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35 .Nd "create a per-process timer (REALTIME)"
43 .Fa "clockid_t clockid" "struct sigevent *restrict evp"
44 .Fa "timer_t *restrict timerid"
49 system call creates a per-process timer using the specified clock,
54 system call returns, in the location referenced by
58 used to identify the timer in timer requests.
59 This timer ID is unique within the calling process until the timer is deleted.
64 The timer whose ID is returned is in a disarmed state upon return from
75 allocated by the application, defines the asynchronous notification to occur
76 when the timer expires.
81 the effect is as if the
87 member having the value
91 having a default signal number, and the
94 the value of the timer ID.
96 The implementations supports a
101 .Dv CLOCK_MONOTONIC .
104 .Fa evp->sigev_notify
108 .Fa sev->sigev_notify_attributes
111 if the attribute pointed to by
112 .Fa sev->sigev_notify_attributes
114 a thread stack address specified by a call to
115 .Fn pthread_attr_setstack
117 .Fn pthread_attr_setstackaddr ,
118 the results are unspecified if the signal is generated more than once.
120 If the call succeeds,
122 returns zero and updates the location referenced by
126 which can be passed to the per-process timer calls.
128 occurs, the system call returns a value of \-1
129 and the global variable
131 is set to indicate the
135 is undefined if an error occurs.
143 The calling process has already created all of the timers it is allowed by
146 The specified clock ID is not supported.
148 Any arguments point outside the allocated address space or there is a
149 memory protection fault.
154 .Xr timer_getoverun 2 ,
159 system call conforms to
164 per-process timer first appeared in