libc-top-half/musl/src/ipc/shmctl.c

   1 #include <sys/shm.h>
   2 #include <endian.h>
   3 #include "syscall.h"
   4 #include "ipc.h"
   5
   6 #if __BYTE_ORDER != __BIG_ENDIAN
   7 #undef SYSCALL_IPC_BROKEN_MODE
   8 #endif
   9
  10 int shmctl(int id, int cmd, struct shmid_ds *buf)
  11 {
  12 #ifdef SYSCALL_IPC_BROKEN_MODE
  13         struct shmid_ds tmp;
  14         if (cmd == IPC_SET) {
  15                 tmp = *buf;
  16                 tmp.shm_perm.mode *= 0x10000U;
  17                 buf = &tmp;
  18         }
  19 #endif
  20 #ifndef SYS_ipc
  21         int r = __syscall(SYS_shmctl, id, cmd | IPC_64, buf);
  22 #else
  23         int r = __syscall(SYS_ipc, IPCOP_shmctl, id, cmd | IPC_64, 0, buf, 0);
  24 #endif
  25 #ifdef SYSCALL_IPC_BROKEN_MODE
  26         if (r >= 0) switch (cmd) {
  27         case IPC_STAT:
  28         case SHM_STAT:
  29         case SHM_STAT_ANY:
  30                 buf->shm_perm.mode >>= 16;
  31         }
  32 #endif
  33         return __syscall_ret(r);
  34 }