IPC_RMID(9) Kernel IPC facilities IPC_RMID(9)NAME
ipc_rmid - remove an IPC identifier
SYNOPSIS
void ipc_rmid(struct ipc_ids * ids, struct kern_ipc_perm * ipcp);
ARGUMENTS
ids
IPC identifier set
ipcp
ipc perm structure containing the identifier to remove
DESCRIPTION
ipc_ids.rw_mutex (as a writer) and the spinlock for this ID are held before this function is called, and remain locked on the exit.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 IPC_RMID(9)
Check Out this Related Man Page
ipc.h(3HEAD) Headers ipc.h(3HEAD)NAME
ipc.h, ipc - XSI interprocess communication access structure
SYNOPSIS
#include <sys/ipc.h>
DESCRIPTION
The <sys/ipc.h> header is used by three mechanisms for interprocess communication (IPC): messages, semaphores, and shared memory. All use a
common structure type, ipc_perm, to pass information used in determining permission to perform an IPC operation.
The ipc_perm structure contains the following members:
uid_t uid /* owner's user ID */
gid_t gid /* owner's group ID */
uid_t cuid /* creator's user ID */
gid_t cgid /* creator's group ID */
mode_t mode /* read/write permission
The uid_t, gid_t, mode_t, and key_t types are defined as described in <sys/types.h>. See types.h(3HEAD).
Definitions are provided for the constants listed below.
Mode bits:
IPC_CREAT Create entry if key does not exist.
IPC_EXCL Fail if key exists.
IPC_NOWAIT Error if request must wait.
Keys:
IPC_PRIVATE Private key.
Control commands:
IPC_RMID Remove identifier.
IPC_SET Set options.
IPC_STAT Get options.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO ftok(3C), types.h(3HEAD), attributes(5), standards(5)SunOS 5.10 10 Sep 2004 ipc.h(3HEAD)
Hi
just doin' this here for the naval school, back here in Pportugal, and needed some help, especially with the shared memo i want to use for the 10 airport gate, and the maximum of 4 planes preparing to leave; canīt figure out how the gate can be id by the same PID. WELL, if someone wants to... (2 Replies)
I have what should be a relatively simple program (fadec.c) that maps a struct from an included header file (fadec.h) to a shared memory region, but I’m struggling accessing members in the struct from the pointer returned by shmat. Ultimately, I want to access members in the shared memory structure... (2 Replies)
Hi, I am trying to send/receive data by message queue and expecting it to be blocked on send/read for other side (at least this is my understooding ) , I am connecting message between perl<->C , perl is working as expected , but in C msgsnd and msgrcv are not waiting (blocked) untill second side... (6 Replies)
Hi,
I want to make 2 simple programs communicate each other with shared memory.
The programs will share an 2D array. In the first program (intarr.c) i create an x array which is:
1 2 3 4
5 6 7 8
9 10 11 12
and i call the second program (intarr2.c) with execvp(); giving it the segment id as an... (2 Replies)
Hi, this is my code.It's simple : there are 2 2D arrays and the multiplied to C.
#include<stdio.h>
#include<sys/shm.h>
#include<sys/stat.h>
#include<stdlib.h>
main()
{
int *A; //A
int *B; //B
int *C; //C
int i,j,x,k,d;
int id;
... (17 Replies)
i have to shared a variable between two different c programs with shared memory and i do these:
int main() {
int a=5,b=7;
int buffer;
int *point;
int shmid;
shmid=shmget(IPC_PRIVATE , sizeof(buffer),0666);
point=(int *)shmat(shmid,NULL,0);
point=a;
... (21 Replies)
how can i send an integer via message queue?
i try this, but it doesn't work, child process receive 13345943 instead of 5
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/msg.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <errno.h>
#include <unistd.h>... (2 Replies)
Hi friends,
This is a small program built on the concept of shared memory. The producer is a separate program and process, and the consumer is a seperate program and process. Both are executed under the same user account. The producer takes some string from the user and adds that string to the... (1 Reply)