lib/libc/gen/sysvipc_semctl.c

   1 #include <sys/types.h>
   2 #include <sys/ipc.h>
   3 #include <sys/sem.h>
   4 #include <stdarg.h>
   5
   6 #include "sysvipc_sem.h"
   7
   8 extern char sysvipc_userland;
   9 extern int __sys___semctl(int, int, int, union semun *);
  10
  11 int
  12 semctl(int semid, int semnum, int cmd, ...)
  13 {
  14         va_list ap;
  15         union semun semun = { 0 };
  16         union semun *semun_ptr = NULL;
  17
  18         va_start(ap, cmd);
  19         if (cmd == IPC_SET || cmd == IPC_STAT || cmd == GETALL
  20             || cmd == SETVAL || cmd == SETALL) {
  21                 semun = va_arg(ap, union semun);
  22                 semun_ptr = &semun;
  23         }
  24         va_end(ap);
  25
  26         if (sysvipc_userland)
  27                 return (sysvipc___semctl(semid, semnum, cmd, semun_ptr));
  28         return (__sys___semctl(semid, semnum, cmd, semun_ptr));
  29 }