src/ipc/semtimedop.c

   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 }