lib/libc/sys-minix/shmget.c

   1 #define _SYSTEM 1
   2 #define _MINIX 1
   3 #include <sys/cdefs.h>
   4 #include <lib.h>
   5 #include "namespace.h"
   6
   7 #include <minix/rs.h>
   8 #include <sys/types.h>
   9 #include <sys/ipc.h>
  10 #include <sys/shm.h>
  11 #include <stdlib.h>
  12 #include <errno.h>
  13
  14
  15 #ifdef __weak_alias
  16 __weak_alias(shmget, _shmget)
  17 #endif
  18
  19 static int get_ipc_endpt(endpoint_t *pt)
  20 {
  21         return minix_rs_lookup("ipc", pt);
  22 }
  23
  24 /* Get shared memory segment. */
  25 int shmget(key_t key, size_t size, int shmflg)
  26 {
  27         message m;
  28         endpoint_t ipc_pt;
  29         int r;
  30
  31         if (get_ipc_endpt(&ipc_pt) != OK) {
  32                 errno = ENOSYS;
  33                 return -1;
  34         }
  35
  36         m.SHMGET_KEY = key;
  37         m.SHMGET_SIZE = size;
  38         m.SHMGET_FLAG = shmflg;
  39
  40         r = _syscall(ipc_pt, IPC_SHMGET, &m);
  41         if (r != OK)
  42                 return r;
  43         return m.SHMGET_RETID;
  44 }