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30 .Dd September 27, 2012
34 .Nm sigtimedwait , sigwaitinfo
35 .Nd "wait for queued signals (REALTIME)"
42 .Fa "const sigset_t *restrict set" "siginfo_t *restrict info"
43 .Fa "const struct timespec *restrict timeout"
46 .Fn sigwaitinfo "const sigset_t * restrict set" "siginfo_t * restrict info"
50 system call is equivalent to
52 except that if none of the signals specified by
56 waits for the time interval specified in the
58 structure referenced by
62 structure pointed to by
64 is zero-valued and if none of the signals specified by
68 returns immediately with an error.
73 pointer, the behavior is unspecified.
75 clock is used to measure the time interval specified by the
81 system call selects the pending signal from the set specified by
83 Should any of multiple pending signals in the range
87 be selected, it shall be the lowest numbered one.
89 selection order between realtime and non-realtime signals, or
90 between multiple pending non-realtime signals, is unspecified.
93 is pending at the time of the call, the calling thread
94 is suspended until one or more signals in
96 become pending or until it is interrupted by an unblocked, caught signal.
100 system call is equivalent to the
112 function is equivalent to
114 except that the selected signal number shall be stored in the
116 member, and the cause of the signal shall be stored in the
123 system calls may return
125 if interrupted by signal, which is not allowed for the
129 If any value is queued to the selected signal, the first such queued
130 value is dequeued and, if the info argument is
132 the value is stored in the
136 The system resource used to queue the signal
137 is released and returned to the system for other use.
138 If no value is queued,
141 member is zero-valued.
142 If no further signals are
143 queued for the selected signal, the pending indication for that signal
146 Upon successful completion (that is, one of the signals specified by
148 is pending or is generated)
152 return the selected signal number.
153 Otherwise, the functions return a value of \-1
154 and set the global variable
156 to indicate the error.
164 No signal specified by set was generated within the specified timeout period.
171 system calls fail if:
174 The wait was interrupted by an unblocked, caught signal.
179 system call may also fail if:
186 value less than zero or greater than or equal
188 Kernel only checks for this error if no signal is pending in set and it
189 is necessary to wait.
198 .Xr pthread_sigmask 3 ,
205 system calls conform to