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+.\" Copyright (C) 2006, 2010 Michael Kerrisk <mtk.manpages@gmail.com>
+.\" Copyright (C) 2009 Petr Baudis <pasky@suse.cz>
+.\"
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of this
+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\"
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
+.\" the use of the information contained herein.  The author(s) may not
+.\" have taken the same level of care in the production of this manual,
+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\"
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\"
+.TH SIGEVENT 7 2010-09-19 "GNU" "Linux Programmer's Manual"
+.SH NAME
+struct sigevent \- structure for notification from asynchronous routines
+.SH SYNOPSIS
+.nf
+
+union sigval {          /* Data passed with notification */
+    int     sival_int;         /* Integer value */
+    void   *sival_ptr;         /* Pointer value */
+};
+
+struct sigevent {
+    int          sigev_notify; /* Notification method */
+    int          sigev_signo;  /* Notification signal */
+    union sigval sigev_value;  /* Data passed with
+                                  notification */
+    void       (*sigev_notify_function) (union sigval);
+                     /* Function used for thread
+                        notification (SIGEV_THREAD) */
+    void        *sigev_notify_attributes;
+                     /* Attributes for notification thread
+                        (SIGEV_THREAD) */
+    pid_t        sigev_notify_thread_id;
+                     /* ID of thread to signal (SIGEV_THREAD_ID) */
+};
+.fi
+.SH DESCRIPTION
+.PP
+The
+.I sigevent
+structure is used by various APIs
+to describe the way a process is to be notified about an event
+(e.g., completion of an asynchronous request, expiration of a timer,
+or the arrival of a message).
+.PP
+The definition shown in the SYNOPSIS is approximate:
+some of the fields in the
+.I sigevent
+structure may be defined as part of a union.
+Programs should only employ those fields relevant
+to the value specified in
+.IR sigev_notify .
+.PP
+The
+.I sigev_notify
+field specifies how notification is to be performed.
+This field can have one of the following values:
+.TP 8
+.BR SIGEV_NONE
+A "null" notification: don't do anything when the event occurs.
+.TP
+.BR SIGEV_SIGNAL
+Notify the process by sending the signal specified in
+.IR sigev_signo .
+.IP
+If the signal is caught with a signal handler that was registered using the
+.BR sigaction (2)
+.B SA_SIGINFO
+flag, then the following fields are set in the
+.I siginfo_t
+structure that is passed as the second argument of the handler:
+.RS 8
+.TP 10
+.I si_code
+This field is set to a value that depends on the API
+delivering the notification.
+.TP
+.I si_signo
+This field is set to the signal number (i.e., the same value as in 
+.IR sigev_signo ).
+.TP
+.I si_value
+This field is set to the value specified in
+.IR sigev_value .
+.RE
+.IP
+Depending on the API, other fields may also be set in the
+.I siginfo_t
+structure.
+.IP
+The same information is also available if the signal is accepted using
+.BR sigwaitinfo (2).
+.TP
+.BR SIGEV_THREAD
+Notify the process by invoking
+.I sigev_notify_function
+"as if" it were the start function of a new thread.
+(Among the implementation possibilities here are that
+each timer notification could result in the creation of a new thread,
+or that a single thread is created to receive all notifications.)
+The function is invoked with
+.I sigev_value
+as its sole argument.
+If
+.I sigev_notify_attributes
+is not NULL, it should point to a
+.I pthread_attr_t
+structure that defines attributes for the new thread (see
+.BR pthread_attr_init (3)).
+.TP
+.BR SIGEV_THREAD_ID " (Linux-specific)"
+.\" | SIGEV_SIGNAL vs not?
+Currently used only by POSIX timers; see
+.BR timer_create (2).
+.SH CONFORMING TO
+POSIX.1-2001.
+.SH "SEE ALSO"
+.BR timer_create (2),
+.BR aio_fsync (3),
+.\" .BR lio_listio (3),
+.\" FIXME This page will be added later .BR getaddrinfo_a (3),
+.BR mq_notify (3),
+.BR pthreads (7)