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#include <signal.h>
The sigwaitinfo() system call selects the pending signal from the set specified by set. Should any of multiple pending signals in the range SIGRTMIN to SIGRTMAX be selected, it shall be the lowest numbered one. The selection order between realtime and non-realtime signals, or between multiple pending non-realtime signals, is unspecified. If no signal in set is pending at the time of the call, the calling thread is suspended until one or more signals in set become pending or until it is interrupted by an unblocked, caught signal.
The sigwaitinfo() system call is equivalent to the sigwait() system call if the info argument is NULL. If the info argument is non- NULL, the sigwaitinfo() function is equivalent to sigwait(), except that the selected signal number shall be stored in the si_signo member, and the cause of the signal shall be stored in the si_code member. Besides this, the sigwaitinfo() and sigtimedwait() system calls may return EINTR if interrupted by signal, which is not allowed for the sigwait() function.
If any value is queued to the selected signal, the first such queued value is dequeued and, if the info argument is non- NULL, the value is stored in the si_value member of info. The system resource used to queue the signal is released and returned to the system for other use. If no value is queued, the content of the si_value member is zero-valued. If no further signals are queued for the selected signal, the pending indication for that signal is reset.
[EAGAIN] | |
No signal specified by set was generated within the specified timeout period. | |
The sigtimedwait() and sigwaitinfo() system calls fail if:
[EINTR] | |
The wait was interrupted by an unblocked, caught signal. | |
The sigtimedwait() system call may also fail if:
[EINVAL] | |
The timeout argument specified a tv_nsec value less than zero or greater than or equal to 1000 million. Kernel only checks for this error if no signal is pending in set and it is necessary to wait. | |
SIGTIMEDWAIT (2) | September 27, 2012 |
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