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-.\" Copyright (C) 2006, 2010 Michael Kerrisk <mtk.manpages@gmail.com>
-.\" Copyright (C) 2009 Petr Baudis <pasky@suse.cz>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH sigevent 7 2022-10-30 "Linux man-pages 6.05.01"
-.SH NAME
-sigevent \- structure for notification from asynchronous routines
-.SH SYNOPSIS
-.nf
-#include <signal.h>
-.PP
-union sigval {            /* Data passed with notification */
-    int     sival_int;    /* Integer value */
-    void   *sival_ptr;    /* Pointer value */
-};
-.PP
-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); Linux-specific */
-};
-.fi
-.SH DESCRIPTION
-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 employ only 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
-.B SIGEV_NONE
-A "null" notification: don't do anything when the event occurs.
-.TP
-.B 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
-.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
-.B 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 SEE ALSO
-.BR timer_create (2),
-.BR aio_fsync (3),
-.BR aio_read (3),
-.BR aio_write (3),
-.BR getaddrinfo_a (3),
-.BR lio_listio (3),
-.BR mq_notify (3),
-.BR aio (7),
-.BR pthreads (7)