv SHM_UNLOCK | .\" .It Dv SHM_UNLOCK | ||||
| .\" Unlocks the segment from memory. The calling process must | .\" Unlocks the segment from memory. The calling process must | ||||
| .\" have superuser privileges. Not implemented in FreeBSD. | .\" have superuser privileges. Not implemented in FreeBSD. | ||||
| .El | .El | ||||
| .Pp | .Pp | ||||
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