minix/lib/libc/sys/shmget.c

   1 #define _SYSTEM 1
   2
   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 #include <string.h>
  14
  15 static int get_ipc_endpt(endpoint_t *pt)
  16 {
  17         return minix_rs_lookup("ipc", pt);
  18 }
  19
  20 /* Get shared memory segment. */
  21 int shmget(key_t key, size_t size, int shmflg)
  22 {
  23         message m;
  24         endpoint_t ipc_pt;
  25         int r;
  26
  27         if (get_ipc_endpt(&ipc_pt) != OK) {
  28                 errno = ENOSYS;
  29                 return -1;
  30         }
  31
  32         memset(&m, 0, sizeof(m));
  33         m.m_lc_ipc_shmget.key = key;
  34         m.m_lc_ipc_shmget.size = size;
  35         m.m_lc_ipc_shmget.flag = shmflg;
  36
  37         r = _syscall(ipc_pt, IPC_SHMGET, &m);
  38         if (r != OK)
  39                 return r;
  40         return m.m_lc_ipc_shmget.retid;
  41 }