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All Rights Reserved. .\" Copyright (c) 2008, Sun Microsystems, Inc. All Rights Reserved. .\" .TH SIGWAITINFO 3C "Feb 5, 2008" .SH NAME sigwaitinfo, sigtimedwait \- wait for queued signals .SH SYNOPSIS .LP .nf #include \fBint\fR \fBsigwaitinfo\fR(\fBconst sigset_t *restrict\fR \fIset\fR, \fBsiginfo_t *restrict\fR \fIinfo\fR); .fi .LP .nf \fBint\fR \fBsigtimedwait\fR(\fBconst sigset_t *restrict\fR \fIset\fR, \fBsiginfo_t *restrict\fR \fIinfo\fR, \fBconst struct timespec *restrict\fR \fItimeout\fR); .fi .SH DESCRIPTION .sp .LP The \fBsigwaitinfo()\fR function selects the pending signal from the set specified by \fBset\fR. Should any of multiple pending signals in the range \fBSIGRTMIN\fR to \fBSIGRTMAX\fR be selected, it will 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 \fBset\fR is pending at the time of the call, the calling thread is suspended until one or more signals in \fBset\fR become pending or until it is interrupted by an unblocked, caught signal. .sp .LP The \fBsigwaitinfo()\fR function behaves the same as the \fBsigwait\fR(2) function if the \fIinfo\fR argument is \fINULL\fR. If the \fIinfo\fR argument is non-\fINULL\fR, the \fBsigwaitinfo()\fR function behaves the same as \fBsigwait\fR(2), except that the selected signal number is stored in the \fIsi_signo\fR member, and the cause of the signal is stored in the \fIsi_code\fR member. If any value is queued to the selected signal, the first such queued value is dequeued and, if the \fIinfo\fR argument is non-\fINULL\fR, the value is stored in the \fIsi_value\fR member of \fIinfo\fR. 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 \fIsi_value\fR member is undefined. If no further signals are queued for the selected signal, the pending indication for that signal will be reset. If the value of the \fBsi_code\fR member is \fBSI_NOINFO\fR, only the \fBsi_signo\fR member of \fBsiginfo_t\fR is meaningful, and the value of all other members is unspecified. .sp .LP The \fBsigtimedwait()\fR function behaves the same as \fBsigwaitinfo()\fR except that if none of the signals specified by \fBset\fR are pending, \fBsigtimedwait()\fR waits for the time interval specified in the \fBtimespec\fR structure referenced by \fItimeout\fR. If the \fBtimespec\fR structure pointed to by \fItimeout\fR is zero-valued and if none of the signals specified by \fBset\fR are pending, then \fBsigtimedwait()\fR returns immediately with an error. If \fItimeout\fR is the \fINULL\fR pointer, the behavior is unspecified. .sp .LP If, while \fBsigwaitinfo()\fR or \fBsigtimedwait()\fR is waiting, a signal 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. .SH RETURN VALUES .sp .LP Upon successful completion (that is, one of the signals specified by \fIset\fR is pending or is generated) \fBsigwaitinfo()\fR and \fBsigtimedwait()\fR will return the selected signal number. Otherwise, the function returns \fB\(mi1\fR and sets \fBerrno\fR to indicate the error. .SH ERRORS .sp .LP The \fBsigwaitinfo()\fR and \fBsigtimedwait()\fR functions will fail if: .sp .ne 2 .na \fB\fBEINTR\fR\fR .ad .RS 10n The wait was interrupted by an unblocked, caught signal. .RE .sp .ne 2 .na \fB\fBENOSYS\fR\fR .ad .RS 10n The \fBsigwaitinfo()\fR and \fBsigtimedwait()\fR functions are not supported. .RE .sp .LP The \fBsigtimedwait()\fR function will fail if: .sp .ne 2 .na \fB\fBEAGAIN\fR\fR .ad .RS 10n No signal specified by \fBset\fR was generated within the specified timeout period. .RE .sp .LP The \fBsigwaitinfo()\fR and \fBsigtimedwait()\fR functions may fail if: .sp .ne 2 .na \fB\fBEFAULT\fR\fR .ad .RS 10n The \fIset\fR, \fIinfo\fR, or \fItimeout\fR argument points to an invalid address. .RE .sp .LP The \fBsigtimedwait()\fR function may fail if: .sp .ne 2 .na \fB\fBEINVAL\fR\fR .ad .RS 10n The \fItimeout\fR argument specified a \fBtv_nsec\fR 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 \fIset\fR and it is necessary to wait. .RE .SH ATTRIBUTES .sp .LP See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Committed _ MT-Level Async-Safe _ Standard See \fBstandards\fR(5). .TE .SH SEE ALSO .sp .LP \fBtime\fR(2), \fBsigqueue\fR(3C), \fBsiginfo.h\fR(3HEAD), \fBsignal.h\fR(3HEAD), \fBtime.h\fR(3HEAD), \fBattributes\fR(5), \fBstandards\fR(5)