2 * timer_create.c - create a per-process timer.
11 #include <sys/syscall.h>
13 #include "kernel-posix-timers.h"
15 #ifdef __NR_timer_create
17 #define __NR___syscall_timer_create __NR_timer_create
18 static __inline__ _syscall3(int, __syscall_timer_create, clockid_t, clock_id,
19 struct sigevent *, evp, kernel_timer_t *, ktimerid);
21 /* Create a per-process timer */
22 int timer_create(clockid_t clock_id, struct sigevent *evp, timer_t * timerid)
25 kernel_timer_t ktimerid;
26 struct sigevent default_evp;
31 * The kernel has to pass up the timer ID which is a userlevel object.
32 * Therefore we cannot leave it up to the kernel to determine it.
34 default_evp.sigev_notify = SIGEV_SIGNAL;
35 default_evp.sigev_signo = SIGALRM;
39 /* Notification via a thread is not supported yet */
40 if (__builtin_expect(evp->sigev_notify == SIGEV_THREAD, 1))
44 * We avoid allocating too much memory by basically using
45 * struct timer as a derived class with the first two elements
46 * being in the superclass. We only need these two elements here.
48 newp = malloc(offsetof(struct timer, thrfunc));
50 return -1; /* No memory */
51 default_evp.sigev_value.sival_ptr = newp;
53 retval = __syscall_timer_create(clock_id, evp, &ktimerid);
55 newp->sigev_notify = evp->sigev_notify;
56 newp->ktimerid = ktimerid;
58 *timerid = (timer_t) newp;
60 /* Cannot allocate the timer, fail */