semtimedop.c raw

   1  #define _GNU_SOURCE
   2  #include <sys/sem.h>
   3  #include <errno.h>
   4  #include "syscall.h"
   5  #include "ipc.h"
   6  
   7  #define IS32BIT(x) !((x)+0x80000000ULL>>32)
   8  #define CLAMP(x) (int)(IS32BIT(x) ? (x) : 0x7fffffffU+((0ULL+(x))>>63))
   9  
  10  #if !defined(SYS_semtimedop) && !defined(SYS_ipc)
  11  #define NO_TIME32 1
  12  #else
  13  #define NO_TIME32 0
  14  #endif
  15  
  16  int semtimedop(int id, struct sembuf *buf, size_t n, const struct timespec *ts)
  17  {
  18  #ifdef SYS_semtimedop_time64
  19  	time_t s = ts ? ts->tv_sec : 0;
  20  	long ns = ts ? ts->tv_nsec : 0;
  21  	int r = -ENOSYS;
  22  	if (NO_TIME32 || !IS32BIT(s))
  23  		r = __syscall(SYS_semtimedop_time64, id, buf, n,
  24  			ts ? ((long long[]){s, ns}) : 0);
  25  	if (NO_TIME32 || r!=-ENOSYS) return __syscall_ret(r);
  26  	ts = ts ? (void *)(long[]){CLAMP(s), ns} : 0;
  27  #endif
  28  #if defined(SYS_ipc)
  29  	return syscall(SYS_ipc, IPCOP_semtimedop, id, n, 0, buf, ts);
  30  #elif defined(SYS_semtimedop)
  31  	return syscall(SYS_semtimedop, id, buf, n, ts);
  32  #else
  33  	return __syscall_ret(-ENOSYS);
  34  #endif
  35  }
  36