github.com/afumu/libc@v0.0.6/musl/src/mq/mq_timedsend.c (about)

     1  #include <mqueue.h>
     2  #include <errno.h>
     3  #include "syscall.h"
     4  
     5  #define IS32BIT(x) !((x)+0x80000000ULL>>32)
     6  #define CLAMP(x) (int)(IS32BIT(x) ? (x) : 0x7fffffffU+((0ULL+(x))>>63))
     7  
     8  int mq_timedsend(mqd_t mqd, const char *msg, size_t len, unsigned prio, const struct timespec *at)
     9  {
    10  #ifdef SYS_mq_timedsend_time64
    11  	time_t s = at ? at->tv_sec : 0;
    12  	long ns = at ? at->tv_nsec : 0;
    13  	long r = -ENOSYS;
    14  	if (SYS_mq_timedsend == SYS_mq_timedsend_time64 || !IS32BIT(s))
    15  		r = __syscall_cp(SYS_mq_timedsend_time64, mqd, msg, len, prio,
    16  			at ? ((long long []){at->tv_sec, at->tv_nsec}) : 0);
    17  	if (SYS_mq_timedsend == SYS_mq_timedsend_time64 || r != -ENOSYS)
    18  		return __syscall_ret(r);
    19  	return syscall_cp(SYS_mq_timedsend, mqd, msg, len, prio,
    20  		at ? ((long[]){CLAMP(s), ns}) : 0);
    21  #else
    22  	return syscall_cp(SYS_mq_timedsend, mqd, msg, len, prio, at);
    23  #endif
    24  }