github.com/afumu/libc@v0.0.6/musl/src/linux/timerfd.c (about)

     1  #include <sys/timerfd.h>
     2  #include <errno.h>
     3  #include "syscall.h"
     4  
     5  #define IS32BIT(x) !((x)+0x80000000ULL>>32)
     6  
     7  int timerfd_create(int clockid, int flags)
     8  {
     9  	return syscall(SYS_timerfd_create, clockid, flags);
    10  }
    11  
    12  int timerfd_settime(int fd, int flags, const struct itimerspec *new, struct itimerspec *old)
    13  {
    14  #ifdef SYS_timerfd_settime64
    15  	time_t is = new->it_interval.tv_sec, vs = new->it_value.tv_sec;
    16  	long ins = new->it_interval.tv_nsec, vns = new->it_value.tv_nsec;
    17  	int r = -ENOSYS;
    18  	if (SYS_timerfd_settime == SYS_timerfd_settime64
    19  	    || !IS32BIT(is) || !IS32BIT(vs) || (sizeof(time_t)>4 && old))
    20  		r = __syscall(SYS_timerfd_settime64, fd, flags,
    21  			((long long[]){is, ins, vs, vns}), old);
    22  	if (SYS_timerfd_settime == SYS_timerfd_settime64 || r!=-ENOSYS)
    23  		return __syscall_ret(r);
    24  	if (!IS32BIT(is) || !IS32BIT(vs))
    25  		return __syscall_ret(-ENOTSUP);
    26  	long old32[4];
    27  	r = __syscall(SYS_timerfd_settime, fd, flags,
    28  		((long[]){is, ins, vs, vns}), old32);
    29  	if (!r && old) {
    30  		old->it_interval.tv_sec = old32[0];
    31  		old->it_interval.tv_nsec = old32[1];
    32  		old->it_value.tv_sec = old32[2];
    33  		old->it_value.tv_nsec = old32[3];
    34  	}
    35  	return __syscall_ret(r);
    36  #endif
    37  	return syscall(SYS_timerfd_settime, fd, flags, new, old);
    38  }
    39  
    40  int timerfd_gettime(int fd, struct itimerspec *cur)
    41  {
    42  #ifdef SYS_timerfd_gettime64
    43  	int r = -ENOSYS;
    44  	if (sizeof(time_t) > 4)
    45  		r = __syscall(SYS_timerfd_gettime64, fd, cur);
    46  	if (SYS_timerfd_gettime == SYS_timerfd_gettime64 || r!=-ENOSYS)
    47  		return __syscall_ret(r);
    48  	long cur32[4];
    49  	r = __syscall(SYS_timerfd_gettime, fd, cur32);
    50  	if (!r) {
    51  		cur->it_interval.tv_sec = cur32[0];
    52  		cur->it_interval.tv_nsec = cur32[1];
    53  		cur->it_value.tv_sec = cur32[2];
    54  		cur->it_value.tv_nsec = cur32[3];
    55  	}
    56  	return __syscall_ret(r);
    57  #endif
    58  	return syscall(SYS_timerfd_gettime, fd, cur);
    59  }