github.com/afumu/libc@v0.0.6/musl/src/ipc/semtimedop.c (about)

     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  }