lib/libc/sys-minix/shmctl.c

   1 #define _SYSTEM 1
   2 #define _MINIX 1
   3
   4 #include <sys/cdefs.h>
   5 #include <lib.h>
   6 #include "namespace.h"
   7
   8 #include <minix/rs.h>
   9 #include <lib.h>
  10 #include <sys/types.h>
  11 #include <sys/ipc.h>
  12 #include <sys/shm.h>
  13 #include <stdlib.h>
  14 #include <errno.h>
  15
  16 static int get_ipc_endpt(endpoint_t *pt)
  17 {
  18         return minix_rs_lookup("ipc", pt);
  19 }
  20
  21 /* Shared memory control operation. */
  22 int shmctl(int shmid, int cmd, struct shmid_ds *buf)
  23 {
  24         message m;
  25         endpoint_t ipc_pt;
  26         int r;
  27
  28         if (get_ipc_endpt(&ipc_pt) != OK) {
  29                 errno = ENOSYS;
  30                 return -1;
  31         }
  32
  33         m.SHMCTL_ID = shmid;
  34         m.SHMCTL_CMD = cmd;
  35         m.SHMCTL_BUF = (long) buf;
  36
  37         r = _syscall(ipc_pt, IPC_SHMCTL, &m);
  38         if ((cmd == IPC_INFO || cmd == SHM_INFO || cmd == SHM_STAT)
  39                 && (r == OK))
  40                 return m.SHMCTL_RET;
  41         return r;
  42 }