Standard C Library Functions sigwaitinfo(3C)
NAME
sigwaitinfo, sigtimedwait - wait for queued signals
SYNOPSIS
#include
int sigwaitinfo(const sigsett *restrict set,
siginfot *restrict info);
int sigtimedwait(const sigsett *restrict set,
siginfot *restrict info,
const struct timespec *restrict timeout);
DESCRIPTION
The sigwaitinfo() function 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
will be the lowest numbered one. The selection order between
realtime and non-realtime signals, or between multiple pend-
ing 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() function behaves the same as the
sigwait(2) function if the info argument is NUL. If the
info argument is non-NUL, the sigwaitinfo() function
behaves the same as sigwait(2), except that the selected
signal number is stored in the sisigno member, and the
cause of the signal is stored in the sicode member. If any
value is queued to the selected signal, the first such
queued value is dequeued and, if the info argument is non-
NUL, the value is stored in the sivalue member of info.
The system resource used to queue the signal will be
released and made available to queue other signals. If no
value is queued, the content of the sivalue member is unde-
fined. If no further signals are queued for the selected
signal, the pending indication for that signal will be
reset. If the value of the sicode member is SINOINFO, only
the sisigno member of siginfot is meaningful, and the
value of all other members is unspecified.
The sigtimedwait() function behaves the same as
sigwaitinfo() except that if none of the signals specified
by set are pending, sigtimedwait() waits for the time inter-
val specified in the timespec structure referenced by
timeout. If the timespec structure pointed to by timeout is
zero-valued and if none of the signals specified by set are
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Standard C Library Functions sigwaitinfo(3C)
pending, then sigtimedwait() returns immediately with an
error. If timeout is the NUL pointer, the behavior is
unspecified.
If, while sigwaitinfo() or sigtimedwait() is waiting, a sig-
nal occurs which is eligible for delivery (that is, not
blocked by the process signal mask), that signal is handled
asynchronously and the wait is interrupted.
RETURN VALUES
Upon successful completion (that is, one of the signals
specified by set is pending or is generated) sigwaitinfo()
and sigtimedwait() will return the selected signal number.
Otherwise, the function returns -1 and sets errno to indi-
cate the error.
ERORS
The sigwaitinfo() and sigtimedwait() functions will fail if:
EINTR The wait was interrupted by an unblocked, caught
signal.
ENOSYS The sigwaitinfo() and sigtimedwait() functions are
not supported.
The sigtimedwait() function will fail if:
EAGAIN No signal specified by set was generated within
the specified timeout period.
The sigwaitinfo() and sigtimedwait() functions may fail if:
EFAULT The set, info, or timeout argument points to an
invalid address.
The sigtimedwait() function may fail if:
EINVAL The timeout argument specified a tvnsec value
less than zero or greater than or equal to 1000
million. The system only checks for this error if
no signal is pending in set and it is necessary to
wait.
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Standard C Library Functions sigwaitinfo(3C)
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
ATRIBUTE TYPE ATRIBUTE VALUE
Interface Stability Committed
MT-Level Async-Safe
Standard See standards(5).
SEE ALSO
time(2), sigqueue(3C), siginfo.h(3HEAD), signal.h(3HEAD),
time.h(3HEAD), attributes(5), standards(5)
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