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timerfd: add time64 syscall support, decouple 32-bit time_t

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the changes here are semantically and structurally identical to those
made to timer_settime and timer_gettime for time64 support.
This commit is contained in:
Rich Felker 2019-07-28 23:53:38 -04:00
parent 1d4471b1fd
commit 89c5016cba
1 changed files with 42 additions and 0 deletions
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42
src/linux/timerfd.c
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@ -1,6 +1,9 @@
#include <sys/timerfd.h>
#include <errno.h>
#include "syscall.h"
#define IS32BIT(x) !((x)+0x80000000ULL>>32)
int timerfd_create(int clockid, int flags)
{
return syscall(SYS_timerfd_create, clockid, flags);
@ -8,10 +11,49 @@ int timerfd_create(int clockid, int flags)
int timerfd_settime(int fd, int flags, const struct itimerspec *new, struct itimerspec *old)
{
#ifdef SYS_timerfd_settime64
time_t is = new->it_interval.tv_sec, vs = new->it_value.tv_sec;
long ins = new->it_interval.tv_nsec, vns = new->it_value.tv_nsec;
int r = -ENOSYS;
if (SYS_timerfd_settime == SYS_timerfd_settime64
|| !IS32BIT(is) || !IS32BIT(vs) || (sizeof(time_t)>4 && old))
r = __syscall(SYS_timerfd_settime64, fd, flags,
((long long[]){is, ins, vs, vns}), old);
if (SYS_timerfd_settime == SYS_timerfd_settime64 || r!=-ENOSYS)
return __syscall_ret(r);
if (!IS32BIT(is) || !IS32BIT(vs))
return __syscall_ret(-ENOTSUP);
long old32[4];
r = __syscall(SYS_timerfd_settime, fd, flags,
((long[]){is, ins, vs, vns}), old32);
if (!r && old) {
old->it_interval.tv_sec = old32[0];
old->it_interval.tv_nsec = old32[1];
old->it_value.tv_sec = old32[2];
old->it_value.tv_nsec = old32[3];
}
return __syscall_ret(r);
#endif
return syscall(SYS_timerfd_settime, fd, flags, new, old);
}
int timerfd_gettime(int fd, struct itimerspec *cur)
{
#ifdef SYS_timerfd_gettime64
int r = -ENOSYS;
if (sizeof(time_t) > 4)
r = __syscall(SYS_timerfd_gettime64, fd, cur);
if (SYS_timerfd_gettime == SYS_timerfd_gettime64 || r!=-ENOSYS)
return __syscall_ret(r);
long cur32[4];
r = __syscall(SYS_timerfd_gettime, fd, cur32);
if (!r) {
cur->it_interval.tv_sec = cur32[0];
cur->it_interval.tv_nsec = cur32[1];
cur->it_value.tv_sec = cur32[2];
cur->it_value.tv_nsec = cur32[3];
}
return __syscall_ret(r);
#endif
return syscall(SYS_timerfd_gettime, fd, cur);
}