minix/lib/nbsd_libc/sys-minix/shmctl.c

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#define _SYSTEM 1
#define _MINIX 1
#include <sys/cdefs.h>
#include <lib.h>
#include "namespace.h"
#include <minix/rs.h>
#include <lib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdlib.h>
#include <errno.h>
static int get_ipc_endpt(endpoint_t *pt)
{
return minix_rs_lookup("ipc", pt);
}
/* Shared memory control operation. */
int shmctl(int shmid, int cmd, struct shmid_ds *buf)
{
message m;
endpoint_t ipc_pt;
int r;
if (get_ipc_endpt(&ipc_pt) != OK) {
errno = ENOSYS;
return -1;
}
m.SHMCTL_ID = shmid;
m.SHMCTL_CMD = cmd;
m.SHMCTL_BUF = (long) buf;
r = _syscall(ipc_pt, IPC_SHMCTL, &m);
if ((cmd == IPC_INFO || cmd == SHM_INFO || cmd == SHM_STAT)
&& (r == OK))
return m.SHMCTL_RET;
return r;
}